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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) (USD $) | 12 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | $ 997,689,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 219,439,000 |  |  |  |  |
Buildings & Improvements | 1,606,537,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 297,528,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 241,134,000 |  |  |  |  |
Buildings & Improvements | 1,882,370,000 |  |  |  |  |
Total | 2,123,504,000 | [1] |  |  |  |
Accumulated Depreciation | (424,288,000) | [1] |  |  |  |
Maximum borrowing capacity | 72,000,000 |  |  |  |  |
Advances under the facility specified as percentage of value of properties provided as security (in hundredths) | 60.00% |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,123,504,000 | [1] |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 424,288,000 | [1] |  |  |  |
Total real estate investments | 1,699,216,000 |  | 1,680,834,000 | [2] | 1,557,108,000 | [1]
Net basis of real estate investments for federal income tax purposes | 1,500,000,000 |  | 1,500,000,000 |  | 1,400,000,000 |
Granite Corporate Center - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,492,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 588,000 |  |  |  |  |
Buildings & Improvements | 7,808,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,368,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 727,000 |  |  |  |  |
Buildings & Improvements | 9,037,000 |  |  |  |  |
Accumulated Depreciation | (3,199,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,199,000 |  |  |  |  |
Unimproved Land [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 20,815,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,049,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 22,864,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 22,864,000 |  | 21,503,000 |  | 10,990,000 |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at beginning of year | 21,503,000 |  | 10,990,000 |  | 6,550,000 |
Additions during year [Abstract] |  |  |  |  |  |
Acquisitions | 3,022,000 |  | 13,329,000 |  | 4,600,000 |
Improvements and Other | 1,209,000 |  | 854,000 |  | 10,000 |
Deductions during year [Abstract] |  |  |  |  |  |
Transfers | (2,870,000) |  | (3,670,000) |  | (170,000) |
Balance at close of year | 22,864,000 |  | 21,503,000 |  | 10,990,000 |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Unimproved Land [Member] | Deer Ridge - Jamestown, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 711,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 711,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 711,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 711,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Unimproved Land [Member] | Minot Wells Fargo Bank - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 992,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 992,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 992,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 992,000 |  |  |  |  |
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 | 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 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2014 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,376,000 |  |  |  |  |
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 | 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 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [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 | 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 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Deductions during year [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 | 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 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Deductions during year [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 | 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 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [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 | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 314,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 562,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 876,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 876,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 876,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Unimproved Land [Member] | Eagan - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 423,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 423,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 423,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 423,000 |  |  |  |  |
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 | 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 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Deductions during year [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 | 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 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,278,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Unimproved Land [Member] | Kalispell - Kalispell, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,400,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 24,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,424,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 1,424,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,424,000 |  |  |  |  |
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 | 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 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2014 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 58,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Unimproved Land [Member] | Minot Southgate Lot 4 Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 890,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 890,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 890,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 890,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Unimproved Land [Member] | Monticello - Monticello, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 115,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 117,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 117,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 117,000 |  |  |  |  |
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 | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,229,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,348,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,577,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 3,577,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,577,000 |  |  |  |  |
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 | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 176,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 4,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 180,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 180,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 180,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Unimproved Land [Member] | Urbandale - Urbandale, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 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 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Deductions during year [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 | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 812,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 812,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 812,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 812,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Development in Progress [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 13,253,000 |  |  |  |  |
Buildings & Improvements | 64,949,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 26,407,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 13,253,000 |  |  |  |  |
Buildings & Improvements | 91,356,000 |  |  |  |  |
Total | 104,609,000 |  | 46,782,000 |  | 27,599,000 |
Accumulated Depreciation | 0 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at beginning of year | 46,782,000 |  | 27,599,000 |  | 9,693,000 |
Additions during year [Abstract] |  |  |  |  |  |
Acquisitions | 2,079,000 |  | 9,177,000 |  | 2,718,000 |
Improvements and Other | 123,240,000 |  | 52,970,000 |  | 40,358,000 |
Deductions during year [Abstract] |  |  |  |  |  |
Involuntary conversion | (7,052,000) |  | 0 |  | 0 |
Transfers | 2,870,000 |  | 0 |  | 0 |
Development placed in service | (63,210,000) | [3] | (42,964,000) | [3] | (23,434,000) | [3]
Other | (100,000) | [4] | 0 | [4] | (1,736,000) | [4]
Balance at close of year | 104,609,000 |  | 46,782,000 |  | 27,599,000 |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Development in Progress [Member] | Other [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,496,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 2,496,000 |  |  |  |  |
Total | 2,496,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,496,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Development in Progress [Member] | Renaissance Heights I - Williston ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,464,000 |  |  |  |  |
Buildings & Improvements | 23,900,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,165,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,464,000 |  |  |  |  |
Buildings & Improvements | 25,065,000 |  |  |  |  |
Total | 27,529,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 27,529,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Development in Progress [Member] | Arcata - Golden Valley, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,088,000 |  |  |  |  |
Buildings & Improvements | 8,974,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,956,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,088,000 |  |  |  |  |
Buildings & Improvements | 10,930,000 |  |  |  |  |
Total | 13,018,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 13,018,000 |  |  |  |  |
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 | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,600,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 5,229,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,600,000 |  |  |  |  |
Buildings & Improvements | 5,229,000 |  |  |  |  |
Total | 6,829,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,829,000 |  |  |  |  |
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 | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 240,000 |  |  |  |  |
Buildings & Improvements | 1,842,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 16,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 240,000 |  |  |  |  |
Buildings & Improvements | 1,858,000 |  |  |  |  |
Total | 2,098,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,098,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Development in Progress [Member] | Commons at Southgate - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,691,000 |  |  |  |  |
Buildings & Improvements | 22,819,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,555,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,691,000 |  |  |  |  |
Buildings & Improvements | 24,374,000 |  |  |  |  |
Total | 28,065,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 28,065,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Development in Progress [Member] | Cypress Court - Undev, St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 447,000 |  |  |  |  |
Buildings & Improvements | 5,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,128,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 447,000 |  |  |  |  |
Buildings & Improvements | 1,133,000 |  |  |  |  |
Total | 1,580,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,580,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Development in Progress [Member] | RED 20 - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 823,000 |  |  |  |  |
Buildings & Improvements | 7,293,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 898,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 823,000 |  |  |  |  |
Buildings & Improvements | 8,191,000 |  |  |  |  |
Total | 9,014,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,014,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Development in Progress [Member] | Dakota Commons - Williston, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,900,000 |  |  |  |  |
Buildings & Improvements | 116,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 11,964,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,900,000 |  |  |  |  |
Buildings & Improvements | 12,080,000 |  |  |  |  |
Total | 13,980,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 13,980,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Wholly Owned Properties [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Total | 1,996,031,000 | [3] | 2,032,970,000 | [3] | 1,892,009,000 | [3]
Accumulated Depreciation | (424,288,000) |  | (420,421,000) |  | (373,490,000) |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at beginning of year | 2,032,970,000 | [3] | 1,892,009,000 | [3] | 1,770,798,000 |
Additions during year [Abstract] |  |  |  |  |  |
Improvements and Other | 34,637,000 |  | 36,375,000 |  | 35,176,000 |
Total Additions | 2,169,729,000 |  | 2,060,505,000 |  | 1,903,131,000 |
Deductions during year [Abstract] |  |  |  |  |  |
Cost of real estate sold | (85,030,000) |  | (21,953,000) |  | (3,498,000) |
Impairment charge | (43,189,000) |  | (305,000) |  | (127,000) |
Write down of asset and accumulated depreciation on impaired assets | (31,688,000) |  | 0 |  | 0 |
Transfers | (10,307,000) |  | (1,893,000) |  | (1,288,000) |
Other | (3,484,000) | [5] | (3,384,000) | [5] | (6,209,000) | [5]
Balance at close of year | 1,996,031,000 | [3] | 2,032,970,000 | [3] | 1,892,009,000 | [3]
Reconciliations of accumulated depreciation/amortization [Abstract] |  |  |  |  |  |
Balance at beginning of year | 420,421,000 |  | 373,490,000 |  | 328,952,000 |
Additions during year [Abstract] |  |  |  |  |  |
Provisions for depreciation | 57,575,000 |  | 56,611,000 |  | 51,093,000 |
Deductions during year [Abstract] |  |  |  |  |  |
Accumulated depreciation on real estate sold | (19,413,000) |  | (6,444,000) |  | (758,000) |
Write down of asset and accumulated depreciation on impaired assets | (31,688,000) |  | 0 |  | 0 |
Other | (2,607,000) | [5] | (3,236,000) | [5] | (5,797,000) | [5]
Balance at close of year | 424,288,000 |  | 420,421,000 |  | 373,490,000 |
Multi-Family Residential [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 384,695,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 52,345,000 |  |  |  |  |
Buildings & Improvements | 578,841,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 122,545,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 66,722,000 |  |  |  |  |
Buildings & Improvements | 687,009,000 |  |  |  |  |
Total | 753,731,000 |  |  |  |  |
Accumulated Depreciation | (158,100,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 753,731,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 158,100,000 |  |  |  |  |
Multi-Family Residential [Member] | 11th Street 3 Plex - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 87,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 11,000 |  |  |  |  |
Buildings & Improvements | 53,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 17,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 19,000 |  |  |  |  |
Buildings & Improvements | 62,000 |  |  |  |  |
Total | 81,000 |  |  |  |  |
Accumulated Depreciation | (10,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 81,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 10,000 |  |  |  |  |
Multi-Family Residential [Member] | 4th Street 4 Plex - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 101,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 15,000 |  |  |  |  |
Buildings & Improvements | 74,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 27,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 23,000 |  |  |  |  |
Buildings & Improvements | 93,000 |  |  |  |  |
Total | 116,000 |  |  |  |  |
Accumulated Depreciation | (14,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 116,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 14,000 |  |  |  |  |
Multi-Family Residential [Member] | Alps Park - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,030,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 287,000 |  |  |  |  |
Buildings & Improvements | 5,551,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 84,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 289,000 |  |  |  |  |
Buildings & Improvements | 5,633,000 |  |  |  |  |
Total | 5,922,000 |  |  |  |  |
Accumulated Depreciation | (140,000) |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,922,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 140,000 |  |  |  |  |
Multi-Family Residential [Member] | Apartments on Main - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 666,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 158,000 |  |  |  |  |
Buildings & Improvements | 1,123,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 31,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 181,000 |  |  |  |  |
Buildings & Improvements | 1,131,000 |  |  |  |  |
Total | 1,312,000 |  |  |  |  |
Accumulated Depreciation | (198,000) |  |  |  |  |
Year of Construction or Acquisition | 1987 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,312,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 198,000 |  |  |  |  |
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 | 20 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 | 3,922,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 350,000 |  |  |  |  |
Buildings & Improvements | 6,625,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,610,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 790,000 |  |  |  |  |
Buildings & Improvements | 7,795,000 |  |  |  |  |
Total | 8,585,000 |  |  |  |  |
Accumulated Depreciation | (1,807,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,585,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,807,000 |  |  |  |  |
Multi-Family Residential [Member] | Ashland - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,615,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 741,000 |  |  |  |  |
Buildings & Improvements | 7,569,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 90,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 762,000 |  |  |  |  |
Buildings & Improvements | 7,638,000 |  |  |  |  |
Total | 8,400,000 |  |  |  |  |
Accumulated Depreciation | (460,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,400,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 460,000 |  |  |  |  |
Multi-Family Residential [Member] | Boulder Court - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,990,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,067,000 |  |  |  |  |
Buildings & Improvements | 5,498,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,853,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,299,000 |  |  |  |  |
Buildings & Improvements | 8,119,000 |  |  |  |  |
Total | 9,418,000 |  |  |  |  |
Accumulated Depreciation | (2,280,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,418,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,280,000 |  |  |  |  |
Multi-Family Residential [Member] | Brookfield Village - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,303,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 509,000 |  |  |  |  |
