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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | $ 667,544,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 146,965,000 |  |
Buildings & Improvements |  |  |  |  | 1,349,531,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 229,692,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 167,129,000 |  |
Buildings & Improvements |  |  |  |  | 1,559,059,000 |  |
Total |  | $ 1,726,189,000 |  |  | 1,726,189,000 |  |
Accumulated Depreciation |  | $ (313,308,000) |  |  | (313,308,000) |  |
Maximum borrowing capacity |  |  |  |  | 90,000,000 |  |
Advances under the facility specified as percentage of value of properties provided as security (in hundredths) |  | 60.00% |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,726,189,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 313,308,000 |  |  |  |  |
Total real estate investments | [2] |  |  |  | 1,412,880,000 | $ 1,275,284,000 | $ 1,214,235,000
Net basis of real estate investments for federal income tax purposes |  |  |  |  | 1,700,000,000 | 1,500,000,000 | 1,500,000,000
Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 90,000,000 |  |
Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 100,000,000 |  |
Discontinued Operations [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 295,678,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 76,228,000 |  |
Buildings & Improvements |  |  |  |  | 405,130,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 70,311,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 80,424,000 |  |
Buildings & Improvements |  |  |  |  | 471,245,000 |  |
Total |  | 551,669,000 |  |  | 551,669,000 |  |
Accumulated Depreciation |  | (135,679,000) |  |  | (135,679,000) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 551,669,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 135,679,000 |  |  |  |  |
Discontinued Operations [Member] | 610 Business Center IV - Brooklyn Park, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 6,759,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 975,000 |  |
Buildings & Improvements |  |  |  |  | 5,542,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,886,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 980,000 |  |
Buildings & Improvements |  |  |  |  | 8,423,000 |  |
Total |  | 9,403,000 |  |  | 9,403,000 |  |
Accumulated Depreciation |  | $ (2,408,000) |  |  | (2,408,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,403,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,408,000 |  |  |  |  |
Discontinued Operations [Member] | 7800 West Brown Deer Road - Milwaukee, WI [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 10,320,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,455,000 |  |
Buildings & Improvements |  |  |  |  | 8,756,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,431,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,475,000 |  |
Buildings & Improvements |  |  |  |  | 11,167,000 |  |
Total |  | 12,642,000 |  |  | 12,642,000 |  |
Accumulated Depreciation |  | $ (4,022,000) |  |  | (4,022,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 12,642,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,022,000 |  |  |  |  |
Discontinued Operations [Member] | American Corporate Center - Mendota Heights, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 8,670,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 893,000 |  |
Buildings & Improvements |  |  |  |  | 16,768,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,067,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 893,000 |  |
Buildings & Improvements |  |  |  |  | 20,835,000 |  |
Total |  | 21,728,000 |  |  | 21,728,000 |  |
Accumulated Depreciation |  | $ (8,926,000) |  |  | (8,926,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 21,728,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 8,926,000 |  |  |  |  |
Discontinued Operations [Member] | Ameritrade - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 2,020,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 327,000 |  |
Buildings & Improvements |  |  |  |  | 7,957,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 65,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 327,000 |  |
Buildings & Improvements |  |  |  |  | 8,022,000 |  |
Total |  | 8,349,000 |  |  | 8,349,000 |  |
Accumulated Depreciation |  | $ (3,215,000) |  |  | (3,215,000) |  |
Date of Construction or Acquisition |  | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,349,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,215,000 |  |  |  |  |
Discontinued Operations [Member] | Benton Business Park - Sauk Rapids, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 188,000 |  |
Buildings & Improvements |  |  |  |  | 1,261,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 87,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 188,000 |  |
Buildings & Improvements |  |  |  |  | 1,348,000 |  |
Total |  | 1,536,000 |  |  | 1,536,000 |  |
Accumulated Depreciation |  | $ (429,000) |  |  | (429,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,536,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 429,000 |  |  |  |  |
Discontinued Operations [Member] | Brenwood - Minnetonka, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,642,000 |  |
Buildings & Improvements |  |  |  |  | 12,138,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,864,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,650,000 |  |
Buildings & Improvements |  |  |  |  | 15,994,000 |  |
Total |  | 17,644,000 |  |  | 17,644,000 |  |
Accumulated Depreciation |  | $ (5,810,000) |  |  | (5,810,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 17,644,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 5,810,000 |  |  |  |  |
Discontinued Operations [Member] | Brook Valley I - La Vista, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 1,209,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 347,000 |  |
Buildings & Improvements |  |  |  |  | 1,671,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 134,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 347,000 |  |
Buildings & Improvements |  |  |  |  | 1,805,000 |  |
Total |  | 2,152,000 |  |  | 2,152,000 |  |
Accumulated Depreciation |  | $ (458,000) |  |  | (458,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,152,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 458,000 |  |  |  |  |
Discontinued Operations [Member] | Corporate Center West - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 17,315,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,880,000 |  |
Buildings & Improvements |  |  |  |  | 5,253,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 21,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,880,000 |  |
Buildings & Improvements |  |  |  |  | 5,274,000 |  |
Total |  | 9,154,000 |  |  | 9,154,000 |  |
Accumulated Depreciation |  | $ (126,000) |  |  | (126,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,154,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 126,000 |  |  |  |  |
Discontinued Operations [Member] | Crosstown Centre - Eden Prairie, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 9,000,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,884,000 |  |
Buildings & Improvements |  |  |  |  | 14,569,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,183,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,980,000 |  |
Buildings & Improvements |  |  |  |  | 17,656,000 |  |
Total |  | 20,636,000 |  |  | 20,636,000 |  |
Accumulated Depreciation |  | $ (4,939,000) |  |  | (4,939,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 20,636,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,939,000 |  |  |  |  |
Discontinued Operations [Member] | Eden Prairie 6101 Blue Circle Dr - Eden Prairie [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 666,000 |  |
Buildings & Improvements |  |  |  |  | 4,197,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 666,000 |  |
Buildings & Improvements |  |  |  |  | 4,198,000 |  |
Total |  | 4,864,000 |  |  | 4,864,000 |  |
Accumulated Depreciation |  | $ (1,701,000) |  |  | (1,701,000) |  |
Date of Construction or Acquisition |  | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 4,864,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,701,000 |  |  |  |  |
Discontinued Operations [Member] | Farnam Executive Center - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 12,160,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,188,000 |  |
Buildings & Improvements |  |  |  |  | 7,912,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,188,000 |  |
Buildings & Improvements |  |  |  |  | 7,913,000 |  |
Total |  | 10,101,000 |  |  | 10,101,000 |  |
Accumulated Depreciation |  | $ (190,000) |  |  | (190,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 10,101,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 190,000 |  |  |  |  |
Discontinued Operations [Member] | Flagship - Eden Prairie, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 21,565,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,899,000 |  |
Buildings & Improvements |  |  |  |  | 15,518,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 31,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,913,000 |  |
Buildings & Improvements |  |  |  |  | 15,535,000 |  |
Total |  | 17,448,000 |  |  | 17,448,000 |  |
Accumulated Depreciation |  | $ (373,000) |  |  | (373,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 17,448,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 373,000 |  |  |  |  |
Discontinued Operations [Member] | Gateway Corporate Center - Woodbury, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 8,700,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,637,000 |  |
Buildings & Improvements |  |  |  |  | 6,663,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,637,000 |  |
Buildings & Improvements |  |  |  |  | 6,663,000 |  |
Total |  | 8,300,000 |  |  | 8,300,000 |  |
Accumulated Depreciation |  | $ (160,000) |  |  | (160,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,300,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 160,000 |  |  |  |  |
Discontinued Operations [Member] | Golden Hills Office Center - Golden Valley, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 17,417,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,018,000 |  |
Buildings & Improvements |  |  |  |  | 18,544,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,313,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,018,000 |  |
Buildings & Improvements |  |  |  |  | 22,857,000 |  |
Total |  | 25,875,000 |  |  | 25,875,000 |  |
Accumulated Depreciation |  | $ (8,851,000) |  |  | (8,851,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 25,875,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 8,851,000 |  |  |  |  |
Discontinued Operations [Member] | Granite Corporate Center - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 5,313,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 588,000 |  |
Buildings & Improvements |  |  |  |  | 7,808,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,521,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 740,000 |  |
Buildings & Improvements |  |  |  |  | 9,177,000 |  |
Total |  | 9,917,000 |  |  | 9,917,000 |  |
Accumulated Depreciation |  | $ (3,524,000) |  |  | (3,524,000) |  |
Date of Construction or Acquisition |  | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,917,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,524,000 |  |  |  |  |
Discontinued Operations [Member] | Great Plains - Fargo, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 126,000 |  |
Buildings & Improvements |  |  |  |  | 15,240,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 721,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 126,000 |  |
Buildings & Improvements |  |  |  |  | 15,961,000 |  |
Total |  | 16,087,000 |  |  | 16,087,000 |  |
Accumulated Depreciation |  | $ (6,161,000) |  |  | (6,161,000) |  |
Date of Construction or Acquisition |  | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 16,087,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 6,161,000 |  |  |  |  |
Discontinued Operations [Member] | Highlands Ranch I - Highlands Ranch, CO [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,268,000 |  |
Buildings & Improvements |  |  |  |  | 8,362,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,117,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,268,000 |  |
Buildings & Improvements |  |  |  |  | 9,479,000 |  |
Total |  | 11,747,000 |  |  | 11,747,000 |  |
Accumulated Depreciation |  | $ (2,211,000) |  |  | (2,211,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 11,747,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,211,000 |  |  |  |  |
Discontinued Operations [Member] | Highlands Ranch II - Highlands Ranch, CO [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,437,000 |  |
Buildings & Improvements |  |  |  |  | 9,549,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,901,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,437,000 |  |
Buildings & Improvements |  |  |  |  | 11,450,000 |  |
Total |  | 12,887,000 |  |  | 12,887,000 |  |
Accumulated Depreciation |  | $ (3,391,000) |  |  | (3,391,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 12,887,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,391,000 |  |  |  |  |
Discontinued Operations [Member] | Interlachen Corporate Center - Edina, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 8,800,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,650,000 |  |
Buildings & Improvements |  |  |  |  | 14,983,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,530,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,693,000 |  |
Buildings & Improvements |  |  |  |  | 17,470,000 |  |
Total |  | 19,163,000 |  |  | 19,163,000 |  |
Accumulated Depreciation |  | $ (6,389,000) |  |  | (6,389,000) |  |
Date of Construction or Acquisition |  | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 19,163,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 6,389,000 |  |  |  |  |
Discontinued Operations [Member] | Intertech Building - Fenton, MO [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 4,177,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,130,000 |  |
Buildings & Improvements |  |  |  |  | 3,968,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,721,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,191,000 |  |
Buildings & Improvements |  |  |  |  | 5,628,000 |  |
Total |  | 7,819,000 |  |  | 7,819,000 |  |
Accumulated Depreciation |  | $ (1,253,000) |  |  | (1,253,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,819,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,253,000 |  |  |  |  |
Discontinued Operations [Member] | Mendota Office Center I - Mendota Heights, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,734,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 835,000 |  |
Buildings & Improvements |  |  |  |  | 6,169,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,402,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 835,000 |  |
Buildings & Improvements |  |  |  |  | 7,571,000 |  |
Total |  | 8,406,000 |  |  | 8,406,000 |  |
Accumulated Depreciation |  | $ (2,683,000) |  |  | (2,683,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,406,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,683,000 |  |  |  |  |
Discontinued Operations [Member] | Mendota Office Center II - Mendota Heights, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 5,516,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,121,000 |  |
Buildings & Improvements |  |  |  |  | 10,085,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,097,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,121,000 |  |
Buildings & Improvements |  |  |  |  | 12,182,000 |  |
Total |  | 13,303,000 |  |  | 13,303,000 |  |
Accumulated Depreciation |  | $ (4,882,000) |  |  | (4,882,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 13,303,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,882,000 |  |  |  |  |
Discontinued Operations [Member] | Mendota Office Center III - Mendota Heights, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,791,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 970,000 |  |
Buildings & Improvements |  |  |  |  | 5,734,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 957,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 970,000 |  |
Buildings & Improvements |  |  |  |  | 6,691,000 |  |
Total |  | 7,661,000 |  |  | 7,661,000 |  |
Accumulated Depreciation |  | $ (2,419,000) |  |  | (2,419,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,661,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,419,000 |  |  |  |  |
Discontinued Operations [Member] | Mendota Office Center IV - Mendota Heights, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 4,507,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,070,000 |  |
Buildings & Improvements |  |  |  |  | 7,635,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,510,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,070,000 |  |
Buildings & Improvements |  |  |  |  | 9,145,000 |  |
Total |  | 10,215,000 |  |  | 10,215,000 |  |
Accumulated Depreciation |  | $ (3,235,000) |  |  | (3,235,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 10,215,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,235,000 |  |  |  |  |
Discontinued Operations [Member] | Minnesota National Bank - Duluth, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 628,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 287,000 |  |
Buildings & Improvements |  |  |  |  | 1,454,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 224,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 288,000 |  |
Buildings & Improvements |  |  |  |  | 1,677,000 |  |
Total |  | 1,965,000 |  |  | 1,965,000 |  |
Accumulated Depreciation |  | $ (475,000) |  |  | (475,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,965,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 475,000 |  |  |  |  |
Discontinued Operations [Member] | Miracle Hills One - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 8,895,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,974,000 |  |
Buildings & Improvements |  |  |  |  | 5,726,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 6,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,974,000 |  |
Buildings & Improvements |  |  |  |  | 5,732,000 |  |
Total |  | 7,706,000 |  |  | 7,706,000 |  |
Accumulated Depreciation |  | $ (139,000) |  |  | (139,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,706,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 139,000 |  |  |  |  |
Discontinued Operations [Member] | Northpark Corporate Center - Arden Hills, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 11,519,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,034,000 |  |
Buildings & Improvements |  |  |  |  | 14,584,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,497,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,037,000 |  |
Buildings & Improvements |  |  |  |  | 17,078,000 |  |
Total |  | 19,115,000 |  |  | 19,115,000 |  |
Accumulated Depreciation |  | $ (4,231,000) |  |  | (4,231,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 19,115,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,231,000 |  |  |  |  |
Discontinued Operations [Member] | Omaha 10802 Farnam Dr - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 5,061,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,462,000 |  |
Buildings & Improvements |  |  |  |  | 4,374,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 392,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,818,000 |  |
Buildings & Improvements |  |  |  |  | 4,410,000 |  |
Total |  | 7,228,000 |  |  | 7,228,000 |  |
Accumulated Depreciation |  | $ (525,000) |  |  | (525,000) |  |
Date of Construction or Acquisition |  | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,228,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 525,000 |  |  |  |  |
Discontinued Operations [Member] | Pacific Hills - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 16,770,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 4,220,000 |  |
Buildings & Improvements |  |  |  |  | 6,280,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 243,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 4,220,000 |  |
Buildings & Improvements |  |  |  |  | 6,523,000 |  |
Total |  | 10,743,000 |  |  | 10,743,000 |  |
Accumulated Depreciation |  | $ (180,000) |  |  | (180,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 10,743,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 180,000 |  |  |  |  |
Discontinued Operations [Member] | Plaza VII - Boise, ID [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 300,000 |  |
Buildings & Improvements |  |  |  |  | 913,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 300,000 |  |
Buildings & Improvements |  |  |  |  | 917,000 |  |
Total |  | 1,217,000 |  |  | 1,217,000 |  |
Accumulated Depreciation |  | $ (11,000) |  |  | (11,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,217,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 11,000 |  |  |  |  |
Discontinued Operations [Member] | Plymouth 5095 Nathan Lane - Plymouth, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 1,147,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 604,000 |  |
Buildings & Improvements |  |  |  |  | 1,253,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 87,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 636,000 |  |
Buildings & Improvements |  |  |  |  | 1,308,000 |  |
Total |  | 1,944,000 |  |  | 1,944,000 |  |
Accumulated Depreciation |  | $ (258,000) |  |  | (258,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,944,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 258,000 |  |  |  |  |
Discontinued Operations [Member] | Prairie Oak Business Center - Eden Prairie, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,120,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 531,000 |  |
Buildings & Improvements |  |  |  |  | 4,069,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,523,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,030,000 |  |
Buildings & Improvements |  |  |  |  | 6,093,000 |  |
Total |  | 7,123,000 |  |  | 7,123,000 |  |
Accumulated Depreciation |  | $ (2,365,000) |  |  | (2,365,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,123,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,365,000 |  |  |  |  |
Discontinued Operations [Member] | Rapid City 900 Concourse Drive - Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 181,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 285,000 |  |
Buildings & Improvements |  |  |  |  | 6,600,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,151,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 514,000 |  |
Buildings & Improvements |  |  |  |  | 7,522,000 |  |