Buildings & Improvements | 6,698,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,393,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 674,000 |  |  |  |  |
Buildings & Improvements | 7,926,000 |  |  |  |  |
Total | 8,600,000 |  |  |  |  |
Accumulated Depreciation | (2,165,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,600,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,165,000 |  |  |  |  |
Multi-Family Residential [Member] | Brooklyn Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 749,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 145,000 |  |  |  |  |
Buildings & Improvements | 1,450,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 834,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 217,000 |  |  |  |  |
Buildings & Improvements | 2,212,000 |  |  |  |  |
Total | 2,429,000 |  |  |  |  |
Accumulated Depreciation | (875,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,429,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 875,000 |  |  |  |  |
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 | 1,206,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 395,000 |  |  |  |  |
Buildings & Improvements | 2,244,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 208,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 405,000 |  |  |  |  |
Buildings & Improvements | 2,442,000 |  |  |  |  |
Total | 2,847,000 |  |  |  |  |
Accumulated Depreciation | (459,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,847,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 459,000 |  |  |  |  |
Multi-Family Residential [Member] | Campus Heights - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 110,000 |  |  |  |  |
Buildings & Improvements | 628,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 93,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 124,000 |  |  |  |  |
Buildings & Improvements | 707,000 |  |  |  |  |
Total | 831,000 |  |  |  |  |
Accumulated Depreciation | (136,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 831,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 136,000 |  |  |  |  |
Multi-Family Residential [Member] | Campus Knoll - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 804,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 266,000 |  |  |  |  |
Buildings & Improvements | 1,512,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 120,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 279,000 |  |  |  |  |
Buildings & Improvements | 1,619,000 |  |  |  |  |
Total | 1,898,000 |  |  |  |  |
Accumulated Depreciation | (312,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,898,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 312,000 |  |  |  |  |
Multi-Family Residential [Member] | Campus Plaza - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 54,000 |  |  |  |  |
Buildings & Improvements | 311,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 69,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 60,000 |  |  |  |  |
Buildings & Improvements | 374,000 |  |  |  |  |
Total | 434,000 |  |  |  |  |
Accumulated Depreciation | (72,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 434,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 72,000 |  |  |  |  |
Multi-Family Residential [Member] | Campus Side - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 107,000 |  |  |  |  |
Buildings & Improvements | 615,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 140,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 118,000 |  |  |  |  |
Buildings & Improvements | 744,000 |  |  |  |  |
Total | 862,000 |  |  |  |  |
Accumulated Depreciation | (140,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 862,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 140,000 |  |  |  |  |
Multi-Family Residential [Member] | Campus View - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 107,000 |  |  |  |  |
Buildings & Improvements | 615,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 120,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 113,000 |  |  |  |  |
Buildings & Improvements | 729,000 |  |  |  |  |
Total | 842,000 |  |  |  |  |
Accumulated Depreciation | (136,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 842,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 136,000 |  |  |  |  |
Multi-Family Residential [Member] | Canyon Lake - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,894,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 305,000 |  |  |  |  |
Buildings & Improvements | 3,958,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,579,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 374,000 |  |  |  |  |
Buildings & Improvements | 5,468,000 |  |  |  |  |
Total | 5,842,000 |  |  |  |  |
Accumulated Depreciation | (1,548,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,842,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,548,000 |  |  |  |  |
Multi-Family Residential [Member] | Castlerock - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,677,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 736,000 |  |  |  |  |
Buildings & Improvements | 4,864,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,982,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 964,000 |  |  |  |  |
Buildings & Improvements | 6,618,000 |  |  |  |  |
Total | 7,582,000 |  |  |  |  |
Accumulated Depreciation | (2,504,000) |  |  |  |  |
Year of Construction or Acquisition | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,582,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,504,000 |  |  |  |  |
Multi-Family Residential [Member] | Chateau I - Minot ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 61,000 |  |  |  |  |
Buildings & Improvements | 5,663,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 561,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 67,000 |  |  |  |  |
Buildings & Improvements | 6,218,000 |  |  |  |  |
Total | 6,285,000 |  |  |  |  |
Accumulated Depreciation | (569,000) |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,285,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 569,000 |  |  |  |  |
Multi-Family Residential [Member] | Cimarron Hills - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,806,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 706,000 |  |  |  |  |
Buildings & Improvements | 9,588,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 4,198,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,302,000 |  |  |  |  |
Buildings & Improvements | 13,190,000 |  |  |  |  |
Total | 14,492,000 |  |  |  |  |
Accumulated Depreciation | (4,307,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 14,492,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,307,000 |  |  |  |  |
Multi-Family Residential [Member] | Colonial Villa - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,980,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,401,000 |  |  |  |  |
Buildings & Improvements | 11,515,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 6,416,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,827,000 |  |  |  |  |
Buildings & Improvements | 17,505,000 |  |  |  |  |
Total | 20,332,000 |  |  |  |  |
Accumulated Depreciation | (4,547,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 20,332,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,547,000 |  |  |  |  |
Multi-Family Residential [Member] | Colony - Lincoln, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,565,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,515,000 |  |  |  |  |
Buildings & Improvements | 15,730,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 389,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,544,000 |  |  |  |  |
Buildings & Improvements | 16,090,000 |  |  |  |  |
Total | 17,634,000 |  |  |  |  |
Accumulated Depreciation | (829,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 17,634,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 829,000 |  |  |  |  |
Multi-Family Residential [Member] | Colton Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 421,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 80,000 |  |  |  |  |
Buildings & Improvements | 672,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 414,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 116,000 |  |  |  |  |
Buildings & Improvements | 1,050,000 |  |  |  |  |
Total | 1,166,000 |  |  |  |  |
Accumulated Depreciation | (737,000) |  |  |  |  |
Year of Construction or Acquisition | 1984 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,166,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 737,000 |  |  |  |  |
Multi-Family Residential [Member] | Cornerstone - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 54,000 |  |  |  |  |
Buildings & Improvements | 311,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 71,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 57,000 |  |  |  |  |
Buildings & Improvements | 379,000 |  |  |  |  |
Total | 436,000 |  |  |  |  |
Accumulated Depreciation | (74,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 436,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 74,000 |  |  |  |  |
Multi-Family Residential [Member] | Cottage West Twin Homes - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,646,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 968,000 |  |  |  |  |
Buildings & Improvements | 3,762,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 373,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,005,000 |  |  |  |  |
Buildings & Improvements | 4,098,000 |  |  |  |  |
Total | 5,103,000 |  |  |  |  |
Accumulated Depreciation | (265,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,103,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 265,000 |  |  |  |  |
Multi-Family Residential [Member] | Cottonwood - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 15,803,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,056,000 |  |  |  |  |
Buildings & Improvements | 17,372,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,146,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,354,000 |  |  |  |  |
Buildings & Improvements | 20,220,000 |  |  |  |  |
Total | 21,574,000 |  |  |  |  |
Accumulated Depreciation | (6,372,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 21,574,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,372,000 |  |  |  |  |
Multi-Family Residential [Member] | Country Meadows - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,678,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 491,000 |  |  |  |  |
Buildings & Improvements | 7,809,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,344,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 535,000 |  |  |  |  |
Buildings & Improvements | 9,109,000 |  |  |  |  |
Total | 9,644,000 |  |  |  |  |
Accumulated Depreciation | (3,507,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,644,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,507,000 |  |  |  |  |
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 | 3,917,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 235,000 |  |  |  |  |
Buildings & Improvements | 4,290,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,576,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 495,000 |  |  |  |  |
Buildings & Improvements | 5,606,000 |  |  |  |  |
Total | 6,101,000 |  |  |  |  |
Accumulated Depreciation | (2,740,000) |  |  |  |  |
Year of Construction or Acquisition | 1994 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,101,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,740,000 |  |  |  |  |
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 | 2,629,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 261,000 |  |  |  |  |
Buildings & Improvements | 3,289,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 194,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 266,000 |  |  |  |  |
Buildings & Improvements | 3,478,000 |  |  |  |  |
Total | 3,744,000 |  |  |  |  |
Accumulated Depreciation | (368,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,744,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 368,000 |  |  |  |  |
Multi-Family Residential [Member] | Crown Colony - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,220,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 620,000 |  |  |  |  |
Buildings & Improvements | 9,956,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,220,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 857,000 |  |  |  |  |
Buildings & Improvements | 11,939,000 |  |  |  |  |
Total | 12,796,000 |  |  |  |  |
Accumulated Depreciation | (4,215,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,796,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,215,000 |  |  |  |  |
Multi-Family Residential [Member] | Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,136,000 |  |  |  |  |
Buildings & Improvements | 12,428,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 102,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,136,000 |  |  |  |  |
Buildings & Improvements | 12,530,000 |  |  |  |  |
Total | 13,666,000 |  |  |  |  |
Accumulated Depreciation | (196,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 13,666,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 196,000 |  |  |  |  |
Multi-Family Residential [Member] | Evergreen - Isanti, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,019,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 380,000 |  |  |  |  |
Buildings & Improvements | 2,740,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 84,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 380,000 |  |  |  |  |
Buildings & Improvements | 2,824,000 |  |  |  |  |
Total | 3,204,000 |  |  |  |  |
Accumulated Depreciation | (398,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,204,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 398,000 |  |  |  |  |
Multi-Family Residential [Member] | Evergreen II - Isanti, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,108,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 691,000 |  |  |  |  |
Buildings & Improvements | 2,784,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 23,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 691,000 |  |  |  |  |
Buildings & Improvements | 2,807,000 |  |  |  |  |
Total | 3,498,000 |  |  |  |  |
Accumulated Depreciation | (196,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,498,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 196,000 |  |  |  |  |
Multi-Family Residential [Member] | Fairmont - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 344,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 28,000 |  |  |  |  |
Buildings & Improvements | 337,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 70,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 55,000 |  |  |  |  |
Buildings & Improvements | 380,000 |  |  |  |  |
Total | 435,000 |  |  |  |  |
Accumulated Depreciation | (61,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 435,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 61,000 |  |  |  |  |
Multi-Family Residential [Member] | First Avenue - Minot ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 3,046,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 5,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 3,051,000 |  |  |  |  |
Total | 3,051,000 |  |  |  |  |
Accumulated Depreciation | (78,000) |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,051,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 78,000 |  |  |  |  |
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,692,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 810,000 |  |  |  |  |
Buildings & Improvements | 5,579,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 7,031,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,409,000 |  |  |  |  |
Buildings & Improvements | 12,011,000 |  |  |  |  |
Total | 13,420,000 |  |  |  |  |
Accumulated Depreciation | (4,893,000) |  |  |  |  |
Year of Construction or Acquisition | 1993 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 13,420,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,893,000 |  |  |  |  |
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 | 20 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 | 1,476,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 349,000 |  |  |  |  |
Buildings & Improvements | 1,921,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 160,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 371,000 |  |  |  |  |
Buildings & Improvements | 2,059,000 |  |  |  |  |
Total | 2,430,000 |  |  |  |  |
Accumulated Depreciation | (133,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,430,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 133,000 |  |  |  |  |
Multi-Family Residential [Member] | Grand Gateway - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,465,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 814,000 |  |  |  |  |
Buildings & Improvements | 7,086,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 580,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 912,000 |  |  |  |  |
Buildings & Improvements | 7,568,000 |  |  |  |  |
Total | 8,480,000 |  |  |  |  |
Accumulated Depreciation | (490,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,480,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 490,000 |  |  |  |  |
Multi-Family Residential [Member] | Greenfield - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,598,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 578,000 |  |  |  |  |
Buildings & Improvements | 4,122,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 663,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 778,000 |  |  |  |  |
Buildings & Improvements | 4,585,000 |  |  |  |  |
Total | 5,363,000 |  |  |  |  |
Accumulated Depreciation | (783,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,363,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 783,000 |  |  |  |  |
Multi-Family Residential [Member] | Heritage Manor - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,051,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 403,000 |  |  |  |  |
Buildings & Improvements | 6,968,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,632,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 578,000 |  |  |  |  |
Buildings & Improvements | 9,425,000 |  |  |  |  |
Total | 10,003,000 |  |  |  |  |
Accumulated Depreciation | (3,489,000) |  |  |  |  |
Year of Construction or Acquisition | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 10,003,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,489,000 |  |  |  |  |
Multi-Family Residential [Member] | Indian Hills - Sioux City, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 294,000 |  |  |  |  |
Buildings & Improvements | 2,921,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,403,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 386,000 |  |  |  |  |
Buildings & Improvements | 6,232,000 |  |  |  |  |
Total | 6,618,000 |  |  |  |  |
Accumulated Depreciation | (1,144,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,618,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,144,000 |  |  |  |  |
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,312,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 449,000 |  |  |  |  |
Buildings & Improvements | 2,725,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,579,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 546,000 |  |  |  |  |
Buildings & Improvements | 4,207,000 |  |  |  |  |
Total | 4,753,000 |  |  |  |  |
Accumulated Depreciation | (1,655,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,753,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,655,000 |  |  |  |  |
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 | 13,382,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,215,000 |  |  |  |  |
Buildings & Improvements | 15,837,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 262,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,235,000 |  |  |  |  |
Buildings & Improvements | 16,079,000 |  |  |  |  |
Total | 17,314,000 |  |  |  |  |
Accumulated Depreciation | (821,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 17,314,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 821,000 |  |  |  |  |
Multi-Family Residential [Member] | Lancaster - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 289,000 |  |  |  |  |
Buildings & Improvements | 2,899,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,079,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 460,000 |  |  |  |  |
Buildings & Improvements | 3,807,000 |  |  |  |  |
Total | 4,267,000 |  |  |  |  |
Accumulated Depreciation | (1,410,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,267,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,410,000 |  |  |  |  |
Multi-Family Residential [Member] | Landing at Southgate - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,254,000 |  |  |  |  |
Buildings & Improvements | 12,872,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 25,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,254,000 |  |  |  |  |
Buildings & Improvements | 12,897,000 |  |  |  |  |
Total | 15,151,000 |  |  |  |  |
Accumulated Depreciation | (212,000) |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 15,151,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 212,000 |  |  |  |  |
Multi-Family Residential [Member] | Landmark - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,638,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 184,000 |  |  |  |  |
Buildings & Improvements | 1,514,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,023,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 313,000 |  |  |  |  |
Buildings & Improvements | 2,408,000 |  |  |  |  |
Total | 2,721,000 |  |  |  |  |
Accumulated Depreciation | (983,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,721,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 983,000 |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 15,885,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,362,000 |  |  |  |  |
Buildings & Improvements | 21,727,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 6,289,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,088,000 |  |  |  |  |
Buildings & Improvements | 27,290,000 |  |  |  |  |
Total | 29,378,000 |  |  |  |  |
Accumulated Depreciation | (9,395,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 29,378,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,395,000 |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Year 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] |  |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Mariposa - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,975,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 399,000 |  |  |  |  |
Buildings & Improvements | 5,110,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 487,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 426,000 |  |  |  |  |
Buildings & Improvements | 5,570,000 |  |  |  |  |
Total | 5,996,000 |  |  |  |  |
Accumulated Depreciation | (1,341,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,996,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,341,000 |  |  |  |  |
Multi-Family Residential [Member] | Meadows - Jamestown, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 590,000 |  |  |  |  |
Buildings & Improvements | 4,519,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,256,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 653,000 |  |  |  |  |
Buildings & Improvements | 5,712,000 |  |  |  |  |
Total | 6,365,000 |  |  |  |  |
Accumulated Depreciation | (1,968,000) |  |  |  |  |
Year of Construction or Acquisition | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,365,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,968,000 |  |  |  |  |
Multi-Family Residential [Member] | Monticello Village - Monticello, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 490,000 |  |  |  |  |
Buildings & Improvements | 3,756,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 447,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 621,000 |  |  |  |  |
Buildings & Improvements | 4,072,000 |  |  |  |  |
Total | 4,693,000 |  |  |  |  |
Accumulated Depreciation | (1,136,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,693,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,136,000 |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,431,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 303,000 |  |  |  |  |
Buildings & Improvements | 3,957,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 532,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 339,000 |  |  |  |  |
Buildings & Improvements | 4,453,000 |  |  |  |  |
Total | 4,792,000 |  |  |  |  |
Accumulated Depreciation | (1,338,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,792,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,338,000 |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Year 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] |  |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Northern Valley - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 110,000 |  |  |  |  |
Buildings & Improvements | 610,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 108,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 119,000 |  |  |  |  |
Buildings & Improvements | 709,000 |  |  |  |  |
Total | 828,000 |  |  |  |  |
Accumulated Depreciation | (77,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 828,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 77,000 |  |  |  |  |
Multi-Family Residential [Member] | Oakmont Estates - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,473,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 423,000 |  |  |  |  |
Buildings & Improvements | 4,838,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 517,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 558,000 |  |  |  |  |
Buildings & Improvements | 5,220,000 |  |  |  |  |
Total | 5,778,000 |  |  |  |  |
Accumulated Depreciation | (1,602,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,778,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,602,000 |  |  |  |  |
Multi-Family Residential [Member] | Oakwood Estates - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,025,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 543,000 |  |  |  |  |
Buildings & Improvements | 2,784,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 4,265,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 775,000 |  |  |  |  |
Buildings & Improvements | 6,817,000 |  |  |  |  |
Total | 7,592,000 |  |  |  |  |
Accumulated Depreciation | (3,015,000) |  |  |  |  |
Year of Construction or Acquisition | 1993 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,592,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,015,000 |  |  |  |  |
Multi-Family Residential [Member] | Olympic Village - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 10,770,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,164,000 |  |  |  |  |
Buildings & Improvements | 10,441,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,861,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,757,000 |  |  |  |  |
Buildings & Improvements | 12,709,000 |  |  |  |  |
Total | 14,466,000 |  |  |  |  |
Accumulated Depreciation | (4,461,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 14,466,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,461,000 |  |  |  |  |
Multi-Family Residential [Member] | Olympik Village - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,499,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,034,000 |  |  |  |  |
Buildings & Improvements | 6,109,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,711,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,168,000 |  |  |  |  |
Buildings & Improvements | 7,686,000 |  |  |  |  |
Total | 8,854,000 |  |  |  |  |
Accumulated Depreciation | (1,870,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,854,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,870,000 |  |  |  |  |
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,931,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 404,000 |  |  |  |  |
Buildings & Improvements | 3,152,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,658,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 665,000 |  |  |  |  |
Buildings & Improvements | 5,549,000 |  |  |  |  |
Total | 6,214,000 |  |  |  |  |
Accumulated Depreciation | (2,625,000) |  |  |  |  |
Year of Construction or Acquisition | 1994 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,214,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,625,000 |  |  |  |  |
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 | 8,616,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,143,000 |  |  |  |  |
Buildings & Improvements | 9,099,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 5,423,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,595,000 |  |  |  |  |
Buildings & Improvements | 14,070,000 |  |  |  |  |
Total | 15,665,000 |  |  |  |  |
Accumulated Depreciation | (5,790,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 15,665,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,790,000 |  |  |  |  |
Multi-Family Residential [Member] | Pebble Springs - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 775,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 7,000 |  |  |  |  |
Buildings & Improvements | 748,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 149,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 44,000 |  |  |  |  |
Buildings & Improvements | 860,000 |  |  |  |  |
Total | 904,000 |  |  |  |  |
Accumulated Depreciation | (323,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 904,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 323,000 |  |  |  |  |
Multi-Family Residential [Member] | Pinehurst - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 243,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 72,000 |  |  |  |  |
Buildings & Improvements | 687,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 239,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 79,000 |  |  |  |  |
Buildings & Improvements | 919,000 |  |  |  |  |
Total | 998,000 |  |  |  |  |
Accumulated Depreciation | (276,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 998,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 276,000 |  |  |  |  |
Multi-Family Residential [Member] | Pinecone Villas - Sartell, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 584,000 |  |  |  |  |
Buildings & Improvements | 2,191,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 8,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 584,000 |  |  |  |  |
Buildings & Improvements | 2,199,000 |  |  |  |  |
Total | 2,783,000 |  |  |  |  |
Accumulated Depreciation | (33,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,783,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 33,000 |  |  |  |  |
Multi-Family Residential [Member] | Pines - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 120,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 35,000 |  |  |  |  |
Buildings & Improvements | 215,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 184,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 49,000 |  |  |  |  |
Buildings & Improvements | 385,000 |  |  |  |  |
Total | 434,000 |  |  |  |  |
Accumulated Depreciation | (132,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 434,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 132,000 |  |  |  |  |
Multi-Family Residential [Member] | Plaza - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,478,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 867,000 |  |  |  |  |
Buildings & Improvements | 12,784,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,335,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 992,000 |  |  |  |  |
Buildings & Improvements | 14,994,000 |  |  |  |  |
Total | 15,986,000 |  |  |  |  |
Accumulated Depreciation | (2,029,000) |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 15,986,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,029,000 |  |  |  |  |
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,679,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 240,000 |  |  |  |  |
Buildings & Improvements | 3,538,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,485,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 364,000 |  |  |  |  |
Buildings & Improvements | 4,899,000 |  |  |  |  |
Total | 5,263,000 |  |  |  |  |
Accumulated Depreciation | (2,240,000) |  |  |  |  |
Year of Construction or Acquisition | 1994 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,263,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,240,000 |  |  |  |  |
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 | 3,950,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 395,000 |  |  |  |  |
Buildings & Improvements | 4,564,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 232,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 395,000 |  |  |  |  |
Buildings & Improvements | 4,796,000 |  |  |  |  |
Total | 5,191,000 |  |  |  |  |
Accumulated Depreciation | (216,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,191,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 216,000 |  |  |  |  |
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,438,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 144,000 |  |  |  |  |
Buildings & Improvements | 1,816,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 466,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 229,000 |  |  |  |  |
Buildings & Improvements | 2,197,000 |  |  |  |  |
Total | 2,426,000 |  |  |  |  |
Accumulated Depreciation | (1,171,000) |  |  |  |  |
Year of Construction or Acquisition | 1993 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,426,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,171,000 |  |  |  |  |
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 | 13,603,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,312,000 |  |  |  |  |
Buildings & Improvements | 13,362,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,129,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,353,000 |  |  |  |  |
Buildings & Improvements | 14,450,000 |  |  |  |  |
Total | 15,803,000 |  |  |  |  |
Accumulated Depreciation | (2,811,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 15,803,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,811,000 |  |  |  |  |
Multi-Family Residential [Member] | Quarry Ridge 2 - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 14,158,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 942,000 |  |  |  |  |
Buildings & Improvements | 16,661,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 39,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 945,000 |  |  |  |  |
Buildings & Improvements | 16,697,000 |  |  |  |  |
Total | 17,642,000 |  |  |  |  |
Accumulated Depreciation | (830,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 17,642,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 830,000 |  |  |  |  |
Multi-Family Residential [Member] | Regency Park Estates - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,827,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 702,000 |  |  |  |  |
Buildings & Improvements | 10,198,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,244,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 751,000 |  |  |  |  |
Buildings & Improvements | 11,393,000 |  |  |  |  |
Total | 12,144,000 |  |  |  |  |
Accumulated Depreciation | (804,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,144,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 804,000 |  |  |  |  |
Multi-Family Residential [Member] | Renaissance Heights I - Williston ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 616,000 |  |  |  |  |
Buildings & Improvements | 10,872,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 25,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 616,000 |  |  |  |  |
Buildings & Improvements | 10,897,000 |  |  |  |  |
Total | 11,513,000 |  |  |  |  |
Accumulated Depreciation | (58,000) |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 11,513,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 58,000 |  |  |  |  |
Multi-Family Residential [Member] | Ridge Oaks - Sioux City, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,414,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 178,000 |  |  |  |  |
Buildings & Improvements | 4,073,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,087,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 281,000 |  |  |  |  |
Buildings & Improvements | 6,057,000 |  |  |  |  |
Total | 6,338,000 |  |  |  |  |
Accumulated Depreciation | (2,042,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,338,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,042,000 |  |  |  |  |
Multi-Family Residential [Member] | Rimrock West - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,339,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 330,000 |  |  |  |  |
Buildings & Improvements | 3,489,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,453,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 431,000 |  |  |  |  |
Buildings & Improvements | 4,841,000 |  |  |  |  |
Total | 5,272,000 |  |  |  |  |
Accumulated Depreciation | (1,624,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,272,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,624,000 |  |  |  |  |
Multi-Family Residential [Member] | River Ridge - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 576,000 |  |  |  |  |
Buildings & Improvements | 23,434,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,076,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,423,000 |  |  |  |  |
Buildings & Improvements | 23,663,000 |  |  |  |  |
Total | 25,086,000 |  |  |  |  |
Accumulated Depreciation | (438,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 25,086,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 438,000 |  |  |  |  |
Multi-Family Residential [Member] | Rocky Meadows - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,177,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 656,000 |  |  |  |  |
Buildings & Improvements | 5,726,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,085,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 769,000 |  |  |  |  |
Buildings & Improvements | 6,698,000 |  |  |  |  |
Total | 7,467,000 |  |  |  |  |
Accumulated Depreciation | (2,942,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,467,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,942,000 |  |  |  |  |
Multi-Family Residential [Member] | Rum River - Isanti, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,609,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 843,000 |  |  |  |  |
Buildings & Improvements | 4,823,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 146,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 848,000 |  |  |  |  |