Total |  | 8,036,000 |  |  | 8,036,000 |  |
Accumulated Depreciation |  | $ (2,912,000) |  |  | (2,912,000) |  |
Date of Construction or Acquisition |  | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,036,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,912,000 |  |  |  |  |
Discontinued Operations [Member] | Riverport - Maryland Heights, MO [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 19,690,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,891,000 |  |
Buildings & Improvements |  |  |  |  | 6,109,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,891,000 |  |
Buildings & Improvements |  |  |  |  | 6,109,000 |  |
Total |  | 8,000,000 |  |  | 8,000,000 |  |
Accumulated Depreciation |  | $ (146,000) |  |  | (146,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,000,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 146,000 |  |  |  |  |
Discontinued Operations [Member] | Spring Valley IV - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 720,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 178,000 |  |
Buildings & Improvements |  |  |  |  | 916,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 60,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 186,000 |  |
Buildings & Improvements |  |  |  |  | 968,000 |  |
Total |  | 1,154,000 |  |  | 1,154,000 |  |
Accumulated Depreciation |  | $ (259,000) |  |  | (259,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,154,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 259,000 |  |  |  |  |
Discontinued Operations [Member] | Spring Valley V - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 792,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 212,000 |  |
Buildings & Improvements |  |  |  |  | 1,123,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 251,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 240,000 |  |
Buildings & Improvements |  |  |  |  | 1,346,000 |  |
Total |  | 1,586,000 |  |  | 1,586,000 |  |
Accumulated Depreciation |  | $ (388,000) |  |  | (388,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,586,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 388,000 |  |  |  |  |
Discontinued Operations [Member] | Spring Valley X - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 734,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 180,000 |  |
Buildings & Improvements |  |  |  |  | 1,024,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 80,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 189,000 |  |
Buildings & Improvements |  |  |  |  | 1,095,000 |  |
Total |  | 1,284,000 |  |  | 1,284,000 |  |
Accumulated Depreciation |  | $ (282,000) |  |  | (282,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,284,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 282,000 |  |  |  |  |
Discontinued Operations [Member] | Spring Valley XI - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 720,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 143,000 |  |
Buildings & Improvements |  |  |  |  | 1,094,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 36,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 151,000 |  |
Buildings & Improvements |  |  |  |  | 1,122,000 |  |
Total |  | 1,273,000 |  |  | 1,273,000 |  |
Accumulated Depreciation |  | $ (276,000) |  |  | (276,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,273,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 276,000 |  |  |  |  |
Discontinued Operations [Member] | Superior Office Building - Duluth, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 944,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 336,000 |  |
Buildings & Improvements |  |  |  |  | 2,200,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 143,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 336,000 |  |
Buildings & Improvements |  |  |  |  | 2,343,000 |  |
Total |  | 2,679,000 |  |  | 2,679,000 |  |
Accumulated Depreciation |  | $ (688,000) |  |  | (688,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,679,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 688,000 |  |  |  |  |
Discontinued Operations [Member] | TCA Building - Eagan, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 7,500,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 627,000 |  |
Buildings & Improvements |  |  |  |  | 8,571,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 915,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 684,000 |  |
Buildings & Improvements |  |  |  |  | 9,429,000 |  |
Total |  | 10,113,000 |  |  | 10,113,000 |  |
Accumulated Depreciation |  | $ (2,767,000) |  |  | (2,767,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 10,113,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,767,000 |  |  |  |  |
Discontinued Operations [Member] | Three Paramount Plaza - Bloomington, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,261,000 |  |
Buildings & Improvements |  |  |  |  | 6,149,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,961,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,482,000 |  |
Buildings & Improvements |  |  |  |  | 7,889,000 |  |
Total |  | 9,371,000 |  |  | 9,371,000 |  |
Accumulated Depreciation |  | $ (3,085,000) |  |  | (3,085,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,371,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,085,000 |  |  |  |  |
Discontinued Operations [Member] | Timberlands - Leawood, KS [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 1,315,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,375,000 |  |
Buildings & Improvements |  |  |  |  | 9,601,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 189,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,375,000 |  |
Buildings & Improvements |  |  |  |  | 9,790,000 |  |
Total |  | 12,165,000 |  |  | 12,165,000 |  |
Accumulated Depreciation |  | $ (242,000) |  |  | (242,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 12,165,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 242,000 |  |  |  |  |
Discontinued Operations [Member] | UHC Office - International Falls, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 800,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 119,000 |  |
Buildings & Improvements |  |  |  |  | 2,366,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 230,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 119,000 |  |
Buildings & Improvements |  |  |  |  | 2,596,000 |  |
Total |  | 2,715,000 |  |  | 2,715,000 |  |
Accumulated Depreciation |  | $ (734,000) |  |  | (734,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,715,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 734,000 |  |  |  |  |
Discontinued Operations [Member] | US Bank Financial Center - Bloomington, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 12,766,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,117,000 |  |
Buildings & Improvements |  |  |  |  | 13,350,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,023,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,195,000 |  |
Buildings & Improvements |  |  |  |  | 15,295,000 |  |
Total |  | 18,490,000 |  |  | 18,490,000 |  |
Accumulated Depreciation |  | $ (3,805,000) |  |  | (3,805,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 18,490,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,805,000 |  |  |  |  |
Discontinued Operations [Member] | Wells Fargo Center - St Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 5,787,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 869,000 |  |
Buildings & Improvements |  |  |  |  | 8,373,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,956,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 884,000 |  |
Buildings & Improvements |  |  |  |  | 10,314,000 |  |
Total |  | 11,198,000 |  |  | 11,198,000 |  |
Accumulated Depreciation |  | $ (2,641,000) |  |  | (2,641,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 11,198,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,641,000 |  |  |  |  |
Discontinued Operations [Member] | West River Business Park - Waite Park, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 235,000 |  |
Buildings & Improvements |  |  |  |  | 1,195,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 267,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 235,000 |  |
Buildings & Improvements |  |  |  |  | 1,462,000 |  |
Total |  | 1,697,000 |  |  | 1,697,000 |  |
Accumulated Depreciation |  | $ (430,000) |  |  | (430,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,697,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 430,000 |  |  |  |  |
Discontinued Operations [Member] | Westgate - Boise, ID [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,844,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,000,000 |  |
Buildings & Improvements |  |  |  |  | 10,618,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,933,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,000,000 |  |
Buildings & Improvements |  |  |  |  | 12,551,000 |  |
Total |  | 13,551,000 |  |  | 13,551,000 |  |
Accumulated Depreciation |  | $ (4,512,000) |  |  | (4,512,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 13,551,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,512,000 |  |  |  |  |
Discontinued Operations [Member] | Woodlands Plaza IV - Maryland Heights, MO [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 4,360,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 771,000 |  |
Buildings & Improvements |  |  |  |  | 4,609,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,461,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 862,000 |  |
Buildings & Improvements |  |  |  |  | 5,979,000 |  |
Total |  | 6,841,000 |  |  | 6,841,000 |  |
Accumulated Depreciation |  | $ (1,501,000) |  |  | (1,501,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 6,841,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,501,000 |  |  |  |  |
Discontinued Operations [Member] | Barry Pointe Office Park - Kansas City, MO [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 1,369,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 384,000 |  |
Buildings & Improvements |  |  |  |  | 2,366,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 226,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 392,000 |  |
Buildings & Improvements |  |  |  |  | 2,584,000 |  |
Total |  | 2,976,000 |  |  | 2,976,000 |  |
Accumulated Depreciation |  | $ (547,000) |  |  | (547,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,976,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 547,000 |  |  |  |  |
Discontinued Operations [Member] | Burnsville 1 Strip Center - Burnsville, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 208,000 |  |
Buildings & Improvements |  |  |  |  | 773,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 200,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 208,000 |  |
Buildings & Improvements |  |  |  |  | 973,000 |  |
Total |  | 1,181,000 |  |  | 1,181,000 |  |
Accumulated Depreciation |  | $ (306,000) |  |  | (306,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,181,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 306,000 |  |  |  |  |
Discontinued Operations [Member] | Champlin South Pond - Champlin, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 1,185,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 842,000 |  |
Buildings & Improvements |  |  |  |  | 2,703,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 105,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 866,000 |  |
Buildings & Improvements |  |  |  |  | 2,784,000 |  |
Total |  | 3,650,000 |  |  | 3,650,000 |  |
Accumulated Depreciation |  | $ (797,000) |  |  | (797,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,650,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 797,000 |  |  |  |  |
Discontinued Operations [Member] | Chan West Village - Chanhassen, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 12,307,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 5,035,000 |  |
Buildings & Improvements |  |  |  |  | 14,665,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,079,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 5,679,000 |  |
Buildings & Improvements |  |  |  |  | 16,100,000 |  |
Total |  | 21,779,000 |  |  | 21,779,000 |  |
Accumulated Depreciation |  | $ (5,215,000) |  |  | (5,215,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 21,779,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 5,215,000 |  |  |  |  |
Discontinued Operations [Member] | Duluth 4615 Grand - Duluth, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 544,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 130,000 |  |
Buildings & Improvements |  |  |  |  | 1,800,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 156,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 131,000 |  |
Buildings & Improvements |  |  |  |  | 1,955,000 |  |
Total |  | 2,086,000 |  |  | 2,086,000 |  |
Accumulated Depreciation |  | $ (499,000) |  |  | (499,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,086,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 499,000 |  |  |  |  |
Discontinued Operations [Member] | Duluth Denfeld Retail - Duluth, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 1,798,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 276,000 |  |
Buildings & Improvements |  |  |  |  | 4,699,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 185,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 297,000 |  |
Buildings & Improvements |  |  |  |  | 4,863,000 |  |
Total |  | 5,160,000 |  |  | 5,160,000 |  |
Accumulated Depreciation |  | $ (1,380,000) |  |  | (1,380,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,160,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,380,000 |  |  |  |  |
Discontinued Operations [Member] | Forest Lake Auto - Forest Lake, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 50,000 |  |
Buildings & Improvements |  |  |  |  | 446,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 13,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 50,000 |  |
Buildings & Improvements |  |  |  |  | 459,000 |  |
Total |  | 509,000 |  |  | 509,000 |  |
Accumulated Depreciation |  | $ (143,000) |  |  | (143,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 509,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 143,000 |  |  |  |  |
Discontinued Operations [Member] | Forest Lake Westlake Center - Forest Lake, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,446,000 |  |
Buildings & Improvements |  |  |  |  | 5,304,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,747,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,480,000 |  |
Buildings & Improvements |  |  |  |  | 7,017,000 |  |
Total |  | 9,497,000 |  |  | 9,497,000 |  |
Accumulated Depreciation |  | $ (1,830,000) |  |  | (1,830,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,497,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,830,000 |  |  |  |  |
Discontinued Operations [Member] | Grand Forks Medpark Mall - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 681,000 |  |
Buildings & Improvements |  |  |  |  | 4,808,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 231,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 722,000 |  |
Buildings & Improvements |  |  |  |  | 4,998,000 |  |
Total |  | 5,720,000 |  |  | 5,720,000 |  |
Accumulated Depreciation |  | $ (1,924,000) |  |  | (1,924,000) |  |
Date of Construction or Acquisition |  | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,720,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,924,000 |  |  |  |  |
Discontinued Operations [Member] | Jamestown Buffalo Mall - Jamestown, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 1,717,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 566,000 |  |
Buildings & Improvements |  |  |  |  | 5,551,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,975,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,114,000 |  |
Buildings & Improvements |  |  |  |  | 7,978,000 |  |
Total |  | 9,092,000 |  |  | 9,092,000 |  |
Accumulated Depreciation |  | $ (1,996,000) |  |  | (1,996,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,092,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,996,000 |  |  |  |  |
Discontinued Operations [Member] | Jamestown Business Center - Jamestown, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 327,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 297,000 |  |
Buildings & Improvements |  |  |  |  | 1,023,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,312,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 333,000 |  |
Buildings & Improvements |  |  |  |  | 2,299,000 |  |
Total |  | 2,632,000 |  |  | 2,632,000 |  |
Accumulated Depreciation |  | $ (965,000) |  |  | (965,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,632,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 965,000 |  |  |  |  |
Discontinued Operations [Member] | Lakeville Strip Center - Lakeville, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 46,000 |  |
Buildings & Improvements |  |  |  |  | 1,142,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 955,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 94,000 |  |
Buildings & Improvements |  |  |  |  | 2,049,000 |  |
Total |  | 2,143,000 |  |  | 2,143,000 |  |
Accumulated Depreciation |  | $ (726,000) |  |  | (726,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,143,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 726,000 |  |  |  |  |
Discontinued Operations [Member] | Monticello C Store - Monticello, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 65,000 |  |
Buildings & Improvements |  |  |  |  | 770,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 37,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 97,000 |  |
Buildings & Improvements |  |  |  |  | 775,000 |  |
Total |  | 872,000 |  |  | 872,000 |  |
Accumulated Depreciation |  | $ (247,000) |  |  | (247,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 872,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 247,000 |  |  |  |  |
Discontinued Operations [Member] | Omaha Barnes & Noble - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 600,000 |  |
Buildings & Improvements |  |  |  |  | 3,099,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 600,000 |  |
Buildings & Improvements |  |  |  |  | 3,099,000 |  |
Total |  | 3,699,000 |  |  | 3,699,000 |  |
Accumulated Depreciation |  | $ (1,511,000) |  |  | (1,511,000) |  |
Date of Construction or Acquisition |  | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,699,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,511,000 |  |  |  |  |
Discontinued Operations [Member] | Pine City C-Store - Pine City, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 83,000 |  |
Buildings & Improvements |  |  |  |  | 357,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 12,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 83,000 |  |
Buildings & Improvements |  |  |  |  | 369,000 |  |
Total |  | 452,000 |  |  | 452,000 |  |
Accumulated Depreciation |  | $ (118,000) |  |  | (118,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 452,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 118,000 |  |  |  |  |
Discontinued Operations [Member] | Pine City Evergreen Square - Pine City, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 154,000 |  |
Buildings & Improvements |  |  |  |  | 2,646,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,334,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 385,000 |  |
Buildings & Improvements |  |  |  |  | 3,749,000 |  |
Total |  | 4,134,000 |  |  | 4,134,000 |  |
Accumulated Depreciation |  | $ (1,104,000) |  |  | (1,104,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 4,134,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,104,000 |  |  |  |  |
Discontinued Operations [Member] | Rochester Maplewood Square - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 6,325,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,275,000 |  |
Buildings & Improvements |  |  |  |  | 8,610,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,155,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,652,000 |  |
Buildings & Improvements |  |  |  |  | 10,388,000 |  |
Total |  | 14,040,000 |  |  | 14,040,000 |  |
Accumulated Depreciation |  | $ (3,936,000) |  |  | (3,936,000) |  |
Date of Construction or Acquisition |  | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 14,040,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,936,000 |  |  |  |  |
Discontinued Operations [Member] | St. Cloud Westgate - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 885,000 |  |
Buildings & Improvements |  |  |  |  | 5,535,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,396,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,002,000 |  |
Buildings & Improvements |  |  |  |  | 6,814,000 |  |
Total |  | 7,816,000 |  |  | 7,816,000 |  |
Accumulated Depreciation |  | $ (1,827,000) |  |  | (1,827,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,816,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,827,000 |  |  |  |  |
Wholly Owned Properties [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Total |  | 1,450,216,000 | $ 1,450,216,000 | $ 1,303,393,000 | 1,546,367,000 | 1,450,216,000 | 1,435,574,000
Accumulated Depreciation |  | (302,405,000) | (302,405,000) | (258,809,000) | (313,308,000) | (302,405,000) | (289,624,000)
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at beginning of year |  | 1,450,216,000 | 1,435,574,000 | 1,303,393,000 |  |  |
Improvements and Other |  | 22,665,000 | 24,619,000 | 27,037,000 |  |  |
Total Additions |  | 1,668,218,000 | 1,562,315,000 | 1,462,551,000 |  |  |
Cost of real estate sold |  | (15,719,000) | (85,030,000) | (21,953,000) |  |  |
Impairment charge |  | (1,566,000) | (8,322,000) | (305,000) |  |  |
Write down of asset and accumulated depreciation on impaired assets |  | (881,000) | (6,291,000) | 0 |  |  |
Transfers |  | (97,824,000) | (10,307,000) | (1,893,000) |  |  |
Other | [3] | (5,861,000) | (2,149,000) | (2,826,000) |  |  |
Balance at close of year |  | 1,546,367,000 | 1,450,216,000 | 1,435,574,000 |  |  |
Reconciliations of accumulated depreciation/amortization [Abstract] |  |  |  |  |  |  |
Balance at beginning of year |  | 302,405,000 | 289,624,000 | 258,809,000 |  |  |
Additions during year [Abstract] |  |  |  |  |  |  |
Provisions for depreciation |  | 45,498,000 | 40,450,000 | 40,032,000 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Accumulated depreciation on real estate sold |  | (29,463,000) | (19,413,000) | (6,444,000) |  |  |
Write down of asset and accumulated depreciation on impaired assets |  | (881,000) | (6,291,000) | 0 |  |  |
Other | [3] | (4,251,000) | (1,965,000) | (2,773,000) |  |  |
Balance at close of year |  | 313,308,000 | 302,405,000 | 289,624,000 |  |  |
Development in Progress [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 11,789,000 |  |