Buildings & Improvements | 4,964,000 |  |  |  |  |
Total | 5,812,000 |  |  |  |  |
Accumulated Depreciation | (882,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,812,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 882,000 |  |  |  |  |
Multi-Family Residential [Member] | Sherwood - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 12,340,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,142,000 |  |  |  |  |
Buildings & Improvements | 14,684,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,870,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,636,000 |  |  |  |  |
Buildings & Improvements | 17,060,000 |  |  |  |  |
Total | 18,696,000 |  |  |  |  |
Accumulated Depreciation | (6,150,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 18,696,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,150,000 |  |  |  |  |
Multi-Family Residential [Member] | Sierra Vista - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,421,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 241,000 |  |  |  |  |
Buildings & Improvements | 2,097,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 385,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 265,000 |  |  |  |  |
Buildings & Improvements | 2,458,000 |  |  |  |  |
Total | 2,723,000 |  |  |  |  |
Accumulated Depreciation | (198,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,723,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 198,000 |  |  |  |  |
Multi-Family Residential [Member] | Southpoint - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 576,000 |  |  |  |  |
Buildings & Improvements | 9,893,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 16,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 576,000 |  |  |  |  |
Buildings & Improvements | 9,909,000 |  |  |  |  |
Total | 10,485,000 |  |  |  |  |
Accumulated Depreciation | (158,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 10,485,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 158,000 |  |  |  |  |
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,789,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 550,000 |  |  |  |  |
Buildings & Improvements | 9,548,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,603,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,316,000 |  |  |  |  |
Buildings & Improvements | 11,385,000 |  |  |  |  |
Total | 12,701,000 |  |  |  |  |
Accumulated Depreciation | (5,165,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,701,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,165,000 |  |  |  |  |
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] | Southview - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,059,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 185,000 |  |  |  |  |
Buildings & Improvements | 469,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 355,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 237,000 |  |  |  |  |
Buildings & Improvements | 772,000 |  |  |  |  |
Total | 1,009,000 |  |  |  |  |
Accumulated Depreciation | (344,000) |  |  |  |  |
Year of Construction or Acquisition | 1994 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,009,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 344,000 |  |  |  |  |
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,615,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 400,000 |  |  |  |  |
Buildings & Improvements | 5,034,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,714,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 726,000 |  |  |  |  |
Buildings & Improvements | 7,422,000 |  |  |  |  |
Total | 8,148,000 |  |  |  |  |
Accumulated Depreciation | (3,216,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,148,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,216,000 |  |  |  |  |
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 | 1,039,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 161,000 |  |  |  |  |
Buildings & Improvements | 1,898,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,338,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 419,000 |  |  |  |  |
Buildings & Improvements | 2,978,000 |  |  |  |  |
Total | 3,397,000 |  |  |  |  |
Accumulated Depreciation | (1,167,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,397,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,167,000 |  |  |  |  |
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 | 8,138,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 336,000 |  |  |  |  |
Buildings & Improvements | 12,814,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,490,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 543,000 |  |  |  |  |
Buildings & Improvements | 15,097,000 |  |  |  |  |
Total | 15,640,000 |  |  |  |  |
Accumulated Depreciation | (5,011,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 15,640,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,011,000 |  |  |  |  |
Multi-Family Residential [Member] | Temple - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 78,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 229,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 229,000 |  |  |  |  |
Total | 229,000 |  |  |  |  |
Accumulated Depreciation | (50,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 229,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 50,000 |  |  |  |  |
Multi-Family Residential [Member] | Terrace Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 173,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 29,000 |  |  |  |  |
Buildings & Improvements | 312,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 88,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 40,000 |  |  |  |  |
Buildings & Improvements | 389,000 |  |  |  |  |
Total | 429,000 |  |  |  |  |
Accumulated Depreciation | (164,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 429,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 164,000 |  |  |  |  |
Multi-Family Residential [Member] | Thomasbrook - Lincoln, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,987,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 600,000 |  |  |  |  |
Buildings & Improvements | 10,306,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,189,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,242,000 |  |  |  |  |
Buildings & Improvements | 12,853,000 |  |  |  |  |
Total | 14,095,000 |  |  |  |  |
Accumulated Depreciation | (4,366,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 14,095,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,366,000 |  |  |  |  |
Multi-Family Residential [Member] | University Park Place - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 78,000 |  |  |  |  |
Buildings & Improvements | 450,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 100,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 82,000 |  |  |  |  |
Buildings & Improvements | 546,000 |  |  |  |  |
Total | 628,000 |  |  |  |  |
Accumulated Depreciation | (99,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 628,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 99,000 |  |  |  |  |
Multi-Family Residential [Member] | Valley Park - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,886,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 294,000 |  |  |  |  |
Buildings & Improvements | 4,137,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,304,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,095,000 |  |  |  |  |
Buildings & Improvements | 6,640,000 |  |  |  |  |
Total | 7,735,000 |  |  |  |  |
Accumulated Depreciation | (2,375,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,735,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,375,000 |  |  |  |  |
Multi-Family Residential [Member] | Villa West - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 12,280,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,590,000 |  |  |  |  |
Buildings & Improvements | 15,760,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 513,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,674,000 |  |  |  |  |
Buildings & Improvements | 16,189,000 |  |  |  |  |
Total | 17,863,000 |  |  |  |  |
Accumulated Depreciation | (845,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 17,863,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 845,000 |  |  |  |  |
Multi-Family Residential [Member] | Village Green - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,145,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 234,000 |  |  |  |  |
Buildings & Improvements | 2,296,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 800,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 359,000 |  |  |  |  |
Buildings & Improvements | 2,971,000 |  |  |  |  |
Total | 3,330,000 |  |  |  |  |
Accumulated Depreciation | (828,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,330,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 828,000 |  |  |  |  |
Multi-Family Residential [Member] | West Stonehill - Waite Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,621,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 939,000 |  |  |  |  |
Buildings & Improvements | 10,167,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 4,817,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,473,000 |  |  |  |  |
Buildings & Improvements | 14,450,000 |  |  |  |  |
Total | 15,923,000 |  |  |  |  |
Accumulated Depreciation | (6,513,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 15,923,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,513,000 |  |  |  |  |
Multi-Family Residential [Member] | Westridge - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,662,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 68,000 |  |  |  |  |
Buildings & Improvements | 1,887,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 165,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 75,000 |  |  |  |  |
Buildings & Improvements | 2,045,000 |  |  |  |  |
Total | 2,120,000 |  |  |  |  |
Accumulated Depreciation | (309,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,120,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 309,000 |  |  |  |  |
Multi-Family Residential [Member] | Westwood Park - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,982,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 116,000 |  |  |  |  |
Buildings & Improvements | 1,909,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,706,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 268,000 |  |  |  |  |
Buildings & Improvements | 3,463,000 |  |  |  |  |
Total | 3,731,000 |  |  |  |  |
Accumulated Depreciation | (1,315,000) |  |  |  |  |
Year of Construction or Acquisition | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,731,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,315,000 |  |  |  |  |
Multi-Family Residential [Member] | Whispering Ridge - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 22,000,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,139,000 |  |  |  |  |
Buildings & Improvements | 25,424,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 396,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,243,000 |  |  |  |  |
Buildings & Improvements | 25,716,000 |  |  |  |  |
Total | 27,959,000 |  |  |  |  |
Accumulated Depreciation | (806,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 27,959,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 806,000 |  |  |  |  |
Multi-Family Residential [Member] | Williston Garden - Williston, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 12,057,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,400,000 |  |  |  |  |
Buildings & Improvements | 17,699,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 33,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,408,000 |  |  |  |  |
Buildings & Improvements | 17,724,000 |  |  |  |  |
Total | 19,132,000 |  |  |  |  |
Accumulated Depreciation | (1,416,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 19,132,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,416,000 |  |  |  |  |
Multi-Family Residential [Member] | Winchester - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,802,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 748,000 |  |  |  |  |
Buildings & Improvements | 5,622,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,700,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,006,000 |  |  |  |  |
Buildings & Improvements | 7,064,000 |  |  |  |  |
Total | 8,070,000 |  |  |  |  |
Accumulated Depreciation | (2,071,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,070,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,071,000 |  |  |  |  |
Multi-Family Residential [Member] | Woodridge - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,412,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 370,000 |  |  |  |  |
Buildings & Improvements | 6,028,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,925,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 502,000 |  |  |  |  |
Buildings & Improvements | 7,821,000 |  |  |  |  |
Total | 8,323,000 |  |  |  |  |
Accumulated Depreciation | (3,337,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,323,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,337,000 |  |  |  |  |
Multi-Family Residential [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Additions | 84,117,000 |  | 113,859,000 |  | 47,433,000 |
Commercial-Office [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 328,879,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 70,098,000 |  |  |  |  |
Buildings & Improvements | 407,590,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 66,940,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 72,277,000 |  |  |  |  |
Buildings & Improvements | 472,351,000 |  |  |  |  |
Total | 544,628,000 |  |  |  |  |
Accumulated Depreciation | (121,892,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 544,628,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 121,892,000 |  |  |  |  |
Commercial-Office [Member] | Eden Prairie 6101 Blue Circle Drive - Eden Prairie, MN [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 |  |  |  |  |
Accumulated Depreciation | (1,596,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,864,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,596,000 |  |  |  |  |
Commercial-Office [Member] | Granite Corporate Center - St. Cloud, MN [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Total | 9,764,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,764,000 |  |  |  |  |
Commercial-Office [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 | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 337,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 30,000 |  |  |  |  |
Buildings & Improvements | 337,000 |  |  |  |  |
Total | 367,000 |  |  |  |  |
Accumulated Depreciation | (33,000) |  |  |  |  |
Year of Construction or Acquisition | 1981 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 367,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 33,000 |  |  |  |  |
Commercial-Office [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 |  |  |  |  |
Commercial-Office [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 |  |  |  |  |
Commercial-Office [Member] | 2030 Cliff Road - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 938,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 146,000 |  |  |  |  |
Buildings & Improvements | 835,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 90,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 158,000 |  |  |  |  |
Buildings & Improvements | 913,000 |  |  |  |  |
Total | 1,071,000 |  |  |  |  |
Accumulated Depreciation | (300,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,071,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 300,000 |  |  |  |  |
Commercial-Office [Member] | 610 Business Center IV - Brooklyn Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,888,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (2,060,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,403,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,060,000 |  |  |  |  |
Commercial-Office [Member] | 7800 West Brown Deer Road - Milwaukee, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 10,520,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,455,000 |  |  |  |  |
Buildings & Improvements | 8,756,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,333,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,475,000 |  |  |  |  |
Buildings & Improvements | 11,069,000 |  |  |  |  |
Total | 12,544,000 |  |  |  |  |
Accumulated Depreciation | (3,621,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,544,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,621,000 |  |  |  |  |
Commercial-Office [Member] | American Corporate Center - Mendota Heights, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,794,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 893,000 |  |  |  |  |
Buildings & Improvements | 16,768,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 4,062,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 893,000 |  |  |  |  |
Buildings & Improvements | 20,830,000 |  |  |  |  |
Total | 21,723,000 |  |  |  |  |
Accumulated Depreciation | (8,339,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 21,723,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,339,000 |  |  |  |  |
Commercial-Office [Member] | Ameritrade - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,440,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (3,014,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,349,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,014,000 |  |  |  |  |
Commercial-Office [Member] | Benton Business Park - Sauk Rapids, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 491,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 188,000 |  |  |  |  |
Buildings & Improvements | 1,261,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 89,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 188,000 |  |  |  |  |
Buildings & Improvements | 1,350,000 |  |  |  |  |
Total | 1,538,000 |  |  |  |  |
Accumulated Depreciation | (394,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,538,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 394,000 |  |  |  |  |
Commercial-Office [Member] | Bismarck 715 East Broadway - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,163,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (373,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,798,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 373,000 |  |  |  |  |
Commercial-Office [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 | 3,203,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,650,000 |  |  |  |  |
Buildings & Improvements | 15,333,000 |  |  |  |  |
Total | 16,983,000 |  |  |  |  |
Accumulated Depreciation | (5,379,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 16,983,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,379,000 |  |  |  |  |
Commercial-Office [Member] | Brook Valley I - La Vista, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,256,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 347,000 |  |  |  |  |
Buildings & Improvements | 1,671,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 129,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 347,000 |  |  |  |  |
Buildings & Improvements | 1,800,000 |  |  |  |  |
Total | 2,147,000 |  |  |  |  |
Accumulated Depreciation | (407,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,147,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 407,000 |  |  |  |  |
Commercial-Office [Member] | Burnsville Bluffs II - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,679,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 300,000 |  |  |  |  |
Buildings & Improvements | 2,154,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 986,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 374,000 |  |  |  |  |
Buildings & Improvements | 3,066,000 |  |  |  |  |
Total | 3,440,000 |  |  |  |  |
Accumulated Depreciation | (1,324,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,440,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,324,000 |  |  |  |  |
Commercial-Office [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 | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,880,000 |  |  |  |  |
Buildings & Improvements | 5,253,000 |  |  |  |  |
Total | 9,133,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,133,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Commercial-Office [Member] | Crosstown Centre - Eden Prairie, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 12,707,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,884,000 |  |  |  |  |
Buildings & Improvements | 14,569,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,563,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,932,000 |  |  |  |  |
Buildings & Improvements | 17,084,000 |  |  |  |  |
Total | 20,016,000 |  |  |  |  |
Accumulated Depreciation | (4,328,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 20,016,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,328,000 |  |  |  |  |
Commercial-Office [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 | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,188,000 |  |  |  |  |
Buildings & Improvements | 7,912,000 |  |  |  |  |
Total | 10,100,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 10,100,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Commercial-Office [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 | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,899,000 |  |  |  |  |
Buildings & Improvements | 15,518,000 |  |  |  |  |
Total | 17,417,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 17,417,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Commercial-Office [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 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,300,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Commercial-Office [Member] | Golden Hills Office Center - Golden Valley, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 17,711,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,018,000 |  |  |  |  |
Buildings & Improvements | 18,544,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,852,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,018,000 |  |  |  |  |
Buildings & Improvements | 22,396,000 |  |  |  |  |
Total | 25,414,000 |  |  |  |  |
Accumulated Depreciation | (8,049,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 25,414,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,049,000 |  |  |  |  |
Commercial-Office [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 | 719,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 126,000 |  |  |  |  |
Buildings & Improvements | 15,959,000 |  |  |  |  |
Total | 16,085,000 |  |  |  |  |
Accumulated Depreciation | (5,640,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 16,085,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,640,000 |  |  |  |  |
Commercial-Office [Member] | Highlands Ranch I - Highlands Ranch, CO [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,992,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,268,000 |  |  |  |  |
Buildings & Improvements | 8,362,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 427,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,268,000 |  |  |  |  |
Buildings & Improvements | 8,789,000 |  |  |  |  |
Total | 11,057,000 |  |  |  |  |
Accumulated Depreciation | (1,829,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 11,057,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,829,000 |  |  |  |  |
Commercial-Office [Member] | Highlands Ranch II - Highlands Ranch, CO [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,601,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,437,000 |  |  |  |  |
Buildings & Improvements | 9,549,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,693,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,437,000 |  |  |  |  |
Buildings & Improvements | 11,242,000 |  |  |  |  |
Total | 12,679,000 |  |  |  |  |
Accumulated Depreciation | (3,011,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,679,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,011,000 |  |  |  |  |
Commercial-Office [Member] | Interlachen Corporate Center - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,619,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,650,000 |  |  |  |  |
Buildings & Improvements | 14,983,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,459,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,668,000 |  |  |  |  |
Buildings & Improvements | 17,424,000 |  |  |  |  |
Total | 19,092,000 |  |  |  |  |
Accumulated Depreciation | (5,684,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 19,092,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,684,000 |  |  |  |  |
Commercial-Office [Member] | Intertech Building - Fenton, MO [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,301,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,130,000 |  |  |  |  |
Buildings & Improvements | 3,968,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,268,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,191,000 |  |  |  |  |
Buildings & Improvements | 5,175,000 |  |  |  |  |
Total | 7,366,000 |  |  |  |  |
Accumulated Depreciation | (970,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,366,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 970,000 |  |  |  |  |
Commercial-Office [Member] | Mendota Office Center I - Mendota Heights, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,787,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 835,000 |  |  |  |  |
Buildings & Improvements | 6,169,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 889,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 835,000 |  |  |  |  |
Buildings & Improvements | 7,058,000 |  |  |  |  |
Total | 7,893,000 |  |  |  |  |
Accumulated Depreciation | (2,420,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,893,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,420,000 |  |  |  |  |
Commercial-Office [Member] | Mendota Office Center II - Mendota Heights, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,595,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,121,000 |  |  |  |  |
Buildings & Improvements | 10,085,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,712,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,121,000 |  |  |  |  |
Buildings & Improvements | 11,797,000 |  |  |  |  |
Total | 12,918,000 |  |  |  |  |
Accumulated Depreciation | (4,531,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,918,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,531,000 |  |  |  |  |
Commercial-Office [Member] | Mendota Office Center III - Mendota Heights, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,845,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 970,000 |  |  |  |  |
Buildings & Improvements | 5,734,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 881,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 970,000 |  |  |  |  |
Buildings & Improvements | 6,615,000 |  |  |  |  |
Total | 7,585,000 |  |  |  |  |
Accumulated Depreciation | (2,129,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,585,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,129,000 |  |  |  |  |
Commercial-Office [Member] | Mendota Office Center IV - Mendota Heights, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,571,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,070,000 |  |  |  |  |
Buildings & Improvements | 7,635,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,287,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,070,000 |  |  |  |  |
Buildings & Improvements | 8,922,000 |  |  |  |  |
Total | 9,992,000 |  |  |  |  |
Accumulated Depreciation | (2,951,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,992,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,951,000 |  |  |  |  |
Commercial-Office [Member] | Minnesota National Bank - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 707,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (413,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,965,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 413,000 |  |  |  |  |
Commercial-Office [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 |  |  |  |  |
Accumulated Depreciation | (214,000) |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,318,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 214,000 |  |  |  |  |
Commercial-Office [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 | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,974,000 |  |  |  |  |
Buildings & Improvements | 5,726,000 |  |  |  |  |
Total | 7,700,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,700,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Commercial-Office [Member] | Northgate I - Maple Grove, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,977,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,062,000 |  |  |  |  |
Buildings & Improvements | 6,358,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 990,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,235,000 |  |  |  |  |
Buildings & Improvements | 7,175,000 |  |  |  |  |
Total | 8,410,000 |  |  |  |  |
Accumulated Depreciation | (1,850,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,410,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,850,000 |  |  |  |  |
Commercial-Office [Member] | Northgate II - Maple Grove, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 917,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 359,000 |  |  |  |  |
Buildings & Improvements | 1,944,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 284,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 403,000 |  |  |  |  |
Buildings & Improvements | 2,184,000 |  |  |  |  |
Total | 2,587,000 |  |  |  |  |
Accumulated Depreciation | (845,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,587,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 845,000 |  |  |  |  |
Commercial-Office [Member] | Northpark Corporate Center - Arden Hills, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 11,938,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,034,000 |  |  |  |  |
Buildings & Improvements | 14,584,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,413,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,037,000 |  |  |  |  |
Buildings & Improvements | 16,994,000 |  |  |  |  |
Total | 19,031,000 |  |  |  |  |
Accumulated Depreciation | (3,650,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 19,031,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,650,000 |  |  |  |  |
Commercial-Office [Member] | Omaha 10802 Farnam Dr - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,182,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (397,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,228,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 397,000 |  |  |  |  |
Commercial-Office [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 | 33,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 4,220,000 |  |  |  |  |
Buildings & Improvements | 6,313,000 |  |  |  |  |
Total | 10,533,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 10,533,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Commercial-Office [Member] | Plaza 16 - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,271,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 389,000 |  |  |  |  |
Buildings & Improvements | 5,444,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,860,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 598,000 |  |  |  |  |
Buildings & Improvements | 9,095,000 |  |  |  |  |
Total | 9,693,000 |  |  |  |  |
Accumulated Depreciation | (1,665,000) |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,693,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,665,000 |  |  |  |  |
Commercial-Office [Member] | Plaza VII - Boise, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 930,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 300,000 |  |  |  |  |
Buildings & Improvements | 3,058,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 471,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 370,000 |  |  |  |  |
Buildings & Improvements | 3,459,000 |  |  |  |  |
Total | 3,829,000 |  |  |  |  |
Accumulated Depreciation | (1,122,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,829,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,122,000 |  |  |  |  |
Commercial-Office [Member] | Plymouth 5095 Nathan Lane - Plymouth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,182,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 604,000 |  |  |  |  |
Buildings & Improvements | 1,253,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 82,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 636,000 |  |  |  |  |
Buildings & Improvements | 1,303,000 |  |  |  |  |
Total | 1,939,000 |  |  |  |  |
Accumulated Depreciation | (224,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,939,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 224,000 |  |  |  |  |
Commercial-Office [Member] | Plymouth I - Plymouth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,115,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 530,000 |  |  |  |  |
Buildings & Improvements | 1,133,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 65,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 530,000 |  |  |  |  |
Buildings & Improvements | 1,198,000 |  |  |  |  |
Total | 1,728,000 |  |  |  |  |
Accumulated Depreciation | (307,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,728,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 307,000 |  |  |  |  |
Commercial-Office [Member] | Plymouth II - Plymouth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,115,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 367,000 |  |  |  |  |
Buildings & Improvements | 1,264,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 40,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 367,000 |  |  |  |  |
Buildings & Improvements | 1,304,000 |  |  |  |  |
Total | 1,671,000 |  |  |  |  |
Accumulated Depreciation | (342,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,671,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 342,000 |  |  |  |  |
Commercial-Office [Member] | Plymouth III - Plymouth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,373,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 507,000 |  |  |  |  |
Buildings & Improvements | 1,495,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 365,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 507,000 |  |  |  |  |
Buildings & Improvements | 1,860,000 |  |  |  |  |
Total | 2,367,000 |  |  |  |  |
Accumulated Depreciation | (563,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,367,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 563,000 |  |  |  |  |
Commercial-Office [Member] | Plymouth IV & V - Plymouth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,717,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,336,000 |  |  |  |  |
Buildings & Improvements | 12,693,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,085,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,338,000 |  |  |  |  |
Buildings & Improvements | 14,776,000 |  |  |  |  |
Total | 16,114,000 |  |  |  |  |
Accumulated Depreciation | (5,204,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 16,114,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,204,000 |  |  |  |  |
Commercial-Office [Member] | Prairie Oak Business Center - Eden Prairie, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,215,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 531,000 |  |  |  |  |
Buildings & Improvements | 4,069,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,216,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 784,000 |  |  |  |  |
Buildings & Improvements | 6,032,000 |  |  |  |  |
Total | 6,816,000 |  |  |  |  |
Accumulated Depreciation | (2,138,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,816,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,138,000 |  |  |  |  |
Commercial-Office [Member] | Rapid City 900 Concourse Drive - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 696,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 285,000 |  |  |  |  |
Buildings & Improvements | 6,600,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,028,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 514,000 |  |  |  |  |
Buildings & Improvements | 7,399,000 |  |  |  |  |
Total | 7,913,000 |  |  |  |  |
Accumulated Depreciation | (2,584,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,913,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,584,000 |  |  |  |  |
Commercial-Office [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 | 107,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,891,000 |  |  |  |  |
Buildings & Improvements | 6,216,000 |  |  |  |  |
Total | 8,107,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,107,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Commercial-Office [Member] | Southeast Tech Center - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,651,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 560,000 |  |  |  |  |
Buildings & Improvements | 5,496,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 419,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 569,000 |  |  |  |  |
Buildings & Improvements | 5,906,000 |  |  |  |  |
Total | 6,475,000 |  |  |  |  |
Accumulated Depreciation | (2,302,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,475,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,302,000 |  |  |  |  |
Commercial-Office [Member] | Spring Valley IV - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 748,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (235,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,154,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 235,000 |  |  |  |  |
Commercial-Office [Member] | Spring Valley V - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 823,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (342,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,586,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 342,000 |  |  |  |  |
Commercial-Office [Member] | Spring Valley X - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 763,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 180,000 |  |  |  |  |
Buildings & Improvements | 1,024,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 79,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 189,000 |  |  |  |  |
Buildings & Improvements | 1,094,000 |  |  |  |  |
Total | 1,283,000 |  |  |  |  |
Accumulated Depreciation | (246,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,283,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 246,000 |  |  |  |  |
Commercial-Office [Member] | Spring Valley XI - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 748,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (247,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,273,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 247,000 |  |  |  |  |