Buildings & Improvements |  |  |  |  | 125,872,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 16,333,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 11,789,000 |  |
Buildings & Improvements |  |  |  |  | 142,205,000 |  |
Total |  | 153,994,000 | 104,609,000 | 27,599,000 | 153,994,000 | 104,609,000 | 46,782,000
Accumulated Depreciation |  | 0 |  |  | 0 |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at beginning of year |  | 104,609,000 | 46,782,000 | 27,599,000 |  |  |
Acquisitions |  | 12,647,000 | 2,079,000 | 9,177,000 |  |  |
Improvements and Other |  | 189,306,000 | 123,240,000 | 52,970,000 |  |  |
Involuntary conversion |  | 0 | (7,052,000) | 0 |  |  |
Transfers |  | 7,015,000 | 2,870,000 | 0 |  |  |
Development placed in service | [4] | (159,578,000) | (63,210,000) | (42,964,000) |  |  |
Other | [5] | (5,000) | (100,000) | 0 |  |  |
Balance at close of year |  | 153,994,000 | 104,609,000 | 46,782,000 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Development in Progress [Member] | 71 France - Edina, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 4,721,000 |  |
Buildings & Improvements |  |  |  |  | 27,655,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,761,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 4,721,000 |  |
Buildings & Improvements |  |  |  |  | 30,416,000 |  |
Total |  | 35,137,000 |  |  | 35,137,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 35,137,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Development in Progress [Member] | Cardinal Point - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,600,000 |  |
Buildings & Improvements |  |  |  |  | 21,455,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,395,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,600,000 |  |
Buildings & Improvements |  |  |  |  | 24,850,000 |  |
Total |  | 26,450,000 |  |  | 26,450,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 26,450,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Development in Progress [Member] | Chateau II - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 240,000 |  |
Buildings & Improvements |  |  |  |  | 12,080,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 809,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 240,000 |  |
Buildings & Improvements |  |  |  |  | 12,889,000 |  |
Total |  | 13,129,000 |  |  | 13,129,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 13,129,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Development in Progress [Member] | Deer Ridge - Jamestown, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 711,000 |  |
Buildings & Improvements |  |  |  |  | 13,580,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,064,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 711,000 |  |
Buildings & Improvements |  |  |  |  | 14,644,000 |  |
Total |  | 15,355,000 |  |  | 15,355,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 15,355,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Development in Progress [Member] | Edina 6565 France SMC III - Edina, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 20,799,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,750,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 22,549,000 |  |
Total |  | 22,549,000 |  |  | 22,549,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 22,549,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Development in Progress [Member] | Minot Southgate Retail - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 889,000 |  |
Buildings & Improvements |  |  |  |  | 1,199,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 76,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 889,000 |  |
Buildings & Improvements |  |  |  |  | 1,275,000 |  |
Total |  | 2,164,000 |  |  | 2,164,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,164,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Development in Progress [Member] | Other [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 402,000 |  |
Buildings & Improvements |  |  |  |  | 3,233,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,983,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 402,000 |  |
Buildings & Improvements |  |  |  |  | 6,216,000 |  |
Total |  | 6,618,000 |  |  | 6,618,000 |  |
Accumulated Depreciation |  | 0 |  |  | 0 |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 6,618,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Development in Progress [Member] | PrairieCare Medical - Brooklyn Park, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,610,000 |  |
Buildings & Improvements |  |  |  |  | 14,715,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,132,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,610,000 |  |
Buildings & Improvements |  |  |  |  | 16,847,000 |  |
Total |  | 19,457,000 |  |  | 19,457,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 19,457,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Development in Progress [Member] | Renaissance Heights - Williston ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 616,000 |  |
Buildings & Improvements |  |  |  |  | 11,156,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,363,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 616,000 |  |
Buildings & Improvements |  |  |  |  | 12,519,000 |  |
Total |  | 13,135,000 |  |  | 13,135,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 13,135,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 23,564,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,263,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 25,827,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 25,827,000 | 21,503,000 | 21,503,000 | 25,827,000 | $ 22,864,000 | $ 21,503,000
Accumulated Depreciation |  | 0 |  |  | 0 |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at beginning of year |  | 22,864,000 | 21,503,000 | 10,990,000 |  |  |
Acquisitions |  | 10,487,000 | 3,022,000 | 13,329,000 |  |  |
Improvements and Other |  | 1,533,000 | 1,209,000 | 854,000 |  |  |
Cost of real estate sold |  | (670,000) | 0 | 0 |  |  |
Impairment charge |  | (1,293,000) | 0 | 0 |  |  |
Transfers |  | (79,000) | 0 | 0 |  |  |
Balance at close of year |  | 25,827,000 | 22,864,000 | 21,503,000 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Legends at Heritage Place - Sartell, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 537,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 537,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 537,000 |  |  | 537,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 537,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Spring Creek Fruitland - Fruitland, ID [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 339,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 339,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 339,000 |  |  | 339,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 339,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Badger Hills - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,050,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,050,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 1,050,000 |  |  | 1,050,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,050,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Bismarck 4916 - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,250,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,250,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 3,250,000 |  |  | 3,250,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,250,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Bismarck 700 E Main - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 314,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 565,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 879,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 879,000 |  |  | 879,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 879,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Creekside Crossing - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 4,286,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 4,286,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 4,286,000 |  |  | 4,286,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 4,286,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Georgetown Square - Grand Chute, WI [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,860,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,860,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 1,860,000 |  |  | 1,860,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,860,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Grand Forks Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 4,278,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 4,278,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 4,278,000 |  |  | 4,278,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 4,278,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Isanti Unimproved - Isanti, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 58,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 58,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 58,000 |  |  | 58,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 58,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Minot 1525 24th Ave SW - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,262,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,262,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 1,262,000 |  |  | 1,262,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,262,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Monticello - Monticello, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 115,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 118,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 118,000 |  |  | 118,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 118,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Monticello 7th Addition - Monticello, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,734,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,734,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 1,734,000 |  |  | 1,734,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,734,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Rapid City Unimproved- Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,376,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,376,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 1,376,000 |  |  | 1,376,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,376,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Renaissance Heights - Williston ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,229,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,581,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,810,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 3,810,000 |  |  | 3,810,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,810,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | River Falls - River Falls, WI [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 176,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 5,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 181,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 181,000 |  |  | 181,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 181,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | TCA - Eagan, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 325,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 325,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 325,000 |  |  | 325,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 325,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Urbandale - Urbandale, IA [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 5,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 109,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 114,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 114,000 |  |  | 114,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2009 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 114,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land [Member] | Weston - Weston, WI [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 370,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 370,000 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Total |  | 370,000 |  |  | 370,000 |  |
Accumulated Depreciation |  | $ 0 |  |  | 0 |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 370,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 0 |  |  |  |  |
Unimproved Land Moved to Development in Progress [Member] |  |  |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Transfers |  | (7,015,000) | (2,870,000) | (3,670,000) |  |  |
Multi-Family Residential [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 423,385,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 65,410,000 |  |
Buildings & Improvements |  |  |  |  | 746,299,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 134,811,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 81,919,000 |  |
Buildings & Improvements |  |  |  |  | 864,601,000 |  |
Total |  | 946,520,000 |  |  | 946,520,000 |  |
Accumulated Depreciation |  | (180,414,000) |  |  | (180,414,000) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 946,520,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 180,414,000 |  |  |  |  |
Multi-Family Residential [Member] | 11th Street 3 Plex - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 84,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 11,000 |  |
Buildings & Improvements |  |  |  |  | 53,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 19,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 20,000 |  |
Buildings & Improvements |  |  |  |  | 63,000 |  |
Total |  | 83,000 |  |  | 83,000 |  |
Accumulated Depreciation |  | $ (12,000) |  |  | (12,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 83,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 12,000 |  |  |  |  |
Multi-Family Residential [Member] | 4th Street 4 Plex - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 98,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 15,000 |  |
Buildings & Improvements |  |  |  |  | 74,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 34,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 23,000 |  |
Buildings & Improvements |  |  |  |  | 100,000 |  |
Total |  | 123,000 |  |  | 123,000 |  |
Accumulated Depreciation |  | $ (19,000) |  |  | (19,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 123,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 19,000 |  |  |  |  |
Multi-Family Residential [Member] | Alps Park - Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,934,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 287,000 |  |
Buildings & Improvements |  |  |  |  | 5,551,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 165,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 293,000 |  |
Buildings & Improvements |  |  |  |  | 5,710,000 |  |
Total |  | 6,003,000 |  |  | 6,003,000 |  |
Accumulated Depreciation |  | $ (299,000) |  |  | (299,000) |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 6,003,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 299,000 |  |  |  |  |
Multi-Family Residential [Member] | Apartments on Main - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 642,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 158,000 |  |
Buildings & Improvements |  |  |  |  | 1,123,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 53,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 193,000 |  |
Buildings & Improvements |  |  |  |  | 1,141,000 |  |
Total |  | 1,334,000 |  |  | 1,334,000 |  |
Accumulated Depreciation |  | $ (235,000) |  |  | (235,000) |  |
Date of Construction or Acquisition |  | 1987 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,334,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 235,000 |  |  |  |  |
Multi-Family Residential [Member] | Apartments on Main - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Apartments on Main - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Arbors - S Sioux City, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,840,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 350,000 |  |
Buildings & Improvements |  |  |  |  | 6,625,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,923,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 980,000 |  |
Buildings & Improvements |  |  |  |  | 7,918,000 |  |
Total |  | $ 8,898,000 |  |  | 8,898,000 |  |
Accumulated Depreciation |  | $ (2,115,000) |  |  | (2,115,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,898,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,115,000 |  |  |  |  |
Multi-Family Residential [Member] | Arcata - Golden Valley, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,088,000 |  |
Buildings & Improvements |  |  |  |  | 29,640,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 95,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,088,000 |  |
Buildings & Improvements |  |  |  |  | 29,735,000 |  |
Total |  | 31,823,000 |  |  | 31,823,000 |  |
Accumulated Depreciation |  | $ (380,000) |  |  | (380,000) |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 31,823,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 380,000 |  |  |  |  |
Multi-Family Residential [Member] | Ashland - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 5,517,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 741,000 |  |
Buildings & Improvements |  |  |  |  | 7,569,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 163,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 774,000 |  |
Buildings & Improvements |  |  |  |  | 7,699,000 |  |
Total |  | 8,473,000 |  |  | 8,473,000 |  |
Accumulated Depreciation |  | $ (678,000) |  |  | (678,000) |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,473,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 678,000 |  |  |  |  |
Multi-Family Residential [Member] | Boulder Court - Eagan, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,736,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,067,000 |  |
Buildings & Improvements |  |  |  |  | 5,498,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,005,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,324,000 |  |
Buildings & Improvements |  |  |  |  | 8,246,000 |  |
Total |  | 9,570,000 |  |  | 9,570,000 |  |
Accumulated Depreciation |  | $ (2,539,000) |  |  | (2,539,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,570,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,539,000 |  |  |  |  |
Multi-Family Residential [Member] | Brookfield Village - Topeka, KS [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 5,216,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 509,000 |  |
Buildings & Improvements |  |  |  |  | 6,698,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,539,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 756,000 |  |
Buildings & Improvements |  |  |  |  | 7,990,000 |  |
Total |  | 8,746,000 |  |  | 8,746,000 |  |
Accumulated Depreciation |  | $ (2,348,000) |  |  | (2,348,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,746,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,348,000 |  |  |  |  |
Multi-Family Residential [Member] | Brooklyn Heights - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 694,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 145,000 |  |
Buildings & Improvements |  |  |  |  | 1,450,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 879,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 219,000 |  |
Buildings & Improvements |  |  |  |  | 2,255,000 |  |
Total |  | 2,474,000 |  |  | 2,474,000 |  |
Accumulated Depreciation |  | $ (949,000) |  |  | (949,000) |  |
Date of Construction or Acquisition |  | 1997 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,474,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 949,000 |  |  |  |  |
Multi-Family Residential [Member] | Brooklyn Heights - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 12 years |  |  |  |  |
Multi-Family Residential [Member] | Brooklyn Heights - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Campus Center - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,127,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 395,000 |  |
Buildings & Improvements |  |  |  |  | 2,244,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 243,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 407,000 |  |
Buildings & Improvements |  |  |  |  | 2,475,000 |  |
Total |  | $ 2,882,000 |  |  | 2,882,000 |  |
Accumulated Depreciation |  | $ (534,000) |  |  | (534,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,882,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 534,000 |  |  |  |  |
Multi-Family Residential [Member] | Campus Heights - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 110,000 |  |
Buildings & Improvements |  |  |  |  | 628,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 157,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 124,000 |  |
Buildings & Improvements |  |  |  |  | 771,000 |  |
Total |  | 895,000 |  |  | 895,000 |  |
Accumulated Depreciation |  | $ (163,000) |  |  | (163,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 895,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 163,000 |  |  |  |  |
Multi-Family Residential [Member] | Campus Knoll - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 752,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 266,000 |  |
Buildings & Improvements |  |  |  |  | 1,512,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 180,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 305,000 |  |
Buildings & Improvements |  |  |  |  | 1,653,000 |  |
Total |  | 1,958,000 |  |  | 1,958,000 |  |
Accumulated Depreciation |  | $ (364,000) |  |  | (364,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,958,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 364,000 |  |  |  |  |
Multi-Family Residential [Member] | Campus Plaza - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 54,000 |  |
Buildings & Improvements |  |  |  |  | 311,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 85,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 60,000 |  |
Buildings & Improvements |  |  |  |  | 390,000 |  |
Total |  | 450,000 |  |  | 450,000 |  |
Accumulated Depreciation |  | $ (87,000) |  |  | (87,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 450,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 87,000 |  |  |  |  |
Multi-Family Residential [Member] | Campus Side - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 107,000 |  |
Buildings & Improvements |  |  |  |  | 615,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 161,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 118,000 |  |
Buildings & Improvements |  |  |  |  | 765,000 |  |
Total |  | 883,000 |  |  | 883,000 |  |