Commercial-Office [Member] | Superior Office Building - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,063,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 336,000 |  |  |  |  |
Buildings & Improvements | 2,200,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 83,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 336,000 |  |  |  |  |
Buildings & Improvements | 2,283,000 |  |  |  |  |
Total | 2,619,000 |  |  |  |  |
Accumulated Depreciation | (609,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,619,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 609,000 |  |  |  |  |
Commercial-Office [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 | 709,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 684,000 |  |  |  |  |
Buildings & Improvements | 9,223,000 |  |  |  |  |
Total | 9,907,000 |  |  |  |  |
Accumulated Depreciation | (2,406,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,907,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,406,000 |  |  |  |  |
Commercial-Office [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 | 1,972,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,348,000 |  |  |  |  |
Buildings & Improvements | 8,034,000 |  |  |  |  |
Total | 9,382,000 |  |  |  |  |
Accumulated Depreciation | (2,828,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,382,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,828,000 |  |  |  |  |
Commercial-Office [Member] | Thresher Square - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,094,000 |  |  |  |  |
Buildings & Improvements | 10,026,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,693,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,104,000 |  |  |  |  |
Buildings & Improvements | 11,709,000 |  |  |  |  |
Total | 12,813,000 |  |  |  |  |
Accumulated Depreciation | (3,963,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,813,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,963,000 |  |  |  |  |
Commercial-Office [Member] | Timberlands - Leawood, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,155,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,375,000 |  |  |  |  |
Buildings & Improvements | 9,601,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 36,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,375,000 |  |  |  |  |
Buildings & Improvements | 9,637,000 |  |  |  |  |
Total | 12,012,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,012,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Commercial-Office [Member] | UHC Office - International Falls, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 900,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 119,000 |  |  |  |  |
Buildings & Improvements | 2,366,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 80,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 119,000 |  |  |  |  |
Buildings & Improvements | 2,446,000 |  |  |  |  |
Total | 2,565,000 |  |  |  |  |
Accumulated Depreciation | (656,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,565,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 656,000 |  |  |  |  |
Commercial-Office [Member] | US Bank Financial Center - Bloomington, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,104,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,117,000 |  |  |  |  |
Buildings & Improvements | 13,350,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,586,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,119,000 |  |  |  |  |
Buildings & Improvements | 14,934,000 |  |  |  |  |
Total | 18,053,000 |  |  |  |  |
Accumulated Depreciation | (3,254,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 18,053,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,254,000 |  |  |  |  |
Commercial-Office [Member] | Wells Fargo Center - St Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,002,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 869,000 |  |  |  |  |
Buildings & Improvements | 8,373,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,448,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 869,000 |  |  |  |  |
Buildings & Improvements | 9,821,000 |  |  |  |  |
Total | 10,690,000 |  |  |  |  |
Accumulated Depreciation | (2,375,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 10,690,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,375,000 |  |  |  |  |
Commercial-Office [Member] | West River Business Park - Waite Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 491,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 235,000 |  |  |  |  |
Buildings & Improvements | 1,195,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 241,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 235,000 |  |  |  |  |
Buildings & Improvements | 1,436,000 |  |  |  |  |
Total | 1,671,000 |  |  |  |  |
Accumulated Depreciation | (371,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,671,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 371,000 |  |  |  |  |
Commercial-Office [Member] | Westgate - Boise, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,989,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (4,046,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 13,551,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,046,000 |  |  |  |  |
Commercial-Office [Member] | Whitewater Plaza - Minnetonka, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,762,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 530,000 |  |  |  |  |
Buildings & Improvements | 4,860,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,068,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 577,000 |  |  |  |  |
Buildings & Improvements | 5,881,000 |  |  |  |  |
Total | 6,458,000 |  |  |  |  |
Accumulated Depreciation | (1,982,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,458,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,982,000 |  |  |  |  |
Commercial-Office [Member] | Wirth Corporate Center - Golden Valley, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 970,000 |  |  |  |  |
Buildings & Improvements | 3,760,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 970,000 |  |  |  |  |
Buildings & Improvements | 3,760,000 |  |  |  |  |
Total | 4,730,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,730,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |
Commercial-Office [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 | 1,466,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 862,000 |  |  |  |  |
Buildings & Improvements | 5,984,000 |  |  |  |  |
Total | 6,846,000 |  |  |  |  |
Accumulated Depreciation | (1,261,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,846,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,261,000 |  |  |  |  |
Commercial-Office [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 |  |  |  |  |
Accumulated Depreciation | (1,670,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 11,573,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,670,000 |  |  |  |  |
Commercial-Office [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Additions | 0 |  | 0 |  | 0 |
Commercial Healthcare [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 243,714,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 33,906,000 |  |  |  |  |
Buildings & Improvements | 440,157,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 50,965,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 34,544,000 |  |  |  |  |
Buildings & Improvements | 490,484,000 |  |  |  |  |
Total | 525,028,000 |  |  |  |  |
Accumulated Depreciation | (105,843,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 525,028,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 105,843,000 |  |  |  |  |
Commercial Healthcare [Member] | 2800 Medical Building - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,203,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 204,000 |  |  |  |  |
Buildings & Improvements | 7,135,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,246,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 229,000 |  |  |  |  |
Buildings & Improvements | 9,356,000 |  |  |  |  |
Total | 9,585,000 |  |  |  |  |
Accumulated Depreciation | (2,691,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,585,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,691,000 |  |  |  |  |
Commercial Healthcare [Member] | 2828 Chicago Avenue - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,217,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (3,388,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 17,672,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,388,000 |  |  |  |  |
Commercial Healthcare [Member] | Airport Medical - Bloomington, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 769,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (1,614,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,678,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,614,000 |  |  |  |  |
Commercial Healthcare [Member] | Barry Pointe Office Park - Kansas City, MO [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,403,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 384,000 |  |  |  |  |
Buildings & Improvements | 2,366,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 143,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 392,000 |  |  |  |  |
Buildings & Improvements | 2,501,000 |  |  |  |  |
Total | 2,893,000 |  |  |  |  |
Accumulated Depreciation | (467,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,893,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 467,000 |  |  |  |  |
Commercial Healthcare [Member] | Billings 2300 Grant Road - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,447,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (115,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,865,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 115,000 |  |  |  |  |
Commercial Healthcare [Member] | Burnsville 303 Nicollet Medical (Ridgeview) - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,273,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,071,000 |  |  |  |  |
Buildings & Improvements | 6,842,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,602,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,071,000 |  |  |  |  |
Buildings & Improvements | 8,444,000 |  |  |  |  |
Total | 9,515,000 |  |  |  |  |
Accumulated Depreciation | (1,328,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,515,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,328,000 |  |  |  |  |
Commercial Healthcare [Member] | Burnsville 305 Nicollet Medical (Ridgeview South) - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,179,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 189,000 |  |  |  |  |
Buildings & Improvements | 5,127,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 956,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 189,000 |  |  |  |  |
Buildings & Improvements | 6,083,000 |  |  |  |  |
Total | 6,272,000 |  |  |  |  |
Accumulated Depreciation | (901,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,272,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 901,000 |  |  |  |  |
Commercial Healthcare [Member] | Casper 1930 E 12th Street (Park Place) - Casper, WY [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 439,000 |  |  |  |  |
Buildings & Improvements | 5,780,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 162,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 439,000 |  |  |  |  |
Buildings & Improvements | 5,942,000 |  |  |  |  |
Total | 6,381,000 |  |  |  |  |
Accumulated Depreciation | (692,000) |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,381,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 692,000 |  |  |  |  |
Commercial Healthcare [Member] | Casper 3955 E 12th Street (Meadow Wind) - Casper, WY [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 388,000 |  |  |  |  |
Buildings & Improvements | 10,494,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 181,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 459,000 |  |  |  |  |
Buildings & Improvements | 10,604,000 |  |  |  |  |
Total | 11,063,000 |  |  |  |  |
Accumulated Depreciation | (1,130,000) |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 11,063,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,130,000 |  |  |  |  |
Commercial Healthcare [Member] | Cheyenne 4010 N College Drive (Aspen Wind) - Cheyenne, WY [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 628,000 |  |  |  |  |
Buildings & Improvements | 10,272,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 260,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 629,000 |  |  |  |  |
Buildings & Improvements | 10,531,000 |  |  |  |  |
Total | 11,160,000 |  |  |  |  |
Accumulated Depreciation | (1,180,000) |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 11,160,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,180,000 |  |  |  |  |
Commercial Healthcare [Member] | Cheyenne 4606 N College Drive (Sierra Hills) - Cheyenne, WY [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 695,000 |  |  |  |  |
Buildings & Improvements | 7,455,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 40,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 695,000 |  |  |  |  |
Buildings & Improvements | 7,495,000 |  |  |  |  |
Total | 8,190,000 |  |  |  |  |
Accumulated Depreciation | (830,000) |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,190,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 830,000 |  |  |  |  |
Commercial Healthcare [Member] | Denfeld Clinic - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,546,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (653,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,099,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 653,000 |  |  |  |  |
Commercial Healthcare [Member] | Eagan 1440 Duckwood Medical - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 521,000 |  |  |  |  |
Buildings & Improvements | 1,547,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 519,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 521,000 |  |  |  |  |
Buildings & Improvements | 2,066,000 |  |  |  |  |
Total | 2,587,000 |  |  |  |  |
Accumulated Depreciation | (541,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,587,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 541,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Belgrade, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 35,000 |  |  |  |  |
Buildings & Improvements | 779,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 6,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 35,000 |  |  |  |  |
Buildings & Improvements | 785,000 |  |  |  |  |
Total | 820,000 |  |  |  |  |
Accumulated Depreciation | (120,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 820,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 120,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,844,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 115,000 |  |  |  |  |
Buildings & Improvements | 1,767,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 10,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 115,000 |  |  |  |  |
Buildings & Improvements | 1,777,000 |  |  |  |  |
Total | 1,892,000 |  |  |  |  |
Accumulated Depreciation | (275,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,892,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 275,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 511,000 |  |  |  |  |
Buildings & Improvements | 9,193,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 139,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 511,000 |  |  |  |  |
Buildings & Improvements | 9,332,000 |  |  |  |  |
Total | 9,843,000 |  |  |  |  |
Accumulated Depreciation | (1,993,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,843,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,993,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Brainerd, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 587,000 |  |  |  |  |
Buildings & Improvements | 8,999,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 79,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 587,000 |  |  |  |  |
Buildings & Improvements | 9,078,000 |  |  |  |  |
Total | 9,665,000 |  |  |  |  |
Accumulated Depreciation | (1,950,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,665,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,950,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Columbus, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 43,000 |  |  |  |  |
Buildings & Improvements | 824,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 44,000 |  |  |  |  |
Buildings & Improvements | 826,000 |  |  |  |  |
Total | 870,000 |  |  |  |  |
Accumulated Depreciation | (126,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 870,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 126,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - East Grand Forks, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,809,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 290,000 |  |  |  |  |
Buildings & Improvements | 1,352,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 24,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 290,000 |  |  |  |  |
Buildings & Improvements | 1,376,000 |  |  |  |  |
Total | 1,666,000 |  |  |  |  |
Accumulated Depreciation | (213,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,666,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 213,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Fargo, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 12,418,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 775,000 |  |  |  |  |
Buildings & Improvements | 20,870,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 13,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 775,000 |  |  |  |  |
Buildings & Improvements | 20,883,000 |  |  |  |  |
Total | 21,658,000 |  |  |  |  |
Accumulated Depreciation | (3,197,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 21,658,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,197,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Fremont, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 573,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 56,000 |  |  |  |  |
Buildings & Improvements | 490,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 43,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 56,000 |  |  |  |  |
Buildings & Improvements | 533,000 |  |  |  |  |
Total | 589,000 |  |  |  |  |
Accumulated Depreciation | (166,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 589,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 166,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Grand Island, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 33,000 |  |  |  |  |
Buildings & Improvements | 773,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 31,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 39,000 |  |  |  |  |
Buildings & Improvements | 798,000 |  |  |  |  |
Total | 837,000 |  |  |  |  |
Accumulated Depreciation | (120,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 837,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 120,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Hastings, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 590,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 49,000 |  |  |  |  |
Buildings & Improvements | 517,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 46,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 50,000 |  |  |  |  |
Buildings & Improvements | 562,000 |  |  |  |  |
Total | 612,000 |  |  |  |  |
Accumulated Depreciation | (181,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 612,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 181,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Hermantown I, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 15,823,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 288,000 |  |  |  |  |
Buildings & Improvements | 9,871,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,520,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 288,000 |  |  |  |  |
Buildings & Improvements | 11,391,000 |  |  |  |  |
Total | 11,679,000 |  |  |  |  |
Accumulated Depreciation | (3,589,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 11,679,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,589,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Hermantown II, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 719,000 |  |  |  |  |
Buildings & Improvements | 10,517,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 33,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 719,000 |  |  |  |  |
Buildings & Improvements | 10,550,000 |  |  |  |  |
Total | 11,269,000 |  |  |  |  |
Accumulated Depreciation | (2,273,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 11,269,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,273,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Kalispell, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 592,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 70,000 |  |  |  |  |
Buildings & Improvements | 502,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 615,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 70,000 |  |  |  |  |
Buildings & Improvements | 1,117,000 |  |  |  |  |
Total | 1,187,000 |  |  |  |  |
Accumulated Depreciation | (287,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,187,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 287,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 9,250,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,045,000 |  |  |  |  |
Buildings & Improvements | 11,590,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 77,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,047,000 |  |  |  |  |
Buildings & Improvements | 11,665,000 |  |  |  |  |
Total | 12,712,000 |  |  |  |  |
Accumulated Depreciation | (1,007,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,712,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,007,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Missoula, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 840,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 109,000 |  |  |  |  |
Buildings & Improvements | 854,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 74,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 116,000 |  |  |  |  |
Buildings & Improvements | 921,000 |  |  |  |  |
Total | 1,037,000 |  |  |  |  |
Accumulated Depreciation | (385,000) |  |  |  |  |
Year of Construction or Acquisition | 1996 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,037,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 385,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Norfolk, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 42,000 |  |  |  |  |
Buildings & Improvements | 722,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 9,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 42,000 |  |  |  |  |
Buildings & Improvements | 731,000 |  |  |  |  |
Total | 773,000 |  |  |  |  |
Accumulated Depreciation | (112,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 773,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 112,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 374,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 89,000 |  |  |  |  |
Buildings & Improvements | 547,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 45,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 89,000 |  |  |  |  |
Buildings & Improvements | 592,000 |  |  |  |  |
Total | 681,000 |  |  |  |  |
Accumulated Depreciation | (186,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 681,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 186,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,056,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 314,000 |  |  |  |  |
Buildings & Improvements | 974,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 40,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 314,000 |  |  |  |  |
Buildings & Improvements | 1,014,000 |  |  |  |  |
Total | 1,328,000 |  |  |  |  |
Accumulated Depreciation | (155,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,328,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 155,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Spearfish, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 315,000 |  |  |  |  |
Buildings & Improvements | 8,584,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 69,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 330,000 |  |  |  |  |
Buildings & Improvements | 8,638,000 |  |  |  |  |
Total | 8,968,000 |  |  |  |  |
Accumulated Depreciation | (1,489,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,968,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,489,000 |  |  |  |  |
Commercial Healthcare [Member] | Edgewood Vista - Virginia, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,460,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 246,000 |  |  |  |  |
Buildings & Improvements | 11,823,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 137,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 246,000 |  |  |  |  |
Buildings & Improvements | 11,960,000 |  |  |  |  |
Total | 12,206,000 |  |  |  |  |
Accumulated Depreciation | (3,357,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,206,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,357,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6363 France Medical - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 9,830,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 12,675,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,500,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 15,175,000 |  |  |  |  |
Total | 15,175,000 |  |  |  |  |
Accumulated Depreciation | (3,114,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 15,175,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,114,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6405 France Medical - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,473,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (2,532,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,242,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,532,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6517 Drew Avenue - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 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 |  |  |  |  |
Accumulated Depreciation | (519,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,542,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 519,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6525 Drew Avenue - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 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 |  |  |  |  |
Accumulated Depreciation | (7,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 505,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6525 France SMC II - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 9,991,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 755,000 |  |  |  |  |
Buildings & Improvements | 8,054,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 5,982,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,040,000 |  |  |  |  |
Buildings & Improvements | 13,751,000 |  |  |  |  |
Total | 14,791,000 |  |  |  |  |
Accumulated Depreciation | (5,805,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 14,791,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,805,000 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6545 France SMC I - Edina MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 30,219,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,480,000 |  |  |  |  |
Buildings & Improvements | 30,743,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 14,758,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,480,000 |  |  |  |  |
Buildings & Improvements | 45,501,000 |  |  |  |  |
Total | 48,981,000 |  |  |  |  |
Accumulated Depreciation | (16,225,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 48,981,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 16,225,000 |  |  |  |  |
Commercial Healthcare [Member] | Fresenius - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 648,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (382,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,572,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 382,000 |  |  |  |  |
Commercial Healthcare [Member] | Garden View - St. Paul, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 785,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 7,408,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 644,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 12,000 |  |  |  |  |
Buildings & Improvements | 8,040,000 |  |  |  |  |
Total | 8,052,000 |  |  |  |  |
Accumulated Depreciation | (2,466,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,052,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,466,000 |  |  |  |  |
Commercial Healthcare [Member] | Gateway Clinic - Sandstone, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 895,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 66,000 |  |  |  |  |
Buildings & Improvements | 1,699,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 66,000 |  |  |  |  |
Buildings & Improvements | 1,700,000 |  |  |  |  |
Total | 1,766,000 |  |  |  |  |
Accumulated Depreciation | (427,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,766,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 427,000 |  |  |  |  |
Commercial Healthcare [Member] | Healtheast St John & Woodwinds - Maplewood & Woodbury, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,947,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (6,407,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 21,601,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,407,000 |  |  |  |  |
Commercial Healthcare [Member] | High Pointe Health Campus - Lake Elmo, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,500,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,305,000 |  |  |  |  |
Buildings & Improvements | 10,528,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,678,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,329,000 |  |  |  |  |
Buildings & Improvements | 12,182,000 |  |  |  |  |
Total | 13,511,000 |  |  |  |  |
Accumulated Depreciation | (3,320,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 13,511,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,320,000 |  |  |  |  |
Commercial Healthcare [Member] | Jamestown Medical Office Building - Jamestown, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,078,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 7,622,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 7,622,000 |  |  |  |  |
Total | 7,622,000 |  |  |  |  |
Accumulated Depreciation | (464,000) |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,622,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 464,000 |  |  |  |  |
Commercial Healthcare [Member] | Laramie 1072 N 22nd Street (Spring Wind) - Laramie, WY [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 406,000 |  |  |  |  |
Buildings & Improvements | 10,151,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 17,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 406,000 |  |  |  |  |
Buildings & Improvements | 10,168,000 |  |  |  |  |
Total | 10,574,000 |  |  |  |  |
Accumulated Depreciation | (941,000) |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 10,574,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 941,000 |  |  |  |  |
Commercial Healthcare [Member] | Legends at Heritage Place - Sartell, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 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 |  |  |  |  |
Accumulated Depreciation | (134,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 10,890,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 134,000 |  |  |  |  |
Commercial Healthcare [Member] | Mariner Clinic - Superior, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,958,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (974,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,871,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 974,000 |  |  |  |  |
Commercial Healthcare [Member] | Minneapolis 701 25th Avenue Medical - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,368,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 7,873,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,551,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 9,424,000 |  |  |  |  |
Total | 9,424,000 |  |  |  |  |
Accumulated Depreciation | (1,471,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,424,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,471,000 |  |  |  |  |
Commercial Healthcare [Member] | Missoula 3050 Great Northern - Missoula, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,510,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (126,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,971,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 126,000 |  |  |  |  |
Commercial Healthcare [Member] | Nebraska Orthopaedic Hospital - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 11,516,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 20,272,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,615,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 21,887,000 |  |  |  |  |
Total | 21,887,000 |  |  |  |  |
Accumulated Depreciation | (5,353,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 21,887,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,353,000 |  |  |  |  |
Commercial Healthcare [Member] | Park Dental - Brooklyn Center, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 441,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (804,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,952,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 804,000 |  |  |  |  |
Commercial Healthcare [Member] | Pavilion I - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,159,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (2,219,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 10,174,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,219,000 |  |  |  |  |
Commercial Healthcare [Member] | Pavilion II - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 9,494,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (5,264,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 19,325,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,264,000 |  |  |  |  |
Commercial Healthcare [Member] | Ritchie Medical Plaza - St Paul, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,228,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,615,000 |  |  |  |  |
Buildings & Improvements | 7,851,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,481,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,647,000 |  |  |  |  |
Buildings & Improvements | 11,300,000 |  |  |  |  |
Total | 12,947,000 |  |  |  |  |
Accumulated Depreciation | (2,350,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,947,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,350,000 |  |  |  |  |
Commercial Healthcare [Member] | Sartell 2000 23rd Street South - Sartell, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,456,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (3,782,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 12,715,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,782,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek American Falls- American Falls, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,210,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (292,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,015,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 292,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Boise - Boise, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,857,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (348,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,004,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 348,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Eagle - Eagle, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,034,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (286,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,038,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 286,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek Fruitland - Fruitland, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 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 |  |  |  |  |
Accumulated Depreciation | (57,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,115,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 57,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Meridian - Meridian, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,360,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (504,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,148,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 504,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Overland - Overland, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,225,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (465,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,629,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 465,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Soda Springs - Soda Springs, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 796,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (165,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,223,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 165,000 |  |  |  |  |
Commercial Healthcare [Member] | Spring Creek-Ustick - Meridian, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 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 |  |  |  |  |
Accumulated Depreciation | (268,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,300,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 268,000 |  |  |  |  |
Commercial Healthcare [Member] | St Michael Clinic - St Michael, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,851,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (447,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,851,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 447,000 |  |  |  |  |
Commercial Healthcare [Member] | Trinity at Plaza 16 - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,854,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (588,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 9,702,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 588,000 |  |  |  |  |
Commercial Healthcare [Member] | Wells Clinic - Hibbing, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,365,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (626,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,661,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 626,000 |  |  |  |  |
Commercial Healthcare [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Additions | 18,005,000 |  | 11,122,000 |  | 47,408,000 |