Accumulated Depreciation |  | $ (170,000) |  |  | (170,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 883,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 170,000 |  |  |  |  |
Multi-Family Residential [Member] | Campus View - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 107,000 |  |
Buildings & Improvements |  |  |  |  | 615,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 156,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 113,000 |  |
Buildings & Improvements |  |  |  |  | 765,000 |  |
Total |  | 878,000 |  |  | 878,000 |  |
Accumulated Depreciation |  | $ (164,000) |  |  | (164,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 878,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 164,000 |  |  |  |  |
Multi-Family Residential [Member] | Canyon Lake - Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,843,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 305,000 |  |
Buildings & Improvements |  |  |  |  | 3,958,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,652,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 376,000 |  |
Buildings & Improvements |  |  |  |  | 5,539,000 |  |
Total |  | 5,915,000 |  |  | 5,915,000 |  |
Accumulated Depreciation |  | $ (1,739,000) |  |  | (1,739,000) |  |
Date of Construction or Acquisition |  | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,915,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,739,000 |  |  |  |  |
Multi-Family Residential [Member] | Castlerock - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 6,574,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 736,000 |  |
Buildings & Improvements |  |  |  |  | 4,864,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,165,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 994,000 |  |
Buildings & Improvements |  |  |  |  | 6,771,000 |  |
Total |  | 7,765,000 |  |  | 7,765,000 |  |
Accumulated Depreciation |  | $ (2,726,000) |  |  | (2,726,000) |  |
Date of Construction or Acquisition |  | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,765,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,726,000 |  |  |  |  |
Multi-Family Residential [Member] | Chateau I - Minot ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 61,000 |  |
Buildings & Improvements |  |  |  |  | 5,663,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 683,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 71,000 |  |
Buildings & Improvements |  |  |  |  | 6,336,000 |  |
Total |  | 6,407,000 |  |  | 6,407,000 |  |
Accumulated Depreciation |  | $ (786,000) |  |  | (786,000) |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 6,407,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 786,000 |  |  |  |  |
Multi-Family Residential [Member] | Cimarron Hills - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 4,729,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 706,000 |  |
Buildings & Improvements |  |  |  |  | 9,588,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,346,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,334,000 |  |
Buildings & Improvements |  |  |  |  | 13,306,000 |  |
Total |  | 14,640,000 |  |  | 14,640,000 |  |
Accumulated Depreciation |  | $ (4,723,000) |  |  | (4,723,000) |  |
Date of Construction or Acquisition |  | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 14,640,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,723,000 |  |  |  |  |
Multi-Family Residential [Member] | Colonial Villa - Burnsville, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 5,473,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,401,000 |  |
Buildings & Improvements |  |  |  |  | 11,515,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 7,471,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,844,000 |  |
Buildings & Improvements |  |  |  |  | 18,543,000 |  |
Total |  | 21,387,000 |  |  | 21,387,000 |  |
Accumulated Depreciation |  | $ (5,255,000) |  |  | (5,255,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 21,387,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 5,255,000 |  |  |  |  |
Multi-Family Residential [Member] | Colony - Lincoln, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 13,303,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,515,000 |  |
Buildings & Improvements |  |  |  |  | 15,730,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 671,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,574,000 |  |
Buildings & Improvements |  |  |  |  | 16,342,000 |  |
Total |  | 17,916,000 |  |  | 17,916,000 |  |
Accumulated Depreciation |  | $ (1,316,000) |  |  | (1,316,000) |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 17,916,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,316,000 |  |  |  |  |
Multi-Family Residential [Member] | Colton Heights - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 391,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 80,000 |  |
Buildings & Improvements |  |  |  |  | 672,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 421,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 123,000 |  |
Buildings & Improvements |  |  |  |  | 1,050,000 |  |
Total |  | 1,173,000 |  |  | 1,173,000 |  |
Accumulated Depreciation |  | $ (769,000) |  |  | (769,000) |  |
Date of Construction or Acquisition |  | 1984 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,173,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 769,000 |  |  |  |  |
Multi-Family Residential [Member] | Commons at Southgate - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,691,000 |  |
Buildings & Improvements |  |  |  |  | 31,351,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 580,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,703,000 |  |
Buildings & Improvements |  |  |  |  | 31,919,000 |  |
Total |  | 35,622,000 |  |  | 35,622,000 |  |
Accumulated Depreciation |  | $ (993,000) |  |  | (993,000) |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 35,622,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 993,000 |  |  |  |  |
Multi-Family Residential [Member] | Cornerstone - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 54,000 |  |
Buildings & Improvements |  |  |  |  | 311,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 88,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 57,000 |  |
Buildings & Improvements |  |  |  |  | 396,000 |  |
Total |  | 453,000 |  |  | 453,000 |  |
Accumulated Depreciation |  | $ (89,000) |  |  | (89,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 453,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 89,000 |  |  |  |  |
Multi-Family Residential [Member] | Cottage West Twin Homes - Sioux Falls, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,586,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 968,000 |  |
Buildings & Improvements |  |  |  |  | 3,762,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 432,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,022,000 |  |
Buildings & Improvements |  |  |  |  | 4,140,000 |  |
Total |  | 5,162,000 |  |  | 5,162,000 |  |
Accumulated Depreciation |  | $ (378,000) |  |  | (378,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,162,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 378,000 |  |  |  |  |
Multi-Family Residential [Member] | Cottonwood - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 15,586,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,056,000 |  |
Buildings & Improvements |  |  |  |  | 17,372,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,294,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,383,000 |  |
Buildings & Improvements |  |  |  |  | 20,339,000 |  |
Total |  | 21,722,000 |  |  | 21,722,000 |  |
Accumulated Depreciation |  | $ (6,904,000) |  |  | (6,904,000) |  |
Date of Construction or Acquisition |  | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 21,722,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 6,904,000 |  |  |  |  |
Multi-Family Residential [Member] | Country Meadows - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 6,560,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 491,000 |  |
Buildings & Improvements |  |  |  |  | 7,809,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,486,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 538,000 |  |
Buildings & Improvements |  |  |  |  | 9,248,000 |  |
Total |  | 9,786,000 |  |  | 9,786,000 |  |
Accumulated Depreciation |  | $ (3,797,000) |  |  | (3,797,000) |  |
Date of Construction or Acquisition |  | 1995 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,786,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,797,000 |  |  |  |  |
Multi-Family Residential [Member] | Country Meadows - Billings, MT [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 33 years |  |  |  |  |
Multi-Family Residential [Member] | Country Meadows - Billings, MT [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Crestview - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,839,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 235,000 |  |
Buildings & Improvements |  |  |  |  | 4,290,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,682,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 515,000 |  |
Buildings & Improvements |  |  |  |  | 5,692,000 |  |
Total |  | $ 6,207,000 |  |  | 6,207,000 |  |
Accumulated Depreciation |  | $ (2,915,000) |  |  | (2,915,000) |  |
Date of Construction or Acquisition |  | 1994 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 6,207,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,915,000 |  |  |  |  |
Multi-Family Residential [Member] | Crestview - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Crestview - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Crown - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,571,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 261,000 |  |
Buildings & Improvements |  |  |  |  | 3,289,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 246,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 269,000 |  |
Buildings & Improvements |  |  |  |  | 3,527,000 |  |
Total |  | $ 3,796,000 |  |  | 3,796,000 |  |
Accumulated Depreciation |  | $ (470,000) |  |  | (470,000) |  |
Date of Construction or Acquisition |  | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,796,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 470,000 |  |  |  |  |
Multi-Family Residential [Member] | Crown Colony - Topeka, KS [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 8,081,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 620,000 |  |
Buildings & Improvements |  |  |  |  | 9,956,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,388,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 898,000 |  |
Buildings & Improvements |  |  |  |  | 12,066,000 |  |
Total |  | 12,964,000 |  |  | 12,964,000 |  |
Accumulated Depreciation |  | $ (4,531,000) |  |  | (4,531,000) |  |
Date of Construction or Acquisition |  | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 12,964,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,531,000 |  |  |  |  |
Multi-Family Residential [Member] | Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 13,150,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,583,000 |  |
Buildings & Improvements |  |  |  |  | 18,874,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 148,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,583,000 |  |
Buildings & Improvements |  |  |  |  | 19,022,000 |  |
Total |  | 20,605,000 |  |  | 20,605,000 |  |
Accumulated Depreciation |  | $ (652,000) |  |  | (652,000) |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 20,605,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 652,000 |  |  |  |  |
Multi-Family Residential [Member] | Dakota Commons - Williston, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1],[6] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 823,000 |  |
Buildings & Improvements | [6] |  |  |  | 9,596,000 |  |
Costs capitalized subsequent to acquisition | [6] |  |  |  | 25,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 824,000 |  |
Buildings & Improvements | [6] |  |  |  | 9,620,000 |  |
Total | [6] | 10,444,000 |  |  | 10,444,000 |  |
Accumulated Depreciation | [6] | $ (236,000) |  |  | (236,000) |  |
Date of Construction or Acquisition | [6] | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | [6] | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | $ 10,444,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | 236,000 |  |  |  |  |
Multi-Family Residential [Member] | Evergreen - Isanti, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,986,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 380,000 |  |
Buildings & Improvements |  |  |  |  | 2,740,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 116,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 385,000 |  |
Buildings & Improvements |  |  |  |  | 2,851,000 |  |
Total |  | 3,236,000 |  |  | 3,236,000 |  |
Accumulated Depreciation |  | $ (474,000) |  |  | (474,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,236,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 474,000 |  |  |  |  |
Multi-Family Residential [Member] | Evergreen II - Isanti, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,066,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 691,000 |  |
Buildings & Improvements |  |  |  |  | 2,784,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 55,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 698,000 |  |
Buildings & Improvements |  |  |  |  | 2,832,000 |  |
Total |  | 3,530,000 |  |  | 3,530,000 |  |
Accumulated Depreciation |  | $ (277,000) |  |  | (277,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,530,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 277,000 |  |  |  |  |
Multi-Family Residential [Member] | Fairmont - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 332,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 28,000 |  |
Buildings & Improvements |  |  |  |  | 337,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 117,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 55,000 |  |
Buildings & Improvements |  |  |  |  | 427,000 |  |
Total |  | 482,000 |  |  | 482,000 |  |
Accumulated Depreciation |  | $ (76,000) |  |  | (76,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 482,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 76,000 |  |  |  |  |
Multi-Family Residential [Member] | First Avenue - Minot ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 3,046,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 11,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 3,057,000 |  |
Total |  | 3,057,000 |  |  | 3,057,000 |  |
Accumulated Depreciation |  | $ (155,000) |  |  | (155,000) |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,057,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 155,000 |  |  |  |  |
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 7,560,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 810,000 |  |
Buildings & Improvements |  |  |  |  | 5,579,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 7,407,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,426,000 |  |
Buildings & Improvements |  |  |  |  | 12,370,000 |  |
Total |  | 13,796,000 |  |  | 13,796,000 |  |
Accumulated Depreciation |  | $ (5,333,000) |  |  | (5,333,000) |  |
Date of Construction or Acquisition |  | 1993 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 13,796,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,333,000 |  |  |  |  |
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Gables Townhomes - Sioux Falls, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,452,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 349,000 |  |
Buildings & Improvements |  |  |  |  | 1,921,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 173,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 374,000 |  |
Buildings & Improvements |  |  |  |  | 2,069,000 |  |
Total |  | $ 2,443,000 |  |  | 2,443,000 |  |
Accumulated Depreciation |  | $ (189,000) |  |  | (189,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,443,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 189,000 |  |  |  |  |
Multi-Family Residential [Member] | Grand Gateway - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 5,345,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 814,000 |  |
Buildings & Improvements |  |  |  |  | 7,086,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 805,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 934,000 |  |
Buildings & Improvements |  |  |  |  | 7,771,000 |  |
Total |  | 8,705,000 |  |  | 8,705,000 |  |
Accumulated Depreciation |  | $ (746,000) |  |  | (746,000) |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,705,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 746,000 |  |  |  |  |
Multi-Family Residential [Member] | Greenfield - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,552,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 578,000 |  |
Buildings & Improvements |  |  |  |  | 4,122,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 769,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 803,000 |  |
Buildings & Improvements |  |  |  |  | 4,666,000 |  |
Total |  | 5,469,000 |  |  | 5,469,000 |  |
Accumulated Depreciation |  | $ (932,000) |  |  | (932,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,469,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 932,000 |  |  |  |  |
Multi-Family Residential [Member] | Heritage Manor - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,895,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 403,000 |  |
Buildings & Improvements |  |  |  |  | 6,968,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,796,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 580,000 |  |
Buildings & Improvements |  |  |  |  | 9,587,000 |  |
Total |  | 10,167,000 |  |  | 10,167,000 |  |
Accumulated Depreciation |  | $ (3,751,000) |  |  | (3,751,000) |  |
Date of Construction or Acquisition |  | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 10,167,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,751,000 |  |  |  |  |
Multi-Family Residential [Member] | Homestead Garden - Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 9,761,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 655,000 |  |
Buildings & Improvements |  |  |  |  | 14,139,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 156,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 658,000 |  |
Buildings & Improvements |  |  |  |  | 14,292,000 |  |
Total |  | 14,950,000 |  |  | 14,950,000 |  |
Accumulated Depreciation |  | $ (329,000) |  |  | (329,000) |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 14,950,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 329,000 |  |  |  |  |
Multi-Family Residential [Member] | Indian Hills - Sioux City, IA [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 294,000 |  |
Buildings & Improvements |  |  |  |  | 2,921,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,709,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 397,000 |  |
Buildings & Improvements |  |  |  |  | 6,527,000 |  |
Total |  | 6,924,000 |  |  | 6,924,000 |  |
Accumulated Depreciation |  | $ (1,353,000) |  |  | (1,353,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 6,924,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,353,000 |  |  |  |  |
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,259,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 449,000 |  |
Buildings & Improvements |  |  |  |  | 2,725,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,676,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 553,000 |  |
Buildings & Improvements |  |  |  |  | 4,297,000 |  |
Total |  | 4,850,000 |  |  | 4,850,000 |  |
Accumulated Depreciation |  | $ (1,786,000) |  |  | (1,786,000) |  |
Date of Construction or Acquisition |  | 1997 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 4,850,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,786,000 |  |  |  |  |
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 12 years |  |  |  |  |
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Lakeside Village Lincoln, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 13,129,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,215,000 |  |
Buildings & Improvements |  |  |  |  | 15,837,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 442,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,263,000 |  |
Buildings & Improvements |  |  |  |  | 16,231,000 |  |
Total |  | $ 17,494,000 |  |  | 17,494,000 |  |
Accumulated Depreciation |  | $ (1,294,000) |  |  | (1,294,000) |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 17,494,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,294,000 |  |  |  |  |
Multi-Family Residential [Member] | Landing at Southgate - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,254,000 |  |
Buildings & Improvements |  |  |  |  | 12,955,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 93,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,294,000 |  |
Buildings & Improvements |  |  |  |  | 13,008,000 |  |
Total |  | 15,302,000 |  |  | 15,302,000 |  |
Accumulated Depreciation |  | $ (546,000) |  |  | (546,000) |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 15,302,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 546,000 |  |  |  |  |
Multi-Family Residential [Member] | Landmark - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,573,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 184,000 |  |
Buildings & Improvements |  |  |  |  | 1,514,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,093,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 331,000 |  |
Buildings & Improvements |  |  |  |  | 2,460,000 |  |
Total |  | 2,791,000 |  |  | 2,791,000 |  |
Accumulated Depreciation |  | $ (1,070,000) |  |  | (1,070,000) |  |
Date of Construction or Acquisition |  | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,791,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,070,000 |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 15,528,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,362,000 |  |
Buildings & Improvements |  |  |  |  | 21,727,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 6,665,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,133,000 |  |
Buildings & Improvements |  |  |  |  | 27,621,000 |  |
Total |  | 29,754,000 |  |  | 29,754,000 |  |
Accumulated Depreciation |  | (10,186,000) |  |  | (10,186,000) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 29,754,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 10,186,000 |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Date of Construction or Acquisition |  | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Legacy Heights - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 804,000 |  |
Buildings & Improvements |  |  |  |  | 9,162,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 73,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 804,000 |  |
Buildings & Improvements |  |  |  |  | 9,235,000 |  |
Total |  | $ 10,039,000 |  |  | 10,039,000 |  |
Accumulated Depreciation |  | $ (21,000) |  |  | (21,000) |  |
Date of Construction or Acquisition |  | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 10,039,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 21,000 |  |  |  |  |
Multi-Family Residential [Member] | Mariposa - Topeka, KS [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,925,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 399,000 |  |
Buildings & Improvements |  |  |  |  | 5,110,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 535,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 427,000 |  |
Buildings & Improvements |  |  |  |  | 5,617,000 |  |
Total |  | 6,044,000 |  |  | 6,044,000 |  |
Accumulated Depreciation |  | $ (1,498,000) |  |  | (1,498,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 6,044,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,498,000 |  |  |  |  |
Multi-Family Residential [Member] | Meadows - Jamestown, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1],[6] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 590,000 |  |
Buildings & Improvements | [6] |  |  |  | 4,519,000 |  |
Costs capitalized subsequent to acquisition | [6] |  |  |  | 1,355,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 669,000 |  |
Buildings & Improvements | [6] |  |  |  | 5,795,000 |  |
Total | [6] | 6,464,000 |  |  | 6,464,000 |  |
Accumulated Depreciation | [6] | $ (2,135,000) |  |  | (2,135,000) |  |
Date of Construction or Acquisition | [6] | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | [6] | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | $ 6,464,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | 2,135,000 |  |  |  |  |
Multi-Family Residential [Member] | Monticello Village - Monticello, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,956,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 490,000 |  |
Buildings & Improvements |  |  |  |  | 3,756,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 491,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 621,000 |  |
Buildings & Improvements |  |  |  |  | 4,116,000 |  |
Total |  | 4,737,000 |  |  | 4,737,000 |  |
Accumulated Depreciation |  | $ (1,257,000) |  |  | (1,257,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 4,737,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,257,000 |  |  |  |  |
Multi-Family Residential [Member] | Northern Valley - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 110,000 |  |
Buildings & Improvements |  |  |  |  | 610,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 129,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 119,000 |  |
Buildings & Improvements |  |  |  |  | 730,000 |  |
Total |  | 849,000 |  |  | 849,000 |  |
Accumulated Depreciation |  | $ (100,000) |  |  | (100,000) |  |
Date of Construction or Acquisition |  | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 849,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 100,000 |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,382,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 303,000 |  |
Buildings & Improvements |  |  |  |  | 3,957,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 622,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 354,000 |  |
Buildings & Improvements |  |  |  |  | 4,528,000 |  |
Total |  | 4,882,000 |  |  | 4,882,000 |  |
Accumulated Depreciation |  | (1,474,000) |  |  | (1,474,000) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,882,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,474,000 |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Date of Construction or Acquisition |  | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 24 years |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Northridge - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 6,322,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 884,000 |  |
Buildings & Improvements |  |  |  |  | 7,516,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 26,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 888,000 |  |
Buildings & Improvements |  |  |  |  | 7,538,000 |  |
Total |  | $ 8,426,000 |  |  | 8,426,000 |  |
Accumulated Depreciation |  | $ (126,000) |  |  | (126,000) |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,426,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 126,000 |  |  |  |  |
Multi-Family Residential [Member] | Oakmont Estates - Sioux Falls, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,418,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 422,000 |  |
Buildings & Improvements |  |  |  |  | 4,838,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 638,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 627,000 |  |
Buildings & Improvements |  |  |  |  | 5,271,000 |  |
Total |  | 5,898,000 |  |  | 5,898,000 |  |
Accumulated Depreciation |  | $ (1,746,000) |  |  | (1,746,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,898,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,746,000 |  |  |  |  |
Multi-Family Residential [Member] | Oakwood Estates - Sioux Falls, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,939,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 543,000 |  |
Buildings & Improvements |  |  |  |  | 2,784,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,336,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 777,000 |  |
Buildings & Improvements |  |  |  |  | 6,886,000 |  |
Total |  | 7,663,000 |  |  | 7,663,000 |  |
Accumulated Depreciation |  | $ (3,214,000) |  |  | (3,214,000) |  |
Date of Construction or Acquisition |  | 1993 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,663,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,214,000 |  |  |  |  |
Multi-Family Residential [Member] | Olympic Village - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 10,575,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,164,000 |  |
Buildings & Improvements |  |  |  |  | 10,441,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,086,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,785,000 |  |
Buildings & Improvements |  |  |  |  | 12,906,000 |  |
Total |  | 14,691,000 |  |  | 14,691,000 |  |
Accumulated Depreciation |  | $ (4,881,000) |  |  | (4,881,000) |  |
Date of Construction or Acquisition |  | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 14,691,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,881,000 |  |  |  |  |
Multi-Family Residential [Member] | Olympik Village - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 4,382,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,034,000 |  |
Buildings & Improvements |  |  |  |  | 6,109,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,968,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,183,000 |  |
Buildings & Improvements |  |  |  |  | 7,928,000 |  |
Total |  | 9,111,000 |  |  | 9,111,000 |  |
Accumulated Depreciation |  | $ (2,127,000) |  |  | (2,127,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,111,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,127,000 |  |  |  |  |
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,846,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 404,000 |  |
Buildings & Improvements |  |  |  |  | 3,152,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,894,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 824,000 |  |
Buildings & Improvements |  |  |  |  | 5,626,000 |  |
Total |  | 6,450,000 |  |  | 6,450,000 |  |
Accumulated Depreciation |  | $ (2,808,000) |  |  | (2,808,000) |  |
Date of Construction or Acquisition |  | 1994 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 6,450,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,808,000 |  |  |  |  |
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Park Meadows - Waite Park, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 8,482,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,143,000 |  |
Buildings & Improvements |  |  |  |  | 9,099,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 5,792,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,629,000 |  |
Buildings & Improvements |  |  |  |  | 14,405,000 |  |
Total |  | $ 16,034,000 |  |  | 16,034,000 |  |
Accumulated Depreciation |  | $ (5,939,000) |  |  | (5,939,000) |  |
Date of Construction or Acquisition |  | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 16,034,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 5,939,000 |  |  |  |  |
Multi-Family Residential [Member] | Pebble Springs - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 757,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 7,000 |  |
Buildings & Improvements |  |  |  |  | 748,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 165,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 54,000 |  |
Buildings & Improvements |  |  |  |  | 866,000 |  |
Total |  | 920,000 |  |  | 920,000 |  |
Accumulated Depreciation |  | $ (349,000) |  |  | (349,000) |  |
Date of Construction or Acquisition |  | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 920,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 349,000 |  |  |  |  |
Multi-Family Residential [Member] | Pinehurst - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 205,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 72,000 |  |
Buildings & Improvements |  |  |  |  | 687,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 251,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 81,000 |  |
Buildings & Improvements |  |  |  |  | 929,000 |  |
Total |  | 1,010,000 |  |  | 1,010,000 |  |
Accumulated Depreciation |  | $ (305,000) |  |  | (305,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,010,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 305,000 |  |  |  |  |
Multi-Family Residential [Member] | Pinecone Villas - Sartell, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 584,000 |  |
Buildings & Improvements |  |  |  |  | 2,191,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 27,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 585,000 |  |
Buildings & Improvements |  |  |  |  | 2,217,000 |  |
Total |  | 2,802,000 |  |  | 2,802,000 |  |
Accumulated Depreciation |  | $ (95,000) |  |  | (95,000) |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,802,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 95,000 |  |  |  |  |
Multi-Family Residential [Member] | Pines - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 111,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 35,000 |  |
Buildings & Improvements |  |  |  |  | 215,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 185,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 49,000 |  |
Buildings & Improvements |  |  |  |  | 386,000 |  |
Total |  | 435,000 |  |  | 435,000 |  |
Accumulated Depreciation |  | $ (141,000) |  |  | (141,000) |  |
Date of Construction or Acquisition |  | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 435,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 141,000 |  |  |  |  |
Multi-Family Residential [Member] | Plaza - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 5,348,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 867,000 |  |
Buildings & Improvements |  |  |  |  | 12,784,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,455,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 995,000 |  |
Buildings & Improvements |  |  |  |  | 15,111,000 |  |
Total |  | 16,106,000 |  |  | 16,106,000 |  |
Accumulated Depreciation |  | $ (2,433,000) |  |  | (2,433,000) |  |
Date of Construction or Acquisition |  | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 16,106,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,433,000 |  |  |  |  |
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,624,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 240,000 |  |
Buildings & Improvements |  |  |  |  | 3,538,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,527,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 368,000 |  |
Buildings & Improvements |  |  |  |  | 4,937,000 |  |
Total |  | 5,305,000 |  |  | 5,305,000 |  |
Accumulated Depreciation |  | $ (2,379,000) |  |  | (2,379,000) |  |
Date of Construction or Acquisition |  | 1994 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,305,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,379,000 |  |  |  |  |
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Ponds at Heritage Place - Sartell, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,852,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 395,000 |  |
Buildings & Improvements |  |  |  |  | 4,564,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 320,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 404,000 |  |
Buildings & Improvements |  |  |  |  | 4,875,000 |  |
Total |  | $ 5,279,000 |  |  | 5,279,000 |  |
Accumulated Depreciation |  | $ (363,000) |  |  | (363,000) |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,279,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 363,000 |  |  |  |  |
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,410,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 144,000 |  |
Buildings & Improvements |  |  |  |  | 1,816,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 487,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 235,000 |  |
Buildings & Improvements |  |  |  |  | 2,212,000 |  |
Total |  | 2,447,000 |  |  | 2,447,000 |  |
Accumulated Depreciation |  | $ (1,228,000) |  |  | (1,228,000) |  |
Date of Construction or Acquisition |  | 1993 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,447,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,228,000 |  |  |  |  |
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Quarry Ridge - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 27,268,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,254,000 |  |
Buildings & Improvements |  |  |  |  | 30,024,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,392,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,307,000 |  |
Buildings & Improvements |  |  |  |  | 31,363,000 |  |
Total |  | $ 33,670,000 |  |  | 33,670,000 |  |
Accumulated Depreciation |  | $ (4,533,000) |  |  | (4,533,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 33,670,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,533,000 |  |  |  |  |
Multi-Family Residential [Member] | RED 20 - Minneapolis, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,900,000 |  |
Buildings & Improvements |  |  |  |  | 26,412,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,900,000 |  |
Buildings & Improvements |  |  |  |  | 26,416,000 |  |
Total |  | 28,316,000 |  |  | 28,316,000 |  |
Accumulated Depreciation |  | $ (445,000) |  |  | (445,000) |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 28,316,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 445,000 |  |  |  |  |
Multi-Family Residential [Member] | Regency Park Estates - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 6,680,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 702,000 |  |
Buildings & Improvements |  |  |  |  | 10,198,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,465,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 811,000 |  |
Buildings & Improvements |  |  |  |  | 11,554,000 |  |
Total |  | 12,365,000 |  |  | 12,365,000 |  |
Accumulated Depreciation |  | $ (1,162,000) |  |  | (1,162,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 12,365,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,162,000 |  |  |  |  |
Multi-Family Residential [Member] | Ridge Oaks - Sioux City, IA [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,359,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 178,000 |  |
Buildings & Improvements |  |  |  |  | 4,073,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,437,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 288,000 |  |
Buildings & Improvements |  |  |  |  | 6,400,000 |  |
Total |  | 6,688,000 |  |  | 6,688,000 |  |
Accumulated Depreciation |  | $ (2,205,000) |  |  | (2,205,000) |  |
Date of Construction or Acquisition |  | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 6,688,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,205,000 |  |  |  |  |
Multi-Family Residential [Member] | Rimrock West - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,282,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 330,000 |  |
Buildings & Improvements |  |  |  |  | 3,489,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,510,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 435,000 |  |
Buildings & Improvements |  |  |  |  | 4,894,000 |  |
Total |  | 5,329,000 |  |  | 5,329,000 |  |
Accumulated Depreciation |  | $ (1,765,000) |  |  | (1,765,000) |  |
Date of Construction or Acquisition |  | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,329,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,765,000 |  |  |  |  |
Multi-Family Residential [Member] | River Ridge - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 13,200,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 576,000 |  |
Buildings & Improvements |  |  |  |  | 23,826,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 998,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,438,000 |  |
Buildings & Improvements |  |  |  |  | 23,962,000 |  |
Total |  | 25,400,000 |  |  | 25,400,000 |  |
Accumulated Depreciation |  | $ (1,290,000) |  |  | (1,290,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 25,400,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,290,000 |  |  |  |  |
Multi-Family Residential [Member] | Rocky Meadows - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 5,089,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 656,000 |  |
Buildings & Improvements |  |  |  |  | 5,726,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,201,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 772,000 |  |
Buildings & Improvements |  |  |  |  | 6,811,000 |  |
Total |  | 7,583,000 |  |  | 7,583,000 |  |
Accumulated Depreciation |  | $ (3,129,000) |  |  | (3,129,000) |  |
Date of Construction or Acquisition |  | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,583,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,129,000 |  |  |  |  |
Multi-Family Residential [Member] | Rum River - Isanti, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,536,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 843,000 |  |
Buildings & Improvements |  |  |  |  | 4,823,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 215,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 862,000 |  |
Buildings & Improvements |  |  |  |  | 5,019,000 |  |
Total |  | 5,881,000 |  |  | 5,881,000 |  |
Accumulated Depreciation |  | $ (1,020,000) |  |  | (1,020,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,881,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,020,000 |  |  |  |  |
Multi-Family Residential [Member] | Sherwood - Topeka, KS [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 12,134,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,142,000 |  |
Buildings & Improvements |  |  |  |  | 14,684,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,064,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,694,000 |  |
Buildings & Improvements |  |  |  |  | 17,196,000 |  |
Total |  | 18,890,000 |  |  | 18,890,000 |  |
Accumulated Depreciation |  | $ (6,619,000) |  |  | (6,619,000) |  |
Date of Construction or Acquisition |  | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 18,890,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 6,619,000 |  |  |  |  |
Multi-Family Residential [Member] | Sierra Vista - Sioux Falls, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,390,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 241,000 |  |
Buildings & Improvements |  |  |  |  | 2,097,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 435,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 265,000 |  |
Buildings & Improvements |  |  |  |  | 2,508,000 |  |
Total |  | 2,773,000 |  |  | 2,773,000 |  |
Accumulated Depreciation |  | $ (273,000) |  |  | (273,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,773,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 273,000 |  |  |  |  |
Multi-Family Residential [Member] | Silver Springs - Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,230,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 215,000 |  |
Buildings & Improvements |  |  |  |  | 3,006,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 48,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 215,000 |  |
Buildings & Improvements |  |  |  |  | 3,054,000 |  |
Total |  | 3,269,000 |  |  | 3,269,000 |  |
Accumulated Depreciation |  | $ (68,000) |  |  | (68,000) |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,269,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 68,000 |  |  |  |  |
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 8,613,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 550,000 |  |
Buildings & Improvements |  |  |  |  | 9,548,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,847,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,343,000 |  |
Buildings & Improvements |  |  |  |  | 11,602,000 |  |
Total |  | 12,945,000 |  |  | 12,945,000 |  |
Accumulated Depreciation |  | $ (5,494,000) |  |  | (5,494,000) |  |
Date of Construction or Acquisition |  | 1995 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 12,945,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,494,000 |  |  |  |  |
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 24 years |  |  |  |  |
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Southpoint - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1],[6] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 576,000 |  |
Buildings & Improvements | [6] |  |  |  | 9,893,000 |  |
Costs capitalized subsequent to acquisition | [6] |  |  |  | 48,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 591,000 |  |
Buildings & Improvements | [6] |  |  |  | 9,926,000 |  |
Total | [6] | $ 10,517,000 |  |  | 10,517,000 |  |
Accumulated Depreciation | [6] | $ (414,000) |  |  | (414,000) |  |
Date of Construction or Acquisition | [6] | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | [6] | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | $ 10,517,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | 414,000 |  |  |  |  |
Multi-Family Residential [Member] | Southview - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,035,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 185,000 |  |
Buildings & Improvements |  |  |  |  | 469,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 410,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 240,000 |  |
Buildings & Improvements |  |  |  |  | 824,000 |  |
Total |  | 1,064,000 |  |  | 1,064,000 |  |
Accumulated Depreciation |  | $ (371,000) |  |  | (371,000) |  |
Date of Construction or Acquisition |  | 1994 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,064,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 371,000 |  |  |  |  |
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 5,503,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 400,000 |  |
Buildings & Improvements |  |  |  |  | 5,034,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,974,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 765,000 |  |
Buildings & Improvements |  |  |  |  | 7,643,000 |  |
Total |  | 8,408,000 |  |  | 8,408,000 |  |
Accumulated Depreciation |  | $ (3,486,000) |  |  | (3,486,000) |  |
Date of Construction or Acquisition |  | 1995 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,408,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,486,000 |  |  |  |  |
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Summit Park - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 963,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 161,000 |  |
Buildings & Improvements |  |  |  |  | 1,898,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,550,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 560,000 |  |
Buildings & Improvements |  |  |  |  | 3,049,000 |  |
Total |  | $ 3,609,000 |  |  | 3,609,000 |  |
Accumulated Depreciation |  | $ (1,249,000) |  |  | (1,249,000) |  |
Date of Construction or Acquisition |  | 1997 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,609,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,249,000 |  |  |  |  |
Multi-Family Residential [Member] | Summit Park - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Summit Park - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Sunset Trail - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 8,009,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 336,000 |  |
Buildings & Improvements |  |  |  |  | 12,814,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,652,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 581,000 |  |
Buildings & Improvements |  |  |  |  | 15,221,000 |  |
Total |  | $ 15,802,000 |  |  | 15,802,000 |  |
Accumulated Depreciation |  | $ (5,453,000) |  |  | (5,453,000) |  |
Date of Construction or Acquisition |  | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 15,802,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 5,453,000 |  |  |  |  |
Multi-Family Residential [Member] | Temple - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 75,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 0 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 231,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 231,000 |  |
Total |  | 231,000 |  |  | 231,000 |  |
Accumulated Depreciation |  | $ (57,000) |  |  | (57,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 231,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 57,000 |  |  |  |  |
Multi-Family Residential [Member] | Terrace Heights - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 160,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 29,000 |  |
Buildings & Improvements |  |  |  |  | 312,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 142,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 40,000 |  |
Buildings & Improvements |  |  |  |  | 443,000 |  |
Total |  | 483,000 |  |  | 483,000 |  |
Accumulated Depreciation |  | $ (172,000) |  |  | (172,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 483,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 172,000 |  |  |  |  |
Multi-Family Residential [Member] | Thomasbrook - Lincoln, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 5,893,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 600,000 |  |
Buildings & Improvements |  |  |  |  | 10,306,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,336,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,403,000 |  |
Buildings & Improvements |  |  |  |  | 12,839,000 |  |
Total |  | 14,242,000 |  |  | 14,242,000 |  |
Accumulated Depreciation |  | $ (4,680,000) |  |  | (4,680,000) |  |
Date of Construction or Acquisition |  | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 14,242,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,680,000 |  |  |  |  |
Multi-Family Residential [Member] | University Park Place - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 78,000 |  |
Buildings & Improvements |  |  |  |  | 450,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 115,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 83,000 |  |
Buildings & Improvements |  |  |  |  | 560,000 |  |
Total |  | 643,000 |  |  | 643,000 |  |
Accumulated Depreciation |  | $ (118,000) |  |  | (118,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 643,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 118,000 |  |  |  |  |
Multi-Family Residential [Member] | Valley Park - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,822,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 294,000 |  |
Buildings & Improvements |  |  |  |  | 4,137,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,508,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,115,000 |  |
Buildings & Improvements |  |  |  |  | 6,824,000 |  |
Total |  | 7,939,000 |  |  | 7,939,000 |  |
Accumulated Depreciation |  | $ (2,599,000) |  |  | (2,599,000) |  |
Date of Construction or Acquisition |  | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,939,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,599,000 |  |  |  |  |
Multi-Family Residential [Member] | Villa West - Topeka, KS [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 12,106,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,590,000 |  |
Buildings & Improvements |  |  |  |  | 15,760,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 923,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,876,000 |  |
Buildings & Improvements |  |  |  |  | 16,397,000 |  |
Total |  | 18,273,000 |  |  | 18,273,000 |  |
Accumulated Depreciation |  | $ (1,331,000) |  |  | (1,331,000) |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 18,273,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,331,000 |  |  |  |  |
Multi-Family Residential [Member] | Village Green - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,047,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 234,000 |  |
Buildings & Improvements |  |  |  |  | 2,296,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 962,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 359,000 |  |
Buildings & Improvements |  |  |  |  | 3,133,000 |  |
Total |  | 3,492,000 |  |  | 3,492,000 |  |
Accumulated Depreciation |  | $ (935,000) |  |  | (935,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,492,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 935,000 |  |  |  |  |
Multi-Family Residential [Member] | West Stonehill - Waite Park, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 8,448,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 939,000 |  |
Buildings & Improvements |  |  |  |  | 10,167,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 5,224,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,533,000 |  |
Buildings & Improvements |  |  |  |  | 14,797,000 |  |
Total |  | 16,330,000 |  |  | 16,330,000 |  |
Accumulated Depreciation |  | $ (6,896,000) |  |  | (6,896,000) |  |
Date of Construction or Acquisition |  | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 16,330,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 6,896,000 |  |  |  |  |
Multi-Family Residential [Member] | Westridge - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,604,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 68,000 |  |
Buildings & Improvements |  |  |  |  | 1,887,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 263,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 77,000 |  |
Buildings & Improvements |  |  |  |  | 2,141,000 |  |
Total |  | 2,218,000 |  |  | 2,218,000 |  |
Accumulated Depreciation |  | $ (377,000) |  |  | (377,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,218,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 377,000 |  |  |  |  |
Multi-Family Residential [Member] | Westwood Park - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,950,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 116,000 |  |
Buildings & Improvements |  |  |  |  | 1,909,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,784,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 284,000 |  |
Buildings & Improvements |  |  |  |  | 3,525,000 |  |
Total |  | 3,809,000 |  |  | 3,809,000 |  |
Accumulated Depreciation |  | $ (1,425,000) |  |  | (1,425,000) |  |
Date of Construction or Acquisition |  | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,809,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,425,000 |  |  |  |  |
Multi-Family Residential [Member] | Whispering Ridge - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 22,000,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,139,000 |  |
Buildings & Improvements |  |  |  |  | 25,424,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 732,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,276,000 |  |
Buildings & Improvements |  |  |  |  | 26,019,000 |  |
Total |  | 28,295,000 |  |  | 28,295,000 |  |
Accumulated Depreciation |  | $ (1,563,000) |  |  | (1,563,000) |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 28,295,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,563,000 |  |  |  |  |
Multi-Family Residential [Member] | Williston Garden - Williston, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 10,870,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,400,000 |  |
Buildings & Improvements |  |  |  |  | 17,696,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 85,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,421,000 |  |
Buildings & Improvements |  |  |  |  | 17,760,000 |  |
Total |  | 19,181,000 |  |  | 19,181,000 |  |
Accumulated Depreciation |  | $ (2,132,000) |  |  | (2,132,000) |  |
Date of Construction or Acquisition |  | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 19,181,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,132,000 |  |  |  |  |
Multi-Family Residential [Member] | Winchester - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,564,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 748,000 |  |
Buildings & Improvements |  |  |  |  | 5,622,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,846,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,009,000 |  |
Buildings & Improvements |  |  |  |  | 7,207,000 |  |
Total |  | 8,216,000 |  |  | 8,216,000 |  |
Accumulated Depreciation |  | $ (2,297,000) |  |  | (2,297,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,216,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,297,000 |  |  |  |  |
Multi-Family Residential [Member] | Woodridge - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 6,257,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 370,000 |  |
Buildings & Improvements |  |  |  |  | 6,028,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,207,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 642,000 |  |
Buildings & Improvements |  |  |  |  | 7,963,000 |  |
Total |  | 8,605,000 |  |  | 8,605,000 |  |
Accumulated Depreciation |  | $ (3,557,000) |  |  | (3,557,000) |  |
Date of Construction or Acquisition |  | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,605,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,557,000 |  |  |  |  |
Multi-Family Residential [Member] | Renaissance Heights - Williston ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,464,000 |  |
Buildings & Improvements |  |  |  |  | 43,488,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 123,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,467,000 |  |
Buildings & Improvements |  |  |  |  | 43,608,000 |  |
Total |  | 46,075,000 |  |  | 46,075,000 |  |
Accumulated Depreciation |  | $ (848,000) |  |  | (848,000) |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 46,075,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 848,000 |  |  |  |  |
Multi-Family Residential [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Additions |  | 183,114,000 | 84,117,000 | 113,859,000 |  |  |
Commercial Healthcare [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 220,070,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 33,522,000 |  |
Buildings & Improvements |  |  |  |  | 409,346,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 52,153,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 34,201,000 |  |
Buildings & Improvements |  |  |  |  | 460,820,000 |  |
Total |  | 495,021,000 |  |  | 495,021,000 |  |
Accumulated Depreciation |  | (112,515,000) |  |  | (112,515,000) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 495,021,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 112,515,000 |  |  |  |  |
Commercial Healthcare [Member] | 2800 Medical Building - Minneapolis, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 7,740,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 204,000 |  |
Buildings & Improvements |  |  |  |  | 7,135,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,492,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 229,000 |  |
Buildings & Improvements |  |  |  |  | 9,602,000 |  |
Total |  | 9,831,000 |  |  | 9,831,000 |  |
Accumulated Depreciation |  | $ (3,037,000) |  |  | (3,037,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,831,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,037,000 |  |  |  |  |
Commercial Healthcare [Member] | 2828 Chicago Avenue - Minneapolis, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 12,105,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 726,000 |  |
Buildings & Improvements |  |  |  |  | 11,319,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 5,627,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 729,000 |  |
Buildings & Improvements |  |  |  |  | 16,943,000 |  |
Total |  | 17,672,000 |  |  | 17,672,000 |  |
Accumulated Depreciation |  | $ (4,011,000) |  |  | (4,011,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 17,672,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,011,000 |  |  |  |  |
Commercial Healthcare [Member] | Airport Medical - Bloomington, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 431,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 4,678,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 4,678,000 |  |
Total |  | 4,678,000 |  |  | 4,678,000 |  |
Accumulated Depreciation |  | $ (1,730,000) |  |  | (1,730,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 4,678,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,730,000 |  |  |  |  |
Commercial Healthcare [Member] | Billings 2300 Grant Road - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,226,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 649,000 |  |
Buildings & Improvements |  |  |  |  | 1,216,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 649,000 |  |
Buildings & Improvements |  |  |  |  | 1,216,000 |  |
Total |  | 1,865,000 |  |  | 1,865,000 |  |
Accumulated Depreciation |  | $ (146,000) |  |  | (146,000) |  |
Date of Construction or Acquisition |  | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,865,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 146,000 |  |  |  |  |
Commercial Healthcare [Member] | Burnsville 303 Nicollet Medical (Ridgeview) - Burnsville, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 8,092,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,071,000 |  |
Buildings & Improvements |  |  |  |  | 6,842,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,968,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,092,000 |  |
Buildings & Improvements |  |  |  |  | 8,789,000 |  |
Total |  | 9,881,000 |  |  | 9,881,000 |  |
Accumulated Depreciation |  | $ (1,612,000) |  |  | (1,612,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,881,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,612,000 |  |  |  |  |
Commercial Healthcare [Member] | Burnsville 305 Nicollet Medical (Ridgeview South) - Burnsville, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 5,066,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 189,000 |  |
Buildings & Improvements |  |  |  |  | 5,127,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 971,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 203,000 |  |
Buildings & Improvements |  |  |  |  | 6,084,000 |  |
Total |  | 6,287,000 |  |  | 6,287,000 |  |
Accumulated Depreciation |  | $ (1,078,000) |  |  | (1,078,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 6,287,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,078,000 |  |  |  |  |
Commercial Healthcare [Member] | Casper 1930 E 12th Street (Park Place) - Casper, WY [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1],[6] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 439,000 |  |
Buildings & Improvements | [6] |  |  |  | 5,780,000 |  |
Costs capitalized subsequent to acquisition | [6] |  |  |  | 172,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 439,000 |  |
Buildings & Improvements | [6] |  |  |  | 5,952,000 |  |
Total | [6] | 6,391,000 |  |  | 6,391,000 |  |
Accumulated Depreciation | [6] | $ (855,000) |  |  | (855,000) |  |
Date of Construction or Acquisition | [6] | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | [6] | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | $ 6,391,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | 855,000 |  |  |  |  |
Commercial Healthcare [Member] | Casper 3955 E 12th Street (Meadow Wind) - Casper, WY [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1],[6] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 388,000 |  |
Buildings & Improvements | [6] |  |  |  | 10,494,000 |  |
Costs capitalized subsequent to acquisition | [6] |  |  |  | 576,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 459,000 |  |
Buildings & Improvements | [6] |  |  |  | 10,999,000 |  |
Total | [6] | 11,458,000 |  |  | 11,458,000 |  |
Accumulated Depreciation | [6] | $ (1,510,000) |  |  | (1,510,000) |  |
Date of Construction or Acquisition | [6] | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | [6] | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | $ 11,458,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | 1,510,000 |  |  |  |  |
Commercial Healthcare [Member] | Cheyenne 4010 N College Drive (Aspen Wind) - Cheyenne, WY [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1],[6] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 628,000 |  |
Buildings & Improvements | [6] |  |  |  | 10,272,000 |  |
Costs capitalized subsequent to acquisition | [6] |  |  |  | 270,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 629,000 |  |
Buildings & Improvements | [6] |  |  |  | 10,541,000 |  |
Total | [6] | 11,170,000 |  |  | 11,170,000 |  |
Accumulated Depreciation | [6] | $ (1,457,000) |  |  | (1,457,000) |  |
Date of Construction or Acquisition | [6] | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | [6] | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | $ 11,170,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | 1,457,000 |  |  |  |  |
Commercial Healthcare [Member] | Cheyenne 4606 N College Drive (Sierra Hills) - Cheyenne, WY [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1],[6] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 695,000 |  |
Buildings & Improvements | [6] |  |  |  | 7,455,000 |  |
Costs capitalized subsequent to acquisition | [6] |  |  |  | 50,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 695,000 |  |
Buildings & Improvements | [6] |  |  |  | 7,505,000 |  |
Total | [6] | 8,200,000 |  |  | 8,200,000 |  |
Accumulated Depreciation | [6] | $ (1,020,000) |  |  | (1,020,000) |  |
Date of Construction or Acquisition | [6] | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | [6] | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | $ 8,200,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | 1,020,000 |  |  |  |  |
Commercial Healthcare [Member] | Denfeld Clinic - Duluth, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,430,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 501,000 |  |
Buildings & Improvements |  |  |  |  | 2,597,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 501,000 |  |
Buildings & Improvements |  |  |  |  | 2,598,000 |  |
Total |  | 3,099,000 |  |  | 3,099,000 |  |
Accumulated Depreciation |  | $ (718,000) |  |  | (718,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,099,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 718,000 |  |  |  |  |
Commercial Healthcare [Member] | Eagan 1440 Duckwood Medical - Eagan, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 521,000 |  |
Buildings & Improvements |  |  |  |  | 1,547,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 556,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 521,000 |  |
Buildings & Improvements |  |  |  |  | 2,103,000 |  |
Total |  | 2,624,000 |  |  | 2,624,000 |  |
Accumulated Depreciation |  | $ (635,000) |  |  | (635,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,624,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 635,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Belgrade, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 35,000 |  |
Buildings & Improvements |  |  |  |  | 779,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 21,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 35,000 |  |
Buildings & Improvements |  |  |  |  | 800,000 |  |
Total |  | 835,000 |  |  | 835,000 |  |
Accumulated Depreciation |  | $ (140,000) |  |  | (140,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 835,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 140,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,785,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 115,000 |  |
Buildings & Improvements |  |  |  |  | 1,767,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 66,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 115,000 |  |
Buildings & Improvements |  |  |  |  | 1,833,000 |  |
Total |  | 1,948,000 |  |  | 1,948,000 |  |
Accumulated Depreciation |  | $ (323,000) |  |  | (323,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,948,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 323,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 511,000 |  |
Buildings & Improvements |  |  |  |  | 9,193,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 177,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 511,000 |  |
Buildings & Improvements |  |  |  |  | 9,370,000 |  |
Total |  | 9,881,000 |  |  | 9,881,000 |  |
Accumulated Depreciation |  | $ (2,231,000) |  |  | (2,231,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,881,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,231,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Brainerd, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 587,000 |  |
Buildings & Improvements |  |  |  |  | 8,999,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 134,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 587,000 |  |
Buildings & Improvements |  |  |  |  | 9,133,000 |  |
Total |  | 9,720,000 |  |  | 9,720,000 |  |
Accumulated Depreciation |  | $ (2,184,000) |  |  | (2,184,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,720,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,184,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Columbus, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 43,000 |  |
Buildings & Improvements |  |  |  |  | 824,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 24,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 44,000 |  |
Buildings & Improvements |  |  |  |  | 847,000 |  |
Total |  | 891,000 |  |  | 891,000 |  |
Accumulated Depreciation |  | $ (148,000) |  |  | (148,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 891,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 148,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - East Grand Forks, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,718,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 290,000 |  |
Buildings & Improvements |  |  |  |  | 1,352,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 59,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 290,000 |  |
Buildings & Improvements |  |  |  |  | 1,411,000 |  |
Total |  | 1,701,000 |  |  | 1,701,000 |  |
Accumulated Depreciation |  | $ (251,000) |  |  | (251,000) |  |
Date of Construction or Acquisition |  | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,701,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 251,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Fargo, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 11,846,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 775,000 |  |
Buildings & Improvements |  |  |  |  | 20,870,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 199,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 775,000 |  |
Buildings & Improvements |  |  |  |  | 21,069,000 |  |
Total |  | 21,844,000 |  |  | 21,844,000 |  |
Accumulated Depreciation |  | $ (3,730,000) |  |  | (3,730,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 21,844,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,730,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Fremont, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 550,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 56,000 |  |
Buildings & Improvements |  |  |  |  | 490,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 54,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 56,000 |  |
Buildings & Improvements |  |  |  |  | 544,000 |  |
Total |  | 600,000 |  |  | 600,000 |  |
Accumulated Depreciation |  | $ (179,000) |  |  | (179,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 600,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 179,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Grand Island, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 33,000 |  |
Buildings & Improvements |  |  |  |  | 773,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 51,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 39,000 |  |
Buildings & Improvements |  |  |  |  | 818,000 |  |
Total |  | 857,000 |  |  | 857,000 |  |
Accumulated Depreciation |  | $ (142,000) |  |  | (142,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 857,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 142,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Hastings, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 567,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 49,000 |  |
Buildings & Improvements |  |  |  |  | 517,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 63,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 50,000 |  |
Buildings & Improvements |  |  |  |  | 579,000 |  |
Total |  | 629,000 |  |  | 629,000 |  |
Accumulated Depreciation |  | $ (197,000) |  |  | (197,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 629,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 197,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Hermantown I, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 15,197,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 288,000 |  |
Buildings & Improvements |  |  |  |  | 9,871,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,761,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 288,000 |  |
Buildings & Improvements |  |  |  |  | 11,632,000 |  |
Total |  | 11,920,000 |  |  | 11,920,000 |  |
Accumulated Depreciation |  | $ (3,888,000) |  |  | (3,888,000) |  |
Date of Construction or Acquisition |  | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 11,920,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,888,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Hermantown II, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 719,000 |  |
Buildings & Improvements |  |  |  |  | 10,517,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 121,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 719,000 |  |
Buildings & Improvements |  |  |  |  | 10,638,000 |  |
Total |  | 11,357,000 |  |  | 11,357,000 |  |
Accumulated Depreciation |  | $ (2,542,000) |  |  | (2,542,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 11,357,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,542,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Kalispell, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 568,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 70,000 |  |
Buildings & Improvements |  |  |  |  | 502,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 633,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 70,000 |  |
Buildings & Improvements |  |  |  |  | 1,135,000 |  |
Total |  | 1,205,000 |  |  | 1,205,000 |  |
Accumulated Depreciation |  | $ (364,000) |  |  | (364,000) |  |
Date of Construction or Acquisition |  | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,205,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 364,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 9,017,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,045,000 |  |
Buildings & Improvements |  |  |  |  | 11,590,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 210,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,047,000 |  |
Buildings & Improvements |  |  |  |  | 11,798,000 |  |
Total |  | 12,845,000 |  |  | 12,845,000 |  |
Accumulated Depreciation |  | $ (1,307,000) |  |  | (1,307,000) |  |
Date of Construction or Acquisition |  | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 12,845,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,307,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Missoula, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 807,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 109,000 |  |
Buildings & Improvements |  |  |  |  | 854,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 94,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 116,000 |  |
Buildings & Improvements |  |  |  |  | 941,000 |  |
Total |  | 1,057,000 |  |  | 1,057,000 |  |
Accumulated Depreciation |  | $ (412,000) |  |  | (412,000) |  |
Date of Construction or Acquisition |  | 1996 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,057,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 412,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Norfolk, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 42,000 |  |
Buildings & Improvements |  |  |  |  | 722,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 22,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 42,000 |  |
Buildings & Improvements |  |  |  |  | 744,000 |  |
Total |  | 786,000 |  |  | 786,000 |  |
Accumulated Depreciation |  | $ (131,000) |  |  | (131,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 786,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 131,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 359,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 89,000 |  |
Buildings & Improvements |  |  |  |  | 547,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 53,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 89,000 |  |
Buildings & Improvements |  |  |  |  | 600,000 |  |
Total |  | 689,000 |  |  | 689,000 |  |
Accumulated Depreciation |  | $ (201,000) |  |  | (201,000) |  |
Date of Construction or Acquisition |  | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 689,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 201,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Sioux Falls, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,022,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 314,000 |  |
Buildings & Improvements |  |  |  |  | 974,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 58,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 314,000 |  |
Buildings & Improvements |  |  |  |  | 1,032,000 |  |
Total |  | 1,346,000 |  |  | 1,346,000 |  |
Accumulated Depreciation |  | $ (185,000) |  |  | (185,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,346,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 185,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Spearfish, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 315,000 |  |
Buildings & Improvements |  |  |  |  | 8,584,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 124,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 330,000 |  |
Buildings & Improvements |  |  |  |  | 8,693,000 |  |
Total |  | 9,023,000 |  |  | 9,023,000 |  |
Accumulated Depreciation |  | $ (1,710,000) |  |  | (1,710,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,023,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,710,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Virginia, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 12,927,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 246,000 |  |
Buildings & Improvements |  |  |  |  | 11,823,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 313,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 246,000 |  |
Buildings & Improvements |  |  |  |  | 12,136,000 |  |
Total |  | 12,382,000 |  |  | 12,382,000 |  |
Accumulated Depreciation |  | $ (3,669,000) |  |  | (3,669,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 12,382,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,669,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6363 France Medical - Edina, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 9,567,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 12,675,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,906,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 15,581,000 |  |
Total |  | 15,581,000 |  |  | 15,581,000 |  |
Accumulated Depreciation |  | $ (3,781,000) |  |  | (3,781,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 15,581,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,781,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6405 France Medical - Edina, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 8,145,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 12,201,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 41,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 12,242,000 |  |
Total |  | 12,242,000 |  |  | 12,242,000 |  |
Accumulated Depreciation |  | $ (2,969,000) |  |  | (2,969,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 12,242,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,969,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6517 Drew Avenue - Edina, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 353,000 |  |
Buildings & Improvements |  |  |  |  | 660,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 529,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 372,000 |  |
Buildings & Improvements |  |  |  |  | 1,170,000 |  |
Total |  | 1,542,000 |  |  | 1,542,000 |  |
Accumulated Depreciation |  | $ (579,000) |  |  | (579,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,542,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 579,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6525 Drew Avenue - Edina, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 388,000 |  |
Buildings & Improvements |  |  |  |  | 117,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 388,000 |  |
Buildings & Improvements |  |  |  |  | 117,000 |  |
Total |  | 505,000 |  |  | 505,000 |  |
Accumulated Depreciation |  | $ (10,000) |  |  | (10,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 505,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 10,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6525 France SMC II - Edina, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 9,803,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 755,000 |  |
Buildings & Improvements |  |  |  |  | 8,054,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 5,723,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,040,000 |  |
Buildings & Improvements |  |  |  |  | 13,492,000 |  |
Total |  | 14,532,000 |  |  | 14,532,000 |  |
Accumulated Depreciation |  | $ (5,874,000) |  |  | (5,874,000) |  |
Date of Construction or Acquisition |  | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 14,532,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 5,874,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6545 France SMC I - Edina MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 29,622,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,480,000 |  |
Buildings & Improvements |  |  |  |  | 30,192,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 14,423,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,480,000 |  |
Buildings & Improvements |  |  |  |  | 44,615,000 |  |
Total |  | 48,095,000 |  |  | 48,095,000 |  |
Accumulated Depreciation |  | $ (17,035,000) |  |  | (17,035,000) |  |
Date of Construction or Acquisition |  | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 48,095,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 17,035,000 |  |  |  |  |
Commercial Healthcare [Member] | Fresenius - Duluth, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 576,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 50,000 |  |
Buildings & Improvements |  |  |  |  | 1,520,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 50,000 |  |
Buildings & Improvements |  |  |  |  | 1,522,000 |  |
Total |  | 1,572,000 |  |  | 1,572,000 |  |
Accumulated Depreciation |  | $ (420,000) |  |  | (420,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,572,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 420,000 |  |  |  |  |
Commercial Healthcare [Member] | Garden View - St. Paul, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 7,408,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 898,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 26,000 |  |
Buildings & Improvements |  |  |  |  | 8,280,000 |  |
Total |  | 8,306,000 |  |  | 8,306,000 |  |
Accumulated Depreciation |  | $ (2,723,000) |  |  | (2,723,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,306,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,723,000 |  |  |  |  |
Commercial Healthcare [Member] | Gateway Clinic - Sandstone, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 828,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 66,000 |  |
Buildings & Improvements |  |  |  |  | 1,699,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 66,000 |  |
Buildings & Improvements |  |  |  |  | 1,699,000 |  |
Total |  | 1,765,000 |  |  | 1,765,000 |  |
Accumulated Depreciation |  | $ (469,000) |  |  | (469,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,765,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 469,000 |  |  |  |  |
Commercial Healthcare [Member] | Healtheast St John & Woodwinds - Maplewood & Woodbury, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 7,366,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,239,000 |  |
Buildings & Improvements |  |  |  |  | 18,362,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,239,000 |  |
Buildings & Improvements |  |  |  |  | 18,362,000 |  |
Total |  | 21,601,000 |  |  | 21,601,000 |  |
Accumulated Depreciation |  | $ (6,867,000) |  |  | (6,867,000) |  |
Date of Construction or Acquisition |  | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 21,601,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 6,867,000 |  |  |  |  |
Commercial Healthcare [Member] | High Pointe Health Campus - Lake Elmo, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 7,500,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,305,000 |  |
Buildings & Improvements |  |  |  |  | 10,528,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,091,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,329,000 |  |
Buildings & Improvements |  |  |  |  | 12,595,000 |  |
Total |  | 13,924,000 |  |  | 13,924,000 |  |
Accumulated Depreciation |  | $ (3,750,000) |  |  | (3,750,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 13,924,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 3,750,000 |  |  |  |  |
Commercial Healthcare [Member] | Laramie 1072 N 22nd Street (Spring Wind) - Laramie, WY [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1],[6] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 406,000 |  |
Buildings & Improvements | [6] |  |  |  | 10,151,000 |  |
Costs capitalized subsequent to acquisition | [6] |  |  |  | 27,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 406,000 |  |
Buildings & Improvements | [6] |  |  |  | 10,178,000 |  |
Total | [6] | 10,584,000 |  |  | 10,584,000 |  |
Accumulated Depreciation | [6] | $ (1,251,000) |  |  | (1,251,000) |  |
Date of Construction or Acquisition | [6] | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | [6] | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | $ 10,584,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | 1,251,000 |  |  |  |  |
Commercial Healthcare [Member] | Legends at Heritage Place - Sartell, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 970,000 |  |
Buildings & Improvements |  |  |  |  | 9,920,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 970,000 |  |
Buildings & Improvements |  |  |  |  | 9,920,000 |  |
Total |  | 10,890,000 |  |  | 10,890,000 |  |
Accumulated Depreciation |  | $ (382,000) |  |  | (382,000) |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 10,890,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 382,000 |  |  |  |  |
Commercial Healthcare [Member] | Mariner Clinic - Superior, WI [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,811,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 3,781,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 90,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 20,000 |  |
Buildings & Improvements |  |  |  |  | 3,851,000 |  |
Total |  | 3,871,000 |  |  | 3,871,000 |  |
Accumulated Depreciation |  | $ (1,077,000) |  |  | (1,077,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,871,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,077,000 |  |  |  |  |
Commercial Healthcare [Member] | Minneapolis 701 25th Avenue Medical - Minneapolis, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 7,196,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 7,873,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,566,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 9,439,000 |  |
Total |  | 9,439,000 |  |  | 9,439,000 |  |
Accumulated Depreciation |  | $ (1,837,000) |  |  | (1,837,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,439,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,837,000 |  |  |  |  |
Commercial Healthcare [Member] | Missoula 3050 Great Northern - Missoula, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,267,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 640,000 |  |
Buildings & Improvements |  |  |  |  | 1,331,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 640,000 |  |
Buildings & Improvements |  |  |  |  | 1,331,000 |  |
Total |  | 1,971,000 |  |  | 1,971,000 |  |
Accumulated Depreciation |  | $ (159,000) |  |  | (159,000) |  |
Date of Construction or Acquisition |  | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,971,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 159,000 |  |  |  |  |
Commercial Healthcare [Member] | Park Dental - Brooklyn Center, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 247,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 185,000 |  |
Buildings & Improvements |  |  |  |  | 2,767,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 185,000 |  |
Buildings & Improvements |  |  |  |  | 2,767,000 |  |
Total |  | 2,952,000 |  |  | 2,952,000 |  |
Accumulated Depreciation |  | $ (873,000) |  |  | (873,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,952,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 873,000 |  |  |  |  |
Commercial Healthcare [Member] | Pavilion I - Duluth, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 4,773,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,245,000 |  |
Buildings & Improvements |  |  |  |  | 8,898,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 31,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,245,000 |  |
Buildings & Improvements |  |  |  |  | 8,929,000 |  |
Total |  | 10,174,000 |  |  | 10,174,000 |  |
Accumulated Depreciation |  | $ (2,445,000) |  |  | (2,445,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 10,174,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,445,000 |  |  |  |  |
Commercial Healthcare [Member] | Pavilion II - Duluth, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 8,783,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,715,000 |  |
Buildings & Improvements |  |  |  |  | 14,673,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,937,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 2,715,000 |  |
Buildings & Improvements |  |  |  |  | 16,610,000 |  |
Total |  | 19,325,000 |  |  | 19,325,000 |  |
Accumulated Depreciation |  | $ (5,788,000) |  |  | (5,788,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 19,325,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 5,788,000 |  |  |  |  |
Commercial Healthcare [Member] | Ritchie Medical Plaza - St Paul, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 5,980,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,615,000 |  |
Buildings & Improvements |  |  |  |  | 7,851,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,611,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,647,000 |  |
Buildings & Improvements |  |  |  |  | 11,430,000 |  |
Total |  | 13,077,000 |  |  | 13,077,000 |  |
Accumulated Depreciation |  | $ (2,880,000) |  |  | (2,880,000) |  |
Date of Construction or Acquisition |  | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 13,077,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,880,000 |  |  |  |  |
Commercial Healthcare [Member] | Sartell 2000 23rd Street South - Sartell, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,593,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 11,781,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 934,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |
Buildings & Improvements |  |  |  |  | 12,715,000 |  |
Total |  | 12,715,000 |  |  | 12,715,000 |  |
Accumulated Depreciation |  | $ (4,101,000) |  |  | (4,101,000) |  |
Date of Construction or Acquisition |  | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 12,715,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 4,101,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek American Falls- American Falls, ID [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,086,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 145,000 |  |
Buildings & Improvements |  |  |  |  | 3,870,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 145,000 |  |
Buildings & Improvements |  |  |  |  | 3,870,000 |  |
Total |  | 4,015,000 |  |  | 4,015,000 |  |
Accumulated Depreciation |  | $ (404,000) |  |  | (404,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 4,015,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 404,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Boise - Boise, ID [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 2,751,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 708,000 |  |
Buildings & Improvements |  |  |  |  | 4,296,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 708,000 |  |
Buildings & Improvements |  |  |  |  | 4,296,000 |  |
Total |  | 5,004,000 |  |  | 5,004,000 |  |
Accumulated Depreciation |  | $ (482,000) |  |  | (482,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,004,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 482,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Eagle - Eagle, ID [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,919,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 263,000 |  |
Buildings & Improvements |  |  |  |  | 3,775,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 263,000 |  |
Buildings & Improvements |  |  |  |  | 3,775,000 |  |
Total |  | 4,038,000 |  |  | 4,038,000 |  |
Accumulated Depreciation |  | $ (396,000) |  |  | (396,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 4,038,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 396,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek Fruitland - Fruitland, ID [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 550,000 |  |
Buildings & Improvements |  |  |  |  | 6,565,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 550,000 |  |
Buildings & Improvements |  |  |  |  | 6,565,000 |  |
Total |  | 7,115,000 |  |  | 7,115,000 |  |
Accumulated Depreciation |  | $ (260,000) |  |  | (260,000) |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,115,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 260,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Meridian - Meridian, ID [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,171,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 424,000 |  |
Buildings & Improvements |  |  |  |  | 6,724,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 424,000 |  |
Buildings & Improvements |  |  |  |  | 6,724,000 |  |
Total |  | 7,148,000 |  |  | 7,148,000 |  |
Accumulated Depreciation |  | $ (698,000) |  |  | (698,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,148,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 698,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Overland - Overland, ID [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 3,106,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 687,000 |  |
Buildings & Improvements |  |  |  |  | 5,942,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 687,000 |  |
Buildings & Improvements |  |  |  |  | 5,942,000 |  |
Total |  | 6,629,000 |  |  | 6,629,000 |  |
Accumulated Depreciation |  | $ (644,000) |  |  | (644,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 6,629,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 644,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Soda Springs - Soda Springs, ID [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 751,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 66,000 |  |
Buildings & Improvements |  |  |  |  | 2,124,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 33,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 66,000 |  |
Buildings & Improvements |  |  |  |  | 2,157,000 |  |
Total |  | 2,223,000 |  |  | 2,223,000 |  |
Accumulated Depreciation |  | $ (228,000) |  |  | (228,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,223,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 228,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Ustick - Meridian, ID [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 467,000 |  |
Buildings & Improvements |  |  |  |  | 3,833,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 467,000 |  |
Buildings & Improvements |  |  |  |  | 3,833,000 |  |
Total |  | 4,300,000 |  |  | 4,300,000 |  |
Accumulated Depreciation |  | $ (370,000) |  |  | (370,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 4,300,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 370,000 |  |  |  |  |
Commercial Healthcare [Member] | St Michael Clinic - St Michael, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,795,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 328,000 |  |
Buildings & Improvements |  |  |  |  | 2,259,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 264,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 328,000 |  |
Buildings & Improvements |  |  |  |  | 2,523,000 |  |
Total |  | 2,851,000 |  |  | 2,851,000 |  |
Accumulated Depreciation |  | $ (510,000) |  |  | (510,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,851,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 510,000 |  |  |  |  |
Commercial Healthcare [Member] | Trinity at Plaza 16 - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 4,718,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 568,000 |  |
Buildings & Improvements |  |  |  |  | 9,009,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 125,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 674,000 |  |
Buildings & Improvements |  |  |  |  | 9,028,000 |  |
Total |  | 9,702,000 |  |  | 9,702,000 |  |
Accumulated Depreciation |  | $ (820,000) |  |  | (820,000) |  |
Date of Construction or Acquisition |  | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,702,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 820,000 |  |  |  |  |
Commercial Healthcare [Member] | Wells Clinic - Hibbing, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,263,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 162,000 |  |
Buildings & Improvements |  |  |  |  | 2,497,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 162,000 |  |
Buildings & Improvements |  |  |  |  | 2,499,000 |  |
Total |  | 2,661,000 |  |  | 2,661,000 |  |
Accumulated Depreciation |  | $ (690,000) |  |  | (690,000) |  |
Date of Construction or Acquisition |  | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,661,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 690,000 |  |  |  |  |
Commercial Healthcare [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Additions |  | 0 | 18,005,000 | 11,122,000 |  |  |
Industrial [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 12,404,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 9,040,000 |  |
Buildings & Improvements |  |  |  |  | 43,081,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 8,490,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 9,336,000 |  |
Buildings & Improvements |  |  |  |  | 51,275,000 |  |
Total |  | 60,611,000 |  |  | 60,611,000 |  |
Accumulated Depreciation |  | (11,256,000) |  |  | (11,256,000) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 60,611,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 11,256,000 |  |  |  |  |
Industrial [Member] | Bloomington 2000 W 94th Street - Bloomington, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1],[6] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 2,133,000 |  |
Buildings & Improvements | [6] |  |  |  | 4,097,000 |  |
Costs capitalized subsequent to acquisition | [6] |  |  |  | 1,217,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 2,204,000 |  |
Buildings & Improvements | [6] |  |  |  | 5,243,000 |  |
Total | [6] | 7,447,000 |  |  | 7,447,000 |  |
Accumulated Depreciation | [6] | $ (1,423,000) |  |  | (1,423,000) |  |
Date of Construction or Acquisition | [6] | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | [6] | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | $ 7,447,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | 1,423,000 |  |  |  |  |
Industrial [Member] | Lexington Commerce Center - Eagan, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 1,604,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 453,000 |  |
Buildings & Improvements |  |  |  |  | 4,352,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,977,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 480,000 |  |
Buildings & Improvements |  |  |  |  | 6,302,000 |  |
Total |  | 6,782,000 |  |  | 6,782,000 |  |
Accumulated Depreciation |  | $ (2,831,000) |  |  | (2,831,000) |  |
Date of Construction or Acquisition |  | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 6,782,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,831,000 |  |  |  |  |
Industrial [Member] | Minot IPS - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1],[6] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 416,000 |  |
Buildings & Improvements | [6] |  |  |  | 5,952,000 |  |
Costs capitalized subsequent to acquisition | [6] |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land | [6] |  |  |  | 416,000 |  |
Buildings & Improvements | [6] |  |  |  | 5,952,000 |  |
Total | [6] | 6,368,000 |  |  | 6,368,000 |  |
Accumulated Depreciation | [6] | $ (374,000) |  |  | (374,000) |  |
Date of Construction or Acquisition | [6] | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | [6] | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | $ 6,368,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | [6] | 374,000 |  |  |  |  |
Industrial [Member] | Stone Container - Fargo, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 382,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 440,000 |  |
Buildings & Improvements |  |  |  |  | 6,597,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 104,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 440,000 |  |
Buildings & Improvements |  |  |  |  | 6,701,000 |  |
Total |  | 7,141,000 |  |  | 7,141,000 |  |
Accumulated Depreciation |  | $ (2,943,000) |  |  | (2,943,000) |  |
Date of Construction or Acquisition |  | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 7,141,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,943,000 |  |  |  |  |
Industrial [Member] | Roseville 3075 Long Lake Road - Roseville, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 810,000 |  |
Buildings & Improvements |  |  |  |  | 9,562,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,326,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 810,000 |  |
Buildings & Improvements |  |  |  |  | 10,888,000 |  |
Total |  | 11,698,000 |  |  | 11,698,000 |  |
Accumulated Depreciation |  | $ (145,000) |  |  | (145,000) |  |
Date of Construction or Acquisition |  | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 11,698,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 145,000 |  |  |  |  |
Industrial [Member] | Urbandale 3900 106th Street - Urbandale, IA [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 10,418,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,680,000 |  |
Buildings & Improvements |  |  |  |  | 9,893,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,982,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,863,000 |  |
Buildings & Improvements |  |  |  |  | 11,692,000 |  |
Total |  | 15,555,000 |  |  | 15,555,000 |  |
Accumulated Depreciation |  | $ (2,553,000) |  |  | (2,553,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 15,555,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,553,000 |  |  |  |  |
Industrial [Member] | Woodbury 1865 Woodlane - Woodbury, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,108,000 |  |
Buildings & Improvements |  |  |  |  | 2,628,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,884,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,123,000 |  |
Buildings & Improvements |  |  |  |  | 4,497,000 |  |
Total |  | 5,620,000 |  |  | 5,620,000 |  |
Accumulated Depreciation |  | $ (987,000) |  |  | (987,000) |  |
Date of Construction or Acquisition |  | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 5,620,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 987,000 |  |  |  |  |
Industrial [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Additions |  | 9,037,000 | 0 | 5,900,000 |  |  |
Other Property [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 11,685,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 3,640,000 |  |
Buildings & Improvements |  |  |  |  | 24,933,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 15,642,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 4,057,000 |  |
Buildings & Improvements |  |  |  |  | 40,158,000 |  |
Total |  | 44,215,000 |  |  | 44,215,000 |  |
Accumulated Depreciation |  | (9,123,000) |  |  | (9,123,000) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 44,215,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 9,123,000 |  |  |  |  |
Other Property [Member] | 1st Avenue Building - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 30,000 |  |
Buildings & Improvements |  |  |  |  | 337,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 30,000 |  |
Buildings & Improvements |  |  |  |  | 337,000 |  |
Total |  | 367,000 |  |  | 367,000 |  |
Accumulated Depreciation |  | $ (41,000) |  |  | (41,000) |  |
Date of Construction or Acquisition |  | 1981 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 367,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 41,000 |  |  |  |  |
Other Property [Member] | 1st Avenue Building - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 33 years |  |  |  |  |
Other Property [Member] | 1st Avenue Building - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Other Property [Member] | Bismarck 715 East Broadway - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 2,103,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 389,000 |  |
Buildings & Improvements |  |  |  |  | 1,283,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,126,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 443,000 |  |
Buildings & Improvements |  |  |  |  | 2,355,000 |  |
Total |  | $ 2,798,000 |  |  | 2,798,000 |  |
Accumulated Depreciation |  | $ (458,000) |  |  | (458,000) |  |
Date of Construction or Acquisition |  | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,798,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 458,000 |  |  |  |  |
Other Property [Member] | Minot 1400 31st Ave - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,026,000 |  |
Buildings & Improvements |  |  |  |  | 6,143,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,404,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 1,038,000 |  |
Buildings & Improvements |  |  |  |  | 10,535,000 |  |
Total |  | 11,573,000 |  |  | 11,573,000 |  |
Accumulated Depreciation |  | $ (2,287,000) |  |  | (2,287,000) |  |
Date of Construction or Acquisition |  | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 11,573,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,287,000 |  |  |  |  |
Other Property [Member] | Minot 2505 16th Street SW - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 298,000 |  |
Buildings & Improvements |  |  |  |  | 1,724,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 296,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 298,000 |  |
Buildings & Improvements |  |  |  |  | 2,020,000 |  |
Total |  | 2,318,000 |  |  | 2,318,000 |  |
Accumulated Depreciation |  | $ (275,000) |  |  | (275,000) |  |
Date of Construction or Acquisition |  | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,318,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 275,000 |  |  |  |  |
Other Property [Member] | Plaza 16 - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 7,098,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 389,000 |  |
Buildings & Improvements |  |  |  |  | 5,444,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,859,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 598,000 |  |
Buildings & Improvements |  |  |  |  | 9,094,000 |  |
Total |  | 9,692,000 |  |  | 9,692,000 |  |
Accumulated Depreciation |  | $ (2,041,000) |  |  | (2,041,000) |  |
Date of Construction or Acquisition |  | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 9,692,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,041,000 |  |  |  |  |
Other Property [Member] | 17 South Main - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 75,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 15,000 |  |
Buildings & Improvements |  |  |  |  | 75,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 197,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 17,000 |  |
Buildings & Improvements |  |  |  |  | 270,000 |  |
Total |  | 287,000 |  |  | 287,000 |  |
Accumulated Depreciation |  | $ (202,000) |  |  | (202,000) |  |
Date of Construction or Acquisition |  | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 287,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 202,000 |  |  |  |  |
Other Property [Member] | Arrowhead First International Bank - Minot ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 75,000 |  |
Buildings & Improvements |  |  |  |  | 1,211,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 20,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 95,000 |  |
Buildings & Improvements |  |  |  |  | 1,211,000 |  |
Total |  | 1,306,000 |  |  | 1,306,000 |  |
Accumulated Depreciation |  | $ (65,000) |  |  | (65,000) |  |
Date of Construction or Acquisition |  | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,306,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 65,000 |  |  |  |  |
Other Property [Member] | Dakota West Plaza - Minot , ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 347,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 92,000 |  |
Buildings & Improvements |  |  |  |  | 493,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 30,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 106,000 |  |
Buildings & Improvements |  |  |  |  | 509,000 |  |
Total |  | 615,000 |  |  | 615,000 |  |
Accumulated Depreciation |  | $ (122,000) |  |  | (122,000) |  |
Date of Construction or Acquisition |  | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 615,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 122,000 |  |  |  |  |
Other Property [Member] | Grand Forks Carmike - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 1,304,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 184,000 |  |
Buildings & Improvements |  |  |  |  | 2,360,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 184,000 |  |
Buildings & Improvements |  |  |  |  | 2,362,000 |  |
Total |  | 2,546,000 |  |  | 2,546,000 |  |
Accumulated Depreciation |  | $ (1,211,000) |  |  | (1,211,000) |  |
Date of Construction or Acquisition |  | 1994 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 2,546,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,211,000 |  |  |  |  |
Other Property [Member] | Minot Arrowhead - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 100,000 |  |
Buildings & Improvements |  |  |  |  | 3,216,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 5,553,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 176,000 |  |
Buildings & Improvements |  |  |  |  | 8,693,000 |  |
Total |  | 8,869,000 |  |  | 8,869,000 |  |
Accumulated Depreciation |  | $ (2,058,000) |  |  | (2,058,000) |  |
Date of Construction or Acquisition |  | 1973 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 8,869,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 2,058,000 |  |  |  |  |
Other Property [Member] | Minot Plaza - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 758,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 50,000 |  |
Buildings & Improvements |  |  |  |  | 453,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 155,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 80,000 |  |
Buildings & Improvements |  |  |  |  | 578,000 |  |
Total |  | 658,000 |  |  | 658,000 |  |
Accumulated Depreciation |  | $ (339,000) |  |  | (339,000) |  |
Date of Construction or Acquisition |  | 1993 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 658,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 339,000 |  |  |  |  |
Other Property [Member] | Minot Southgate Wells Fargo Bank - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 992,000 |  |
Buildings & Improvements |  |  |  |  | 2,194,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 992,000 |  |
Buildings & Improvements |  |  |  |  | 2,194,000 |  |
Total |  | 3,186,000 |  |  | 3,186,000 |  |
Accumulated Depreciation |  | $ (24,000) |  |  | (24,000) |  |
Date of Construction or Acquisition |  | 2014 |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 3,186,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 24,000 |  |  |  |  |
Other Property [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Additions |  | 3,186,000 | $ 0 | $ 1,240,000 |  |  |
Subtotal [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances | [1] |  |  |  | 667,544,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 111,612,000 |  |
Buildings & Improvements |  |  |  |  | 1,223,659,000 |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 211,096,000 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 129,513,000 |  |
Buildings & Improvements |  |  |  |  | 1,416,854,000 |  |
Total |  | 1,546,367,000 |  |  | 1,546,367,000 |  |
Accumulated Depreciation |  | (313,308,000) |  |  | $ (313,308,000) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | 1,546,367,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 313,308,000 |  |  |  |  |
[1] | Amounts in this column are the mortgages payable balances as of April 30, 2015. These amounts do not include amounts owing under the Company's multi-bank line of credit or under the Company's construction loans.
[2] | The net basis of the Company's real estate investments for Federal Income Tax purposes was $1.7 billion, $1.5 billion and $1.5 billion at April 30, 2015, 2014 and 2013, respectively.
[3] | Consists of miscellaneous disposed assets.
[4] | Includes development projects that are placed in service in phases.
[5] | Consists of miscellaneous re-classed assets.
[6] | As of April 30, 2015, this property was included in the collateral pool securing the Company's $90.0 million multi-bank line of credit. The Company may add and remove eligible properties from the collateral pool if certain minimum collateral requirements are satisfied. Advances under the facility may not exceed 60% of the value of properties provided as security.

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