Commercial-Industrial [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,780,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 12,098,000 |  |  |  |  |
Buildings & Improvements | 36,298,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 6,979,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 12,377,000 |  |  |  |  |
Buildings & Improvements | 42,998,000 |  |  |  |  |
Total | 55,375,000 |  |  |  |  |
Accumulated Depreciation | (10,198,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 55,375,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 10,198,000 |  |  |  |  |
Commercial-Industrial [Member] | Bloomington 2000 W 94th Street - Bloomington, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,133,000 |  |  |  |  |
Buildings & Improvements | 4,097,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,200,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,187,000 |  |  |  |  |
Buildings & Improvements | 5,243,000 |  |  |  |  |
Total | 7,430,000 |  |  |  |  |
Accumulated Depreciation | (1,197,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,430,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,197,000 |  |  |  |  |
Commercial-Industrial [Member] | Eagan 2785 & 2795 Highway 55 - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,058,000 |  |  |  |  |
Buildings & Improvements | 2,570,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 20,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,058,000 |  |  |  |  |
Buildings & Improvements | 2,590,000 |  |  |  |  |
Total | 5,648,000 |  |  |  |  |
Accumulated Depreciation | (401,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,648,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 401,000 |  |  |  |  |
Commercial-Industrial [Member] | Lexington Commerce Center - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,294,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 453,000 |  |  |  |  |
Buildings & Improvements | 4,352,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,982,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 480,000 |  |  |  |  |
Buildings & Improvements | 6,307,000 |  |  |  |  |
Total | 6,787,000 |  |  |  |  |
Accumulated Depreciation | (2,639,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,787,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,639,000 |  |  |  |  |
Commercial-Industrial [Member] | Minot IPS - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 416,000 |  |  |  |  |
Buildings & Improvements | 5,635,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 416,000 |  |  |  |  |
Buildings & Improvements | 5,635,000 |  |  |  |  |
Total | 6,051,000 |  |  |  |  |
Accumulated Depreciation | (212,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,051,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 212,000 |  |  |  |  |
Commercial-Industrial [Member] | Stone Container - Fargo, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 922,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (2,776,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,141,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,776,000 |  |  |  |  |
Commercial-Industrial [Member] | Roseville 3075 Long Lake Road - Roseville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 810,000 |  |  |  |  |
Buildings & Improvements | 526,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 106,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 810,000 |  |  |  |  |
Buildings & Improvements | 632,000 |  |  |  |  |
Total | 1,442,000 |  |  |  |  |
Accumulated Depreciation | (4,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,442,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,000 |  |  |  |  |
Commercial-Industrial [Member] | Urbandale 3900 106th Street - Urbandale, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 10,564,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,680,000 |  |  |  |  |
Buildings & Improvements | 9,893,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,683,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,863,000 |  |  |  |  |
Buildings & Improvements | 11,393,000 |  |  |  |  |
Total | 15,256,000 |  |  |  |  |
Accumulated Depreciation | (2,135,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 15,256,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,135,000 |  |  |  |  |
Commercial-Industrial [Member] | Woodbury 1865 Woodlane - Woodbury, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 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 |  |  |  |  |
Accumulated Depreciation | (834,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,620,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 834,000 |  |  |  |  |
Commercial-Industrial [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Additions | 0 |  | 5,900,000 |  | 0 |
Commercial Retail [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 26,621,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 16,924,000 |  |  |  |  |
Buildings & Improvements | 78,702,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 21,643,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 19,097,000 |  |  |  |  |
Buildings & Improvements | 98,172,000 |  |  |  |  |
Total | 117,269,000 |  |  |  |  |
Accumulated Depreciation | (28,255,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 117,269,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 28,255,000 |  |  |  |  |
Commercial Retail [Member] | 17 South Main - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 78,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (199,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 287,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 199,000 |  |  |  |  |
Commercial Retail [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 |  |  |  |  |
Accumulated Depreciation | (34,000) |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,306,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 34,000 |  |  |  |  |
Commercial Retail [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 | 205,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 208,000 |  |  |  |  |
Buildings & Improvements | 978,000 |  |  |  |  |
Total | 1,186,000 |  |  |  |  |
Accumulated Depreciation | (284,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,186,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 284,000 |  |  |  |  |
Commercial Retail [Member] | Champlin South Pond - Champlin, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,332,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 842,000 |  |  |  |  |
Buildings & Improvements | 2,703,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 95,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 866,000 |  |  |  |  |
Buildings & Improvements | 2,774,000 |  |  |  |  |
Total | 3,640,000 |  |  |  |  |
Accumulated Depreciation | (722,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,640,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 722,000 |  |  |  |  |
Commercial Retail [Member] | Chan West Village - Chanhassen, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 12,690,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 5,035,000 |  |  |  |  |
Buildings & Improvements | 14,665,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,025,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 5,624,000 |  |  |  |  |
Buildings & Improvements | 16,101,000 |  |  |  |  |
Total | 21,725,000 |  |  |  |  |
Accumulated Depreciation | (4,760,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 21,725,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,760,000 |  |  |  |  |
Commercial Retail [Member] | Dakota West Plaza - Minot , ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 356,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (108,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 615,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 108,000 |  |  |  |  |
Commercial Retail [Member] | Duluth 4615 Grand - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 612,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 130,000 |  |  |  |  |
Buildings & Improvements | 1,800,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 4,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 131,000 |  |  |  |  |
Buildings & Improvements | 1,803,000 |  |  |  |  |
Total | 1,934,000 |  |  |  |  |
Accumulated Depreciation | (453,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,934,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 453,000 |  |  |  |  |
Commercial Retail [Member] | Duluth Denfeld Retail - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,023,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 276,000 |  |  |  |  |
Buildings & Improvements | 4,699,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 162,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 297,000 |  |  |  |  |
Buildings & Improvements | 4,840,000 |  |  |  |  |
Total | 5,137,000 |  |  |  |  |
Accumulated Depreciation | (1,256,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,137,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,256,000 |  |  |  |  |
Commercial Retail [Member] | Fargo Express Community - Fargo, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 882,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 374,000 |  |  |  |  |
Buildings & Improvements | 1,420,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 777,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 386,000 |  |  |  |  |
Buildings & Improvements | 2,185,000 |  |  |  |  |
Total | 2,571,000 |  |  |  |  |
Accumulated Depreciation | (507,000) |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,571,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 507,000 |  |  |  |  |
Commercial Retail [Member] | Fargo Express Community - Fargo, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 2003 years |  |  |  |  |
Commercial Retail [Member] | Fargo Express Community - Fargo, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 2005 years |  |  |  |  |
Commercial Retail [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 |  |  |  |  |
Accumulated Depreciation | (132,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 509,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 132,000 |  |  |  |  |
Commercial Retail [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 | 1,099,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,480,000 |  |  |  |  |
Buildings & Improvements | 6,369,000 |  |  |  |  |
Total | 8,849,000 |  |  |  |  |
Accumulated Depreciation | (1,651,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,849,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,651,000 |  |  |  |  |
Commercial Retail [Member] | Grand Forks Carmike - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,426,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (1,152,000) |  |  |  |  |
Year of Construction or Acquisition | 1994 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,546,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,152,000 |  |  |  |  |
Commercial Retail [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 |  |  |  |  |
Accumulated Depreciation | (1,800,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,720,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,800,000 |  |  |  |  |
Commercial Retail [Member] | Jamestown Buffalo Mall - Jamestown, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,934,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 566,000 |  |  |  |  |
Buildings & Improvements | 5,551,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,848,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,114,000 |  |  |  |  |
Buildings & Improvements | 7,851,000 |  |  |  |  |
Total | 8,965,000 |  |  |  |  |
Accumulated Depreciation | (1,746,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,965,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,746,000 |  |  |  |  |
Commercial Retail [Member] | Jamestown Business Center - Jamestown, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 399,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 297,000 |  |  |  |  |
Buildings & Improvements | 1,023,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,330,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 333,000 |  |  |  |  |
Buildings & Improvements | 2,317,000 |  |  |  |  |
Total | 2,650,000 |  |  |  |  |
Accumulated Depreciation | (930,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,650,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 930,000 |  |  |  |  |
Commercial Retail [Member] | Kalispell Retail Center - Kalispell, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 971,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 250,000 |  |  |  |  |
Buildings & Improvements | 2,250,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 973,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 253,000 |  |  |  |  |
Buildings & Improvements | 3,220,000 |  |  |  |  |
Total | 3,473,000 |  |  |  |  |
Accumulated Depreciation | (840,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,473,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 840,000 |  |  |  |  |
Commercial Retail [Member] | Lakeville Strip Center - Lakeville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 874,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 46,000 |  |  |  |  |
Buildings & Improvements | 1,142,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 852,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 94,000 |  |  |  |  |
Buildings & Improvements | 1,946,000 |  |  |  |  |
Total | 2,040,000 |  |  |  |  |
Accumulated Depreciation | (667,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,040,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 667,000 |  |  |  |  |
Commercial Retail [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 | 5,462,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 116,000 |  |  |  |  |
Buildings & Improvements | 8,662,000 |  |  |  |  |
Total | 8,778,000 |  |  |  |  |
Accumulated Depreciation | (1,718,000) |  |  |  |  |
Year of Construction or Acquisition | 1973 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,778,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,718,000 |  |  |  |  |
Commercial Retail [Member] | Minot Plaza - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 777,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 50,000 |  |  |  |  |
Buildings & Improvements | 453,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 147,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 80,000 |  |  |  |  |
Buildings & Improvements | 570,000 |  |  |  |  |
Total | 650,000 |  |  |  |  |
Accumulated Depreciation | (317,000) |  |  |  |  |
Year of Construction or Acquisition | 1993 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 650,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 317,000 |  |  |  |  |
Commercial Retail [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 |  |  |  |  |
Accumulated Depreciation | (227,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 872,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 227,000 |  |  |  |  |
Commercial Retail [Member] | Omaha Barnes & Noble - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,267,000 |  |  |  |  |
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 |  |  |  |  |
Accumulated Depreciation | (1,433,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,699,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,433,000 |  |  |  |  |
Commercial Retail [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 |  |  |  |  |
Accumulated Depreciation | (107,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 452,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 107,000 |  |  |  |  |
Commercial Retail [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 | 597,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 385,000 |  |  |  |  |
Buildings & Improvements | 3,012,000 |  |  |  |  |
Total | 3,397,000 |  |  |  |  |
Accumulated Depreciation | (983,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,397,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 983,000 |  |  |  |  |
Commercial Retail [Member] | Rochester Maplewood Square - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,275,000 |  |  |  |  |
Buildings & Improvements | 8,610,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,089,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,652,000 |  |  |  |  |
Buildings & Improvements | 10,322,000 |  |  |  |  |
Total | 13,974,000 |  |  |  |  |
Accumulated Depreciation | (3,581,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 13,974,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,581,000 |  |  |  |  |
Commercial Retail [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 | 1,738,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 977,000 |  |  |  |  |
Buildings & Improvements | 7,181,000 |  |  |  |  |
Total | 8,158,000 |  |  |  |  |
Accumulated Depreciation | (1,729,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,158,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,729,000 |  |  |  |  |
Commercial Retail [Member] | Weston Retail - Weston, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 79,000 |  |  |  |  |
Buildings & Improvements | 1,575,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 27,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 80,000 |  |  |  |  |
Buildings & Improvements | 1,601,000 |  |  |  |  |
Total | 1,681,000 |  |  |  |  |
Accumulated Depreciation | (448,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,681,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 448,000 |  |  |  |  |
Commercial Retail [Member] | Weston Walgreens - Weston, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 66,000 |  |  |  |  |
Buildings & Improvements | 1,718,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 671,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 67,000 |  |  |  |  |
Buildings & Improvements | 2,388,000 |  |  |  |  |
Total | 2,455,000 |  |  |  |  |
Accumulated Depreciation | (471,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,455,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 471,000 |  |  |  |  |
Commercial Retail [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Additions | 0 |  | 1,240,000 |  | 2,316,000 |
Subtotal [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 997,689,000 |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 185,371,000 |  |  |  |  |
Buildings & Improvements | 1,541,588,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 269,072,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 205,017,000 |  |  |  |  |
Buildings & Improvements | 1,791,014,000 |  |  |  |  |
Total | 1,996,031,000 |  |  |  |  |
Accumulated Depreciation | (424,288,000) |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,996,031,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 424,288,000 |  |  |  |  |
[1] | The net basis of the Company’s real estate investments for Federal Income Tax purposes was approximately $1.5 billion, $1.5 billion and $1.4 billion at April 30, 2014, 2013 and 2012, respectively.
[2] | (as revised)
[3] | Includes development projects that are placed in service in phases.
[4] | Consists of miscellaneous re-classed assets.
[5] | Consists of miscellaneous disposed assets.

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- Definition Amount of write-down or reserve recognized in the income statement on real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.FN5) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
Name: | us-gaap_SECScheduleIIIRealEstateWritedownOrReserveAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration