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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) (USD $) | 12 Months Ended
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Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | $ 1,049,206,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 223,909,000 |  |  |  |  |
Buildings & Improvements | 1,604,380,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 272,695,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 241,909,000 |  |  |  |  |
Buildings & Improvements | 1,859,075,000 |  |  |  |  |
Total | 2,100,984,000 |  |  |  |  |
Accumulated Depreciation | (420,421,000) |  |  |  |  |
Maximum borrowing capacity | 60,000,000 |  |  |  |  |
Advances under the facility specified as percentage of value of properties provided as security (in hundredths) | 60.00% |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at beginning of year | 1,892,009,000 | [2] | 1,770,798,000 | [2] | 1,800,519,000 |
Additions during year [Abstract] |  |  |  |  |  |
Improvements and Other | 36,375,000 |  | 35,176,000 |  | 23,183,000 |
Total Additions | 2,060,505,000 |  | 1,903,131,000 |  | 1,865,080,000 |
Deductions during year [Abstract] |  |  |  |  |  |
Cost of real estate sold | (21,953,000) |  | (3,498,000) |  | (86,994,000) |
Impairment charge | (305,000) |  | (127,000) |  | 0 |
Other | (5,277,000) | [3] | (7,497,000) | [3] | (7,288,000) | [3]
Balance at close of year | 2,032,970,000 | [2] | 1,892,009,000 | [2] | 1,770,798,000 | [2]
Reconciliations of accumulated depreciation/amortization [Abstract] |  |  |  |  |  |
Balance at beginning of year | 373,490,000 |  | 328,952,000 |  | 308,626,000 |
Additions during year [Abstract] |  |  |  |  |  |
Provisions for depreciation | 56,611,000 |  | 51,093,000 |  | 49,375,000 |
Deductions during year [Abstract] |  |  |  |  |  |
Accumulated depreciation on real estate sold | (6,444,000) |  | (758,000) |  | (25,366,000) |
Other | (3,236,000) | [4] | (5,797,000) | [4] | (3,683,000) | [4]
Balance at close of year | 420,421,000 |  | 373,490,000 |  | 328,952,000 |
Net basis of real estate investments for federal income tax purposes | 1,500,000,000 |  | 1,400,000,000 |  | 1,200,000,000 |
Multi-Family Residential [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 376,225,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 46,532,000 |  |  |  |  |
Buildings & Improvements | 504,983,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 108,181,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 57,889,000 |  |  |  |  |
Buildings & Improvements | 601,807,000 |  |  |  |  |
Total | 659,696,000 |  |  |  |  |
Accumulated Depreciation | (140,354,000) |  |  |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Additions | 113,859,000 |  | 47,433,000 |  | 4,210,000 |
Multi-Family Residential [Member] | 11th Street 3 Plex - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 90,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 11,000 |  |  |  |  |
Buildings & Improvements | 53,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 12,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 16,000 |  |  |  |  |
Buildings & Improvements | 60,000 |  |  |  |  |
Total | 76,000 |  |  |  |  |
Accumulated Depreciation | (8,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | 4th Street 4 Plex - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 104,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 15,000 |  |  |  |  |
Buildings & Improvements | 74,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 21,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 23,000 |  |  |  |  |
Buildings & Improvements | 87,000 |  |  |  |  |
Total | 110,000 |  |  |  |  |
Accumulated Depreciation | (11,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Apartments on Main - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 688,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 158,000 |  |  |  |  |
Buildings & Improvements | 1,123,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 24,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 179,000 |  |  |  |  |
Buildings & Improvements | 1,126,000 |  |  |  |  |
Total | 1,305,000 |  |  |  |  |
Accumulated Depreciation | (164,000) |  |  |  |  |
Year of Construction or Acquisition | 1987 |  |  |  |  |
Multi-Family Residential [Member] | Apartments on Main - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Apartments on Main - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Arbors - S Sioux City, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,000,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 350,000 |  |  |  |  |
Buildings & Improvements | 6,625,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,281,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 614,000 |  |  |  |  |
Buildings & Improvements | 7,642,000 |  |  |  |  |
Total | 8,256,000 |  |  |  |  |
Accumulated Depreciation | (1,522,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Ashland - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,710,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 741,000 |  |  |  |  |
Buildings & Improvements | 7,569,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 46,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 756,000 |  |  |  |  |
Buildings & Improvements | 7,600,000 |  |  |  |  |
Total | 8,356,000 |  |  |  |  |
Accumulated Depreciation | (247,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Boulder Court - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,231,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,067,000 |  |  |  |  |
Buildings & Improvements | 5,498,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,596,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,293,000 |  |  |  |  |
Buildings & Improvements | 7,868,000 |  |  |  |  |
Total | 9,161,000 |  |  |  |  |
Accumulated Depreciation | (2,007,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Brookfield Village - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,385,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 509,000 |  |  |  |  |
Buildings & Improvements | 6,698,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,269,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 635,000 |  |  |  |  |
Buildings & Improvements | 7,841,000 |  |  |  |  |
Total | 8,476,000 |  |  |  |  |
Accumulated Depreciation | (1,957,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Brooklyn Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 800,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 145,000 |  |  |  |  |
Buildings & Improvements | 1,450,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 785,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 206,000 |  |  |  |  |
Buildings & Improvements | 2,174,000 |  |  |  |  |
Total | 2,380,000 |  |  |  |  |
Accumulated Depreciation | (804,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
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 | 1,280,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 395,000 |  |  |  |  |
Buildings & Improvements | 2,244,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 171,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 400,000 |  |  |  |  |
Buildings & Improvements | 2,410,000 |  |  |  |  |
Total | 2,810,000 |  |  |  |  |
Accumulated Depreciation | (388,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Campus Heights - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 110,000 |  |  |  |  |
Buildings & Improvements | 628,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 72,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 122,000 |  |  |  |  |
Buildings & Improvements | 688,000 |  |  |  |  |
Total | 810,000 |  |  |  |  |
Accumulated Depreciation | (113,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Campus Knoll - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 853,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 266,000 |  |  |  |  |
Buildings & Improvements | 1,512,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 96,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 273,000 |  |  |  |  |
Buildings & Improvements | 1,601,000 |  |  |  |  |
Total | 1,874,000 |  |  |  |  |
Accumulated Depreciation | (263,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Campus Plaza - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 54,000 | [5] |  |  |  |
Buildings & Improvements | 311,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 45,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 59,000 | [5] |  |  |  |
Buildings & Improvements | 351,000 | [5] |  |  |  |
Total | 410,000 | [5] |  |  |  |
Accumulated Depreciation | (59,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2007 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Multi-Family Residential [Member] | Campus Side - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 107,000 | [5] |  |  |  |
Buildings & Improvements | 615,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 85,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 116,000 | [5] |  |  |  |
Buildings & Improvements | 691,000 | [5] |  |  |  |
Total | 807,000 | [5] |  |  |  |
Accumulated Depreciation | (115,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2007 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Multi-Family Residential [Member] | Campus View - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 107,000 | [5] |  |  |  |
Buildings & Improvements | 615,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 79,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 111,000 | [5] |  |  |  |
Buildings & Improvements | 690,000 | [5] |  |  |  |
Total | 801,000 | [5] |  |  |  |
Accumulated Depreciation | (112,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2007 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Multi-Family Residential [Member] | Canyon Lake - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,942,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 305,000 |  |  |  |  |
Buildings & Improvements | 3,958,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,009,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 361,000 |  |  |  |  |
Buildings & Improvements | 4,911,000 |  |  |  |  |
Total | 5,272,000 |  |  |  |  |
Accumulated Depreciation | (1,357,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Castlerock - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,773,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 736,000 |  |  |  |  |
Buildings & Improvements | 4,864,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,816,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 961,000 |  |  |  |  |
Buildings & Improvements | 6,455,000 |  |  |  |  |
Total | 7,416,000 |  |  |  |  |
Accumulated Depreciation | (2,267,000) |  |  |  |  |
Year of Construction or Acquisition | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Chateau I -Minot ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 61,000 |  |  |  |  |
Buildings & Improvements | 5,663,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 326,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 61,000 |  |  |  |  |
Buildings & Improvements | 5,989,000 |  |  |  |  |
Total | 6,050,000 |  |  |  |  |
Accumulated Depreciation | (359,000) |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Cimarron Hills - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,879,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 706,000 |  |  |  |  |
Buildings & Improvements | 9,588,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 4,128,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,279,000 |  |  |  |  |
Buildings & Improvements | 13,143,000 |  |  |  |  |
Total | 14,422,000 |  |  |  |  |
Accumulated Depreciation | (3,948,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Colonial Villa - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,461,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,401,000 |  |  |  |  |
Buildings & Improvements | 11,515,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 4,259,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,797,000 |  |  |  |  |
Buildings & Improvements | 15,378,000 |  |  |  |  |
Total | 18,175,000 |  |  |  |  |
Accumulated Depreciation | (3,941,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Colony Lincoln, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,817,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,515,000 |  |  |  |  |
Buildings & Improvements | 15,731,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 107,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,526,000 |  |  |  |  |
Buildings & Improvements | 15,827,000 |  |  |  |  |
Total | 17,353,000 |  |  |  |  |
Accumulated Depreciation | (365,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Colton Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 450,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 80,000 |  |  |  |  |
Buildings & Improvements | 672,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 392,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 114,000 |  |  |  |  |
Buildings & Improvements | 1,030,000 |  |  |  |  |
Total | 1,144,000 |  |  |  |  |
Accumulated Depreciation | (697,000) |  |  |  |  |
Year of Construction or Acquisition | 1984 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Cornerstone - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 54,000 | [5] |  |  |  |
Buildings & Improvements | 311,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 48,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 55,000 | [5] |  |  |  |
Buildings & Improvements | 358,000 | [5] |  |  |  |
Total | 413,000 | [5] |  |  |  |
Accumulated Depreciation | (60,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2007 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Multi-Family Residential [Member] | Cottage West Twin Homes - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,704,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 968,000 |  |  |  |  |
Buildings & Improvements | 3,762,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 320,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 991,000 |  |  |  |  |
Buildings & Improvements | 4,059,000 |  |  |  |  |
Total | 5,050,000 |  |  |  |  |
Accumulated Depreciation | (155,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Cottonwood - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 16,007,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,056,000 |  |  |  |  |
Buildings & Improvements | 17,372,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,969,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,345,000 |  |  |  |  |
Buildings & Improvements | 20,052,000 |  |  |  |  |
Total | 21,397,000 |  |  |  |  |
Accumulated Depreciation | (5,812,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Country Meadows - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,790,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 491,000 |  |  |  |  |
Buildings & Improvements | 7,809,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,210,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 534,000 |  |  |  |  |
Buildings & Improvements | 8,976,000 |  |  |  |  |
Total | 9,510,000 |  |  |  |  |
Accumulated Depreciation | (3,241,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
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 | 3,990,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 235,000 |  |  |  |  |
Buildings & Improvements | 4,290,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,422,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 494,000 |  |  |  |  |
Buildings & Improvements | 5,453,000 |  |  |  |  |
Total | 5,947,000 |  |  |  |  |
Accumulated Depreciation | (2,571,000) |  |  |  |  |
Year of Construction or Acquisition | 1994 |  |  |  |  |
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 | 2,687,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 261,000 |  |  |  |  |
Buildings & Improvements | 3,289,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 171,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 266,000 |  |  |  |  |
Buildings & Improvements | 3,455,000 |  |  |  |  |
Total | 3,721,000 |  |  |  |  |
Accumulated Depreciation | (270,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Crown Colony - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,350,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 620,000 |  |  |  |  |
Buildings & Improvements | 9,956,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,010,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 817,000 |  |  |  |  |
Buildings & Improvements | 11,769,000 |  |  |  |  |
Total | 12,586,000 |  |  |  |  |
Accumulated Depreciation | (3,897,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | East Park - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 115,000 |  |  |  |  |
Buildings & Improvements | 2,405,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 728,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 156,000 |  |  |  |  |
Buildings & Improvements | 3,092,000 |  |  |  |  |
Total | 3,248,000 |  |  |  |  |
Accumulated Depreciation | (921,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Evergreen - Isanti, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,049,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 380,000 |  |  |  |  |
Buildings & Improvements | 2,740,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 64,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 380,000 |  |  |  |  |
Buildings & Improvements | 2,804,000 |  |  |  |  |
Total | 3,184,000 |  |  |  |  |
Accumulated Depreciation | (324,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Evergreen II - Isanti, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,148,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 691,000 |  |  |  |  |
Buildings & Improvements | 2,784,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 9,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 691,000 |  |  |  |  |
Buildings & Improvements | 2,793,000 |  |  |  |  |
Total | 3,484,000 |  |  |  |  |
Accumulated Depreciation | (117,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Fairmont - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 356,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 28,000 |  |  |  |  |
Buildings & Improvements | 337,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 51,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 53,000 |  |  |  |  |
Buildings & Improvements | 363,000 |  |  |  |  |
Total | 416,000 |  |  |  |  |
Accumulated Depreciation | (48,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | First Avenue - Minot ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 2,677,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 232,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 2,909,000 |  |  |  |  |
Total | 2,909,000 |  |  |  |  |
Accumulated Depreciation | (3,000) |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,816,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 810,000 |  |  |  |  |
Buildings & Improvements | 5,579,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 6,554,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,365,000 |  |  |  |  |
Buildings & Improvements | 11,578,000 |  |  |  |  |
Total | 12,943,000 |  |  |  |  |
Accumulated Depreciation | (4,462,000) |  |  |  |  |
Year of Construction or Acquisition | 1993 |  |  |  |  |
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Gables Townhomes - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,499,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 349,000 |  |  |  |  |
Buildings & Improvements | 1,921,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 134,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 366,000 |  |  |  |  |
Buildings & Improvements | 2,038,000 |  |  |  |  |
Total | 2,404,000 |  |  |  |  |
Accumulated Depreciation | (79,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Grand Gateway - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,580,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 814,000 |  |  |  |  |
Buildings & Improvements | 7,086,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 353,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 909,000 |  |  |  |  |
Buildings & Improvements | 7,344,000 |  |  |  |  |
Total | 8,253,000 |  |  |  |  |
Accumulated Depreciation | (256,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Greenfield - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,642,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 578,000 |  |  |  |  |
Buildings & Improvements | 4,122,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 586,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 775,000 |  |  |  |  |
Buildings & Improvements | 4,511,000 |  |  |  |  |
Total | 5,286,000 |  |  |  |  |
Accumulated Depreciation | (641,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Heritage Manor - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,198,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 403,000 |  |  |  |  |
Buildings & Improvements | 6,968,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,422,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 480,000 |  |  |  |  |
Buildings & Improvements | 9,313,000 |  |  |  |  |
Total | 9,793,000 |  |  |  |  |
Accumulated Depreciation | (3,206,000) |  |  |  |  |
Year of Construction or Acquisition | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Indian Hills - Sioux City, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 294,000 | [5] |  |  |  |
Buildings & Improvements | 2,921,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 3,309,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 375,000 | [5] |  |  |  |
Buildings & Improvements | 6,149,000 | [5] |  |  |  |
Total | 6,524,000 | [5] |  |  |  |
Accumulated Depreciation | (944,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2007 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,361,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 449,000 |  |  |  |  |
Buildings & Improvements | 2,725,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,443,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 546,000 |  |  |  |  |
Buildings & Improvements | 4,071,000 |  |  |  |  |
Total | 4,617,000 |  |  |  |  |
Accumulated Depreciation | (1,528,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
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 | 13,625,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,215,000 |  |  |  |  |
Buildings & Improvements | 15,837,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 88,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,216,000 |  |  |  |  |
Buildings & Improvements | 15,924,000 |  |  |  |  |
Total | 17,140,000 |  |  |  |  |
Accumulated Depreciation | (365,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Lancaster - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 762,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 289,000 |  |  |  |  |
Buildings & Improvements | 2,899,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 981,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 451,000 |  |  |  |  |
Buildings & Improvements | 3,718,000 |  |  |  |  |
Total | 4,169,000 |  |  |  |  |
Accumulated Depreciation | (1,329,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Landmark - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,700,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 184,000 |  |  |  |  |
Buildings & Improvements | 1,514,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 904,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 277,000 |  |  |  |  |
Buildings & Improvements | 2,325,000 |  |  |  |  |
Total | 2,602,000 |  |  |  |  |
Accumulated Depreciation | (896,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 16,222,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,362,000 |  |  |  |  |
Buildings & Improvements | 21,727,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 5,870,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,080,000 |  |  |  |  |
Buildings & Improvements | 26,879,000 |  |  |  |  |
Total | 28,959,000 |  |  |  |  |
Accumulated Depreciation | (8,591,000) |  |  |  |  |
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 | 3,022,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 399,000 |  |  |  |  |
Buildings & Improvements | 5,110,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 392,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 422,000 |  |  |  |  |
Buildings & Improvements | 5,479,000 |  |  |  |  |
Total | 5,901,000 |  |  |  |  |
Accumulated Depreciation | (1,185,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Meadows - Jamestown, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 590,000 | [5] |  |  |  |
Buildings & Improvements | 4,519,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 1,200,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 653,000 | [5] |  |  |  |
Buildings & Improvements | 5,656,000 | [5] |  |  |  |
Total | 6,309,000 | [5] |  |  |  |
Accumulated Depreciation | (1,811,000) | [5] |  |  |  |
Year of Construction or Acquisition | 1998 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Multi-Family Residential [Member] | Monticello Village - Monticello, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,886,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 490,000 |  |  |  |  |
Buildings & Improvements | 3,756,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 435,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 621,000 |  |  |  |  |
Buildings & Improvements | 4,060,000 |  |  |  |  |
Total | 4,681,000 |  |  |  |  |
Accumulated Depreciation | (1,016,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,478,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 303,000 |  |  |  |  |
Buildings & Improvements | 3,957,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 469,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 336,000 |  |  |  |  |
Buildings & Improvements | 4,393,000 |  |  |  |  |
Total | 4,729,000 |  |  |  |  |
Accumulated Depreciation | (1,206,000) |  |  |  |  |
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 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 110,000 |  |  |  |  |
Buildings & Improvements | 610,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 64,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 119,000 |  |  |  |  |
Buildings & Improvements | 665,000 |  |  |  |  |
Total | 784,000 |  |  |  |  |
Accumulated Depreciation | (54,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Oakmont Estates - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,524,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 423,000 |  |  |  |  |
Buildings & Improvements | 4,838,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 450,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 515,000 |  |  |  |  |
Buildings & Improvements | 5,196,000 |  |  |  |  |
Total | 5,711,000 |  |  |  |  |
Accumulated Depreciation | (1,464,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Oakwood Estates - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,107,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 543,000 |  |  |  |  |
Buildings & Improvements | 2,784,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 4,134,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 767,000 |  |  |  |  |
Buildings & Improvements | 6,694,000 |  |  |  |  |
Total | 7,461,000 |  |  |  |  |
Accumulated Depreciation | (2,830,000) |  |  |  |  |
Year of Construction or Acquisition | 1993 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Olympic Village - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 10,955,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,164,000 |  |  |  |  |
Buildings & Improvements | 10,441,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,563,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,624,000 |  |  |  |  |
Buildings & Improvements | 12,544,000 |  |  |  |  |
Total | 14,168,000 |  |  |  |  |
Accumulated Depreciation | (4,061,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Olympik Village - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,610,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,034,000 |  |  |  |  |
Buildings & Improvements | 6,109,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,493,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,154,000 |  |  |  |  |
Buildings & Improvements | 7,482,000 |  |  |  |  |
Total | 8,636,000 |  |  |  |  |
Accumulated Depreciation | (1,612,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,011,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 404,000 |  |  |  |  |
Buildings & Improvements | 3,152,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,468,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 563,000 |  |  |  |  |
Buildings & Improvements | 5,461,000 |  |  |  |  |
Total | 6,024,000 |  |  |  |  |
Accumulated Depreciation | (2,446,000) |  |  |  |  |
Year of Construction or Acquisition | 1994 |  |  |  |  |
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 | 8,581,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,143,000 |  |  |  |  |
Buildings & Improvements | 9,099,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 4,406,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,545,000 |  |  |  |  |
Buildings & Improvements | 13,103,000 |  |  |  |  |
Total | 14,648,000 |  |  |  |  |
Accumulated Depreciation | (5,283,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Pebble Springs - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 792,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 7,000 |  |  |  |  |
Buildings & Improvements | 748,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 132,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 44,000 |  |  |  |  |
Buildings & Improvements | 843,000 |  |  |  |  |
Total | 887,000 |  |  |  |  |
Accumulated Depreciation | (299,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Pinehurst - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 279,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 72,000 |  |  |  |  |
Buildings & Improvements | 687,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 229,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 77,000 |  |  |  |  |
Buildings & Improvements | 911,000 |  |  |  |  |
Total | 988,000 |  |  |  |  |
Accumulated Depreciation | (245,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Pines - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 128,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 35,000 |  |  |  |  |
Buildings & Improvements | 215,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 181,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 49,000 |  |  |  |  |
Buildings & Improvements | 382,000 |  |  |  |  |
Total | 431,000 |  |  |  |  |
Accumulated Depreciation | (121,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Plaza - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,602,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 867,000 |  |  |  |  |
Buildings & Improvements | 12,784,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,246,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 986,000 |  |  |  |  |
Buildings & Improvements | 14,911,000 |  |  |  |  |
Total | 15,897,000 |  |  |  |  |
Accumulated Depreciation | (1,635,000) |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,731,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 240,000 |  |  |  |  |
Buildings & Improvements | 3,538,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,453,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 363,000 |  |  |  |  |
Buildings & Improvements | 4,868,000 |  |  |  |  |
Total | 5,231,000 |  |  |  |  |
Accumulated Depreciation | (2,095,000) |  |  |  |  |
Year of Construction or Acquisition | 1994 |  |  |  |  |
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 | 4,045,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 395,000 |  |  |  |  |
Buildings & Improvements | 4,564,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 105,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 395,000 |  |  |  |  |
Buildings & Improvements | 4,669,000 |  |  |  |  |
Total | 5,064,000 |  |  |  |  |
Accumulated Depreciation | (73,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,464,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 144,000 |  |  |  |  |
Buildings & Improvements | 1,816,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 436,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 226,000 |  |  |  |  |
Buildings & Improvements | 2,170,000 |  |  |  |  |
Total | 2,396,000 |  |  |  |  |
Accumulated Depreciation | (1,107,000) |  |  |  |  |
Year of Construction or Acquisition | 1993 |  |  |  |  |
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 | 11,599,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,312,000 |  |  |  |  |
Buildings & Improvements | 13,362,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 964,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,347,000 |  |  |  |  |
Buildings & Improvements | 14,291,000 |  |  |  |  |
Total | 15,638,000 |  |  |  |  |
Accumulated Depreciation | (2,385,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Quarry Ridge 2 - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 942,000 |  |  |  |  |
Buildings & Improvements | 16,677,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 19,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 942,000 |  |  |  |  |
Buildings & Improvements | 16,696,000 |  |  |  |  |
Total | 17,638,000 |  |  |  |  |
Accumulated Depreciation | (385,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Regency Park Estates - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,966,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 702,000 |  |  |  |  |
Buildings & Improvements | 10,198,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 638,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 723,000 |  |  |  |  |
Buildings & Improvements | 10,815,000 |  |  |  |  |
Total | 11,538,000 |  |  |  |  |
Accumulated Depreciation | (474,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Ridge Oaks - Sioux City, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,466,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 178,000 |  |  |  |  |
Buildings & Improvements | 4,073,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,017,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 272,000 |  |  |  |  |
Buildings & Improvements | 5,996,000 |  |  |  |  |
Total | 6,268,000 |  |  |  |  |
Accumulated Depreciation | (1,883,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Rimrock West - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,392,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 330,000 |  |  |  |  |
Buildings & Improvements | 3,489,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,413,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 431,000 |  |  |  |  |
Buildings & Improvements | 4,801,000 |  |  |  |  |
Total | 5,232,000 |  |  |  |  |
Accumulated Depreciation | (1,483,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Rocky Meadows - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,260,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 656,000 |  |  |  |  |
Buildings & Improvements | 5,726,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 996,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 767,000 |  |  |  |  |
Buildings & Improvements | 6,611,000 |  |  |  |  |
Total | 7,378,000 |  |  |  |  |
Accumulated Depreciation | (2,756,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Rum River - Isanti, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,677,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 843,000 |  |  |  |  |
Buildings & Improvements | 4,823,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 105,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 848,000 |  |  |  |  |
Buildings & Improvements | 4,923,000 |  |  |  |  |
Total | 5,771,000 |  |  |  |  |
Accumulated Depreciation | (749,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Sherwood - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 12,534,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,142,000 |  |  |  |  |
Buildings & Improvements | 14,684,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,729,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,590,000 |  |  |  |  |
Buildings & Improvements | 16,965,000 |  |  |  |  |
Total | 18,555,000 |  |  |  |  |
Accumulated Depreciation | (5,699,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Sierra Vista - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,450,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 241,000 |  |  |  |  |
Buildings & Improvements | 2,097,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 322,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 251,000 |  |  |  |  |
Buildings & Improvements | 2,409,000 |  |  |  |  |
Total | 2,660,000 |  |  |  |  |
Accumulated Depreciation | (129,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,954,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 550,000 |  |  |  |  |
Buildings & Improvements | 9,548,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,351,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,305,000 |  |  |  |  |
Buildings & Improvements | 11,144,000 |  |  |  |  |
Total | 12,449,000 |  |  |  |  |
Accumulated Depreciation | (4,802,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
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 | 1,082,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 185,000 |  |  |  |  |
Buildings & Improvements | 469,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 314,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 236,000 |  |  |  |  |
Buildings & Improvements | 732,000 |  |  |  |  |
Total | 968,000 |  |  |  |  |
Accumulated Depreciation | (313,000) |  |  |  |  |
Year of Construction or Acquisition | 1994 |  |  |  |  |
Multi-Family Residential [Member] | Southview - 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] | Southview - 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] | Southwind - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,719,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 400,000 |  |  |  |  |
Buildings & Improvements | 5,034,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,627,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 719,000 |  |  |  |  |
Buildings & Improvements | 7,342,000 |  |  |  |  |
Total | 8,061,000 |  |  |  |  |
Accumulated Depreciation | (3,037,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
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 | 1,110,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 161,000 |  |  |  |  |
Buildings & Improvements | 1,898,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,145,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 292,000 |  |  |  |  |
Buildings & Improvements | 2,912,000 |  |  |  |  |
Total | 3,204,000 |  |  |  |  |
Accumulated Depreciation | (1,064,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
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 | 8,259,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 336,000 |  |  |  |  |
Buildings & Improvements | 12,814,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,322,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 536,000 |  |  |  |  |
Buildings & Improvements | 14,936,000 |  |  |  |  |
Total | 15,472,000 |  |  |  |  |
Accumulated Depreciation | (4,572,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Sycamore Village - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 101,000 |  |  |  |  |
Buildings & Improvements | 1,317,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 470,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 152,000 |  |  |  |  |
Buildings & Improvements | 1,736,000 |  |  |  |  |
Total | 1,888,000 |  |  |  |  |
Accumulated Depreciation | (536,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Temple - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 81,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 228,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 228,000 |  |  |  |  |
Total | 228,000 |  |  |  |  |
Accumulated Depreciation | (42,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Terrace Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 185,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 29,000 |  |  |  |  |
Buildings & Improvements | 312,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 83,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 40,000 |  |  |  |  |
Buildings & Improvements | 384,000 |  |  |  |  |
Total | 424,000 |  |  |  |  |
Accumulated Depreciation | (153,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Thomasbrook - Lincoln, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,076,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 600,000 |  |  |  |  |
Buildings & Improvements | 10,306,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,871,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,151,000 |  |  |  |  |
Buildings & Improvements | 12,626,000 |  |  |  |  |
Total | 13,777,000 |  |  |  |  |
Accumulated Depreciation | (3,943,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | University Park Place - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 78,000 | [5] |  |  |  |
Buildings & Improvements | 450,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 73,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 80,000 | [5] |  |  |  |
Buildings & Improvements | 521,000 | [5] |  |  |  |
Total | 601,000 | [5] |  |  |  |
Accumulated Depreciation | (81,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2007 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Multi-Family Residential [Member] | Valley Park - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,946,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 294,000 |  |  |  |  |
Buildings & Improvements | 4,137,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,674,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 533,000 |  |  |  |  |
Buildings & Improvements | 6,572,000 |  |  |  |  |
Total | 7,105,000 |  |  |  |  |
Accumulated Depreciation | (2,178,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Villa West - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 12,446,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,590,000 |  |  |  |  |
Buildings & Improvements | 15,760,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 80,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,595,000 |  |  |  |  |
Buildings & Improvements | 15,835,000 |  |  |  |  |
Total | 17,430,000 |  |  |  |  |
Accumulated Depreciation | (393,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Village Green - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,237,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 234,000 |  |  |  |  |
Buildings & Improvements | 2,296,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 619,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 357,000 |  |  |  |  |
Buildings & Improvements | 2,792,000 |  |  |  |  |
Total | 3,149,000 |  |  |  |  |
Accumulated Depreciation | (728,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | West Stonehill - Waite Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,783,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 939,000 |  |  |  |  |
Buildings & Improvements | 10,167,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 4,654,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,378,000 |  |  |  |  |
Buildings & Improvements | 14,382,000 |  |  |  |  |
Total | 15,760,000 |  |  |  |  |
Accumulated Depreciation | (6,424,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Westridge - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,716,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 68,000 |  |  |  |  |
Buildings & Improvements | 1,887,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 90,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 74,000 |  |  |  |  |
Buildings & Improvements | 1,971,000 |  |  |  |  |
Total | 2,045,000 |  |  |  |  |
Accumulated Depreciation | (250,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Westwood Park - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,012,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 116,000 |  |  |  |  |
Buildings & Improvements | 1,909,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,673,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 260,000 |  |  |  |  |
Buildings & Improvements | 3,438,000 |  |  |  |  |
Total | 3,698,000 |  |  |  |  |
Accumulated Depreciation | (1,204,000) |  |  |  |  |
Year of Construction or Acquisition | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Whispering Ridge - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 22,000,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,139,000 |  |  |  |  |
Buildings & Improvements | 25,424,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,139,000 |  |  |  |  |
Buildings & Improvements | 25,424,000 |  |  |  |  |
Total | 27,563,000 |  |  |  |  |
Accumulated Depreciation | (82,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Williston Garden - Williston, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,523,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,400,000 |  |  |  |  |
Buildings & Improvements | 17,712,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,400,000 |  |  |  |  |
Buildings & Improvements | 17,712,000 |  |  |  |  |
Total | 19,112,000 |  |  |  |  |
Accumulated Depreciation | (704,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Winchester - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,028,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 748,000 |  |  |  |  |
Buildings & Improvements | 5,622,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,597,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,003,000 |  |  |  |  |
Buildings & Improvements | 6,964,000 |  |  |  |  |
Total | 7,967,000 |  |  |  |  |
Accumulated Depreciation | (1,839,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Woodridge - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,560,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 370,000 |  |  |  |  |
Buildings & Improvements | 6,028,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,754,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 485,000 |  |  |  |  |
Buildings & Improvements | 7,667,000 |  |  |  |  |
Total | 8,152,000 |  |  |  |  |
Accumulated Depreciation | (3,103,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 343,753,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 72,069,000 |  |  |  |  |
Buildings & Improvements | 472,083,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 69,623,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 75,222,000 |  |  |  |  |
Buildings & Improvements | 538,553,000 |  |  |  |  |
Total | 613,775,000 |  |  |  |  |
Accumulated Depreciation | (138,270,000) |  |  |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Additions | 0 |  | 0 |  | 6,836,000 |
Commercial-Office [Member] | 1st Avenue Building - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 30,000 |  |  |  |  |
Buildings & Improvements | 80,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | (41,000) |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 33,000 |  |  |  |  |
Buildings & Improvements | 36,000 |  |  |  |  |
Total | 69,000 |  |  |  |  |
Accumulated Depreciation | 245,000 |  |  |  |  |
Year of Construction or Acquisition | 1981 |  |  |  |  |
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 | 967,000 | [1] |  |  |  |
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 | (273,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | 610 Business Center IV - Brooklyn Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,011,000 | [1] |  |  |  |
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 | (1,711,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | 7800 West Brown Deer Road - Milwaukee, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 10,709,000 | [1] |  |  |  |
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 | (3,233,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | American Corporate Center - Mendota Heights, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,909,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 893,000 |  |  |  |  |
Buildings & Improvements | 16,768,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,908,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 893,000 |  |  |  |  |
Buildings & Improvements | 20,676,000 |  |  |  |  |
Total | 21,569,000 |  |  |  |  |
Accumulated Depreciation | (7,763,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Ameritrade - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,831,000 | [1] |  |  |  |
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 | (2,813,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Benton Business Park - Sauk Rapids, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 560,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 188,000 |  |  |  |  |
Buildings & Improvements | 1,261,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 86,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 188,000 |  |  |  |  |
Buildings & Improvements | 1,347,000 |  |  |  |  |
Total | 1,535,000 |  |  |  |  |
Accumulated Depreciation | (359,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Bismarck 715 East Broadway - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,218,000 | [1] |  |  |  |
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 | (287,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Bloomington Business Plaza - Bloomington, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,300,000 |  |  |  |  |
Buildings & Improvements | 6,106,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,625,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,313,000 |  |  |  |  |
Buildings & Improvements | 7,718,000 |  |  |  |  |
Total | 9,031,000 |  |  |  |  |
Accumulated Depreciation | (2,357,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Brenwood - Minnetonka, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,250,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,641,000 |  |  |  |  |
Buildings & Improvements | 12,138,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,547,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,650,000 |  |  |  |  |
Buildings & Improvements | 15,676,000 |  |  |  |  |
Total | 17,326,000 |  |  |  |  |
Accumulated Depreciation | (4,964,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Brook Valley I - La Vista, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,301,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 347,000 |  |  |  |  |
Buildings & Improvements | 1,671,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 81,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 347,000 |  |  |  |  |
Buildings & Improvements | 1,752,000 |  |  |  |  |
Total | 2,099,000 |  |  |  |  |
Accumulated Depreciation | (355,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Burnsville Bluffs II - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,719,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 300,000 |  |  |  |  |
Buildings & Improvements | 2,154,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 976,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 374,000 |  |  |  |  |
Buildings & Improvements | 3,056,000 |  |  |  |  |
Total | 3,430,000 |  |  |  |  |
Accumulated Depreciation | (1,236,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Cold Spring Center - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,661,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 588,000 |  |  |  |  |
Buildings & Improvements | 7,808,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,092,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 727,000 |  |  |  |  |
Buildings & Improvements | 8,761,000 |  |  |  |  |
Total | 9,488,000 |  |  |  |  |
Accumulated Depreciation | (2,913,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Corporate Center West - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 17,315,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,880,000 |  |  |  |  |
Buildings & Improvements | 17,509,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 957,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 4,167,000 |  |  |  |  |
Buildings & Improvements | 18,179,000 |  |  |  |  |
Total | 22,346,000 |  |  |  |  |
Accumulated Depreciation | (2,975,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Crosstown Centre - Eden Prairie, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,211,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,884,000 |  |  |  |  |
Buildings & Improvements | 14,569,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,473,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,919,000 |  |  |  |  |
Buildings & Improvements | 17,007,000 |  |  |  |  |
Total | 19,926,000 |  |  |  |  |
Accumulated Depreciation | (3,660,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Dewey Hill Business Center - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 985,000 |  |  |  |  |
Buildings & Improvements | 3,507,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 904,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 995,000 |  |  |  |  |
Buildings & Improvements | 4,401,000 |  |  |  |  |
Total | 5,396,000 |  |  |  |  |
Accumulated Depreciation | (1,643,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Farnam Executive Center - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 12,160,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,188,000 |  |  |  |  |
Buildings & Improvements | 11,404,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,188,000 |  |  |  |  |
Buildings & Improvements | 11,404,000 |  |  |  |  |
Total | 13,592,000 |  |  |  |  |
Accumulated Depreciation | (1,889,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Flagship - Eden Prairie, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 21,565,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,899,000 |  |  |  |  |
Buildings & Improvements | 21,638,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,424,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,094,000 |  |  |  |  |
Buildings & Improvements | 22,867,000 |  |  |  |  |
Total | 24,961,000 |  |  |  |  |
Accumulated Depreciation | (4,125,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Gateway Corporate Center - Woodbury, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,700,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,637,000 |  |  |  |  |
Buildings & Improvements | 7,763,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,065,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,675,000 |  |  |  |  |
Buildings & Improvements | 8,790,000 |  |  |  |  |
Total | 10,465,000 |  |  |  |  |
Accumulated Depreciation | (1,453,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Golden Hills Office Center - Golden Valley, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 17,988,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,018,000 |  |  |  |  |
Buildings & Improvements | 18,544,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,639,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,018,000 |  |  |  |  |
Buildings & Improvements | 22,183,000 |  |  |  |  |
Total | 25,201,000 |  |  |  |  |
Accumulated Depreciation | (7,236,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Great Plains - Fargo, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 126,000 |  |  |  |  |
Buildings & Improvements | 15,240,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 111,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 126,000 |  |  |  |  |
Buildings & Improvements | 15,351,000 |  |  |  |  |
Total | 15,477,000 |  |  |  |  |
Accumulated Depreciation | (5,232,000) |  |  |  |  |
Year of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Highlands Ranch I - Highlands Ranch, CO [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,221,000 | [1] |  |  |  |
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 | (1,549,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Highlands Ranch II - Highlands Ranch, CO [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,898,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,437,000 |  |  |  |  |
Buildings & Improvements | 9,549,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,527,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,437,000 |  |  |  |  |
Buildings & Improvements | 11,076,000 |  |  |  |  |
Total | 12,513,000 |  |  |  |  |
Accumulated Depreciation | (2,659,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Interlachen Corporate Center - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,857,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,650,000 |  |  |  |  |
Buildings & Improvements | 14,983,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,395,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,668,000 |  |  |  |  |
Buildings & Improvements | 17,360,000 |  |  |  |  |
Total | 19,028,000 |  |  |  |  |
Accumulated Depreciation | (4,990,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Intertech Building - Fenton, MO [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,418,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,130,000 |  |  |  |  |
Buildings & Improvements | 3,968,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,275,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,165,000 |  |  |  |  |
Buildings & Improvements | 5,208,000 |  |  |  |  |
Total | 7,373,000 |  |  |  |  |
Accumulated Depreciation | (696,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Mendota Office Center I - Mendota Heights, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,836,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 835,000 |  |  |  |  |
Buildings & Improvements | 6,169,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 853,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 835,000 |  |  |  |  |
Buildings & Improvements | 7,022,000 |  |  |  |  |
Total | 7,857,000 |  |  |  |  |
Accumulated Depreciation | (2,161,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Mendota Office Center II - Mendota Heights, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,668,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,121,000 |  |  |  |  |
Buildings & Improvements | 10,085,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,501,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,121,000 |  |  |  |  |
Buildings & Improvements | 11,586,000 |  |  |  |  |
Total | 12,707,000 |  |  |  |  |
Accumulated Depreciation | (4,185,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Mendota Office Center III - Mendota Heights, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,895,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 970,000 |  |  |  |  |
Buildings & Improvements | 5,734,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 697,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 970,000 |  |  |  |  |
Buildings & Improvements | 6,431,000 |  |  |  |  |
Total | 7,401,000 |  |  |  |  |
Accumulated Depreciation | (1,888,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Mendota Office Center IV - Mendota Heights, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,631,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,070,000 |  |  |  |  |
Buildings & Improvements | 7,635,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 578,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,070,000 |  |  |  |  |
Buildings & Improvements | 8,213,000 |  |  |  |  |
Total | 9,283,000 |  |  |  |  |
Accumulated Depreciation | (2,716,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Minnesota National Bank - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 781,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 287,000 |  |  |  |  |
Buildings & Improvements | 1,454,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 174,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 288,000 |  |  |  |  |
Buildings & Improvements | 1,627,000 |  |  |  |  |
Total | 1,915,000 |  |  |  |  |
Accumulated Depreciation | (352,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Minot 2505 16th Street SW - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 298,000 | [5] |  |  |  |
Buildings & Improvements | 1,724,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 296,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 298,000 | [5] |  |  |  |
Buildings & Improvements | 2,020,000 | [5] |  |  |  |
Total | 2,318,000 | [5] |  |  |  |
Accumulated Depreciation | (164,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2009 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Office [Member] | Miracle Hills One - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,895,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,974,000 |  |  |  |  |
Buildings & Improvements | 10,117,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,450,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,120,000 |  |  |  |  |
Buildings & Improvements | 11,421,000 |  |  |  |  |
Total | 13,541,000 |  |  |  |  |
Accumulated Depreciation | (2,446,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Nicollett VII - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 429,000 |  |  |  |  |
Buildings & Improvements | 6,931,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 410,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 436,000 |  |  |  |  |
Buildings & Improvements | 7,334,000 |  |  |  |  |
Total | 7,770,000 |  |  |  |  |
Accumulated Depreciation | (2,181,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Northgate I - Maple Grove, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,163,000 | [1] |  |  |  |
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 | (1,637,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Northgate II - Maple Grove, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 939,000 | [1] |  |  |  |
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 | (744,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Northpark Corporate Center - Arden Hills, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 12,332,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,034,000 |  |  |  |  |
Buildings & Improvements | 14,584,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,585,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,034,000 |  |  |  |  |
Buildings & Improvements | 16,169,000 |  |  |  |  |
Total | 18,203,000 |  |  |  |  |
Accumulated Depreciation | (3,104,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Omaha 10802 Farnam Dr - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,297,000 | [1] |  |  |  |
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 | (269,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Pacific Hills - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 16,770,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 4,220,000 |  |  |  |  |
Buildings & Improvements | 11,988,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,179,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 4,507,000 |  |  |  |  |
Buildings & Improvements | 13,880,000 |  |  |  |  |
Total | 18,387,000 |  |  |  |  |
Accumulated Depreciation | (2,604,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Pillsbury Business Center - Bloomington, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 284,000 |  |  |  |  |
Buildings & Improvements | 1,556,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 171,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 299,000 |  |  |  |  |
Buildings & Improvements | 1,712,000 |  |  |  |  |
Total | 2,011,000 |  |  |  |  |
Accumulated Depreciation | (551,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Plaza 16 - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,434,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 389,000 |  |  |  |  |
Buildings & Improvements | 5,444,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,843,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 591,000 |  |  |  |  |
Buildings & Improvements | 9,085,000 |  |  |  |  |
Total | 9,676,000 |  |  |  |  |
Accumulated Depreciation | (1,291,000) |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Plaza VII - Boise, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 993,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 300,000 |  |  |  |  |
Buildings & Improvements | 3,058,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 478,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 351,000 |  |  |  |  |
Buildings & Improvements | 3,485,000 |  |  |  |  |
Total | 3,836,000 |  |  |  |  |
Accumulated Depreciation | (1,027,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Plymouth 5095 Nathan Lane - Plymouth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,215,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 604,000 |  |  |  |  |
Buildings & Improvements | 1,253,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 83,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 636,000 |  |  |  |  |
Buildings & Improvements | 1,304,000 |  |  |  |  |
Total | 1,940,000 |  |  |  |  |
Accumulated Depreciation | (190,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Plymouth I - Plymouth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,157,000 | [1] |  |  |  |
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 | (274,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Plymouth II - Plymouth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,157,000 | [1] |  |  |  |
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 | (305,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Plymouth III - Plymouth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,425,000 | [1] |  |  |  |
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 | (490,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Plymouth IV & V - Plymouth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,875,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,336,000 |  |  |  |  |
Buildings & Improvements | 12,693,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,141,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,338,000 |  |  |  |  |
Buildings & Improvements | 14,832,000 |  |  |  |  |
Total | 16,170,000 |  |  |  |  |
Accumulated Depreciation | (4,771,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Prairie Oak Business Center - Eden Prairie, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,304,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 531,000 |  |  |  |  |
Buildings & Improvements | 4,069,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,852,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 764,000 |  |  |  |  |
Buildings & Improvements | 5,688,000 |  |  |  |  |
Total | 6,452,000 |  |  |  |  |
Accumulated Depreciation | (1,904,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Rapid City 900 Concourse Drive - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,171,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 285,000 |  |  |  |  |
Buildings & Improvements | 6,600,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 736,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 514,000 |  |  |  |  |
Buildings & Improvements | 7,107,000 |  |  |  |  |
Total | 7,621,000 |  |  |  |  |
Accumulated Depreciation | (2,275,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Riverport - Maryland Heights, MO [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 19,690,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,891,000 |  |  |  |  |
Buildings & Improvements | 18,982,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 554,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,917,000 |  |  |  |  |
Buildings & Improvements | 19,510,000 |  |  |  |  |
Total | 21,427,000 |  |  |  |  |
Accumulated Depreciation | (3,285,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Southeast Tech Center - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,691,000 | [1] |  |  |  |
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 | (2,133,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Spring Valley IV - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 775,000 | [1] |  |  |  |
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 | (212,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Spring Valley V - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 852,000 | [1] |  |  |  |
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 | (295,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Spring Valley X - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 790,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 180,000 |  |  |  |  |
Buildings & Improvements | 1,024,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 60,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 189,000 |  |  |  |  |
Buildings & Improvements | 1,075,000 |  |  |  |  |
Total | 1,264,000 |  |  |  |  |
Accumulated Depreciation | (212,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Spring Valley XI - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 775,000 | [1] |  |  |  |
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 | (218,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Superior Office Building - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,174,000 | [1] |  |  |  |
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 | (526,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | TCA Building - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,080,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 627,000 |  |  |  |  |
Buildings & Improvements | 8,571,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 911,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 684,000 |  |  |  |  |
Buildings & Improvements | 9,425,000 |  |  |  |  |
Total | 10,109,000 |  |  |  |  |
Accumulated Depreciation | (2,616,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Three Paramount Plaza - Bloomington, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,261,000 | [5] |  |  |  |
Buildings & Improvements | 6,149,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 1,755,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,298,000 | [5] |  |  |  |
Buildings & Improvements | 7,867,000 | [5] |  |  |  |
Total | 9,165,000 | [5] |  |  |  |
Accumulated Depreciation | (2,539,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2002 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Office [Member] | Thresher Square - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,094,000 |  |  |  |  |
Buildings & Improvements | 10,026,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,643,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,104,000 |  |  |  |  |
Buildings & Improvements | 11,659,000 |  |  |  |  |
Total | 12,763,000 |  |  |  |  |
Accumulated Depreciation | (3,648,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Timberlands - Leawood, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,155,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,375,000 |  |  |  |  |
Buildings & Improvements | 12,218,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,405,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,495,000 |  |  |  |  |
Buildings & Improvements | 13,503,000 |  |  |  |  |
Total | 15,998,000 |  |  |  |  |
Accumulated Depreciation | (2,603,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | UHC Office - International Falls, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 995,000 | [1] |  |  |  |
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 | (586,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | US Bank Financial Center - Bloomington, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,425,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,117,000 |  |  |  |  |
Buildings & Improvements | 13,350,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 610,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,119,000 |  |  |  |  |
Buildings & Improvements | 13,958,000 |  |  |  |  |
Total | 17,077,000 |  |  |  |  |
Accumulated Depreciation | (2,894,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Viromed - Eden Prairie, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 324,000 | [1] |  |  |  |
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 | (1,491,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Wells Fargo Center - St Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,206,000 | [1] |  |  |  |
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 | (2,087,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | West River Business Park - Waite Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 560,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 235,000 |  |  |  |  |
Buildings & Improvements | 1,195,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 50,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 235,000 |  |  |  |  |
Buildings & Improvements | 1,245,000 |  |  |  |  |
Total | 1,480,000 |  |  |  |  |
Accumulated Depreciation | (322,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Westgate - Boise, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,125,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,000,000 |  |  |  |  |
Buildings & Improvements | 10,618,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,921,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,000,000 |  |  |  |  |
Buildings & Improvements | 12,539,000 |  |  |  |  |
Total | 13,539,000 |  |  |  |  |
Accumulated Depreciation | (3,573,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Whitewater Plaza - Minnetonka, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,830,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 530,000 |  |  |  |  |
Buildings & Improvements | 4,860,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 850,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 577,000 |  |  |  |  |
Buildings & Improvements | 5,663,000 |  |  |  |  |
Total | 6,240,000 |  |  |  |  |
Accumulated Depreciation | (1,774,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Wirth Corporate Center - Golden Valley, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,539,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 970,000 |  |  |  |  |
Buildings & Improvements | 7,659,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 911,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 971,000 |  |  |  |  |
Buildings & Improvements | 8,569,000 |  |  |  |  |
Total | 9,540,000 |  |  |  |  |
Accumulated Depreciation | (2,568,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Office [Member] | Woodlands Plaza IV - Maryland Heights, MO [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,360,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 771,000 |  |  |  |  |
Buildings & Improvements | 4,609,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,441,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 837,000 |  |  |  |  |
Buildings & Improvements | 5,984,000 |  |  |  |  |
Total | 6,821,000 |  |  |  |  |
Accumulated Depreciation | (1,033,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 255,386,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 32,386,000 |  |  |  |  |
Buildings & Improvements | 423,642,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 45,163,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 32,847,000 |  |  |  |  |
Buildings & Improvements | 468,344,000 |  |  |  |  |
Total | 501,191,000 |  |  |  |  |
Accumulated Depreciation | (90,891,000) |  |  |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Additions | 11,122,000 |  | 47,408,000 |  | 19,249,000 |
Commercial-Healthcare [Member] | 2800 Medical Building - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,399,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 204,000 |  |  |  |  |
Buildings & Improvements | 7,135,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,191,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 229,000 |  |  |  |  |
Buildings & Improvements | 9,301,000 |  |  |  |  |
Total | 9,530,000 |  |  |  |  |
Accumulated Depreciation | (2,343,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | 2828 Chicago Avenue - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,379,000 | [1] |  |  |  |
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 | (2,764,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Airport Medical - Bloomington, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,083,000 | [1] |  |  |  |
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 | (1,497,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Barry Pointe Office Park - Kansas City, MO [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,435,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 384,000 |  |  |  |  |
Buildings & Improvements | 2,366,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 103,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 392,000 |  |  |  |  |
Buildings & Improvements | 2,461,000 |  |  |  |  |
Total | 2,853,000 |  |  |  |  |
Accumulated Depreciation | (398,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Billings 2300 Grant Road - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,645,000 | [1] |  |  |  |
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 | (85,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Burnsville 303 Nicollet Medical (Ridgeview) - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,445,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,071,000 |  |  |  |  |
Buildings & Improvements | 6,842,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,523,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,071,000 |  |  |  |  |
Buildings & Improvements | 8,365,000 |  |  |  |  |
Total | 9,436,000 |  |  |  |  |
Accumulated Depreciation | (1,054,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Burnsville 305 Nicollet Medical (Ridgeview South) - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,287,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 189,000 |  |  |  |  |
Buildings & Improvements | 5,127,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 768,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 189,000 |  |  |  |  |
Buildings & Improvements | 5,895,000 |  |  |  |  |
Total | 6,084,000 |  |  |  |  |
Accumulated Depreciation | (741,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Casper 1930 E 12th Street (Park Place) - Casper, WY [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 439,000 | [5] |  |  |  |
Buildings & Improvements | 5,780,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 162,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 439,000 | [5] |  |  |  |
Buildings & Improvements | 5,942,000 | [5] |  |  |  |
Total | 6,381,000 | [5] |  |  |  |
Accumulated Depreciation | (530,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2009 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Healthcare [Member] | Casper 3955 E 12th Street (Meadow Wind) - Casper, WY [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 388,000 | [5] |  |  |  |
Buildings & Improvements | 10,494,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 25,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 388,000 | [5] |  |  |  |
Buildings & Improvements | 10,519,000 | [5] |  |  |  |
Total | 10,907,000 | [5] |  |  |  |
Accumulated Depreciation | (775,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2009 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Healthcare [Member] | Cheyenne 4010 N College Drive (Aspen Wind) - Cheyenne, WY [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 628,000 | [5] |  |  |  |
Buildings & Improvements | 10,272,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 260,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 629,000 | [5] |  |  |  |
Buildings & Improvements | 10,531,000 | [5] |  |  |  |
Total | 11,160,000 | [5] |  |  |  |
Accumulated Depreciation | (903,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2009 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Healthcare [Member] | Cheyenne 4606 N College Drive (Sierra Hills) - Cheyenne, WY [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 695,000 | [5] |  |  |  |
Buildings & Improvements | 7,455,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 40,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 695,000 | [5] |  |  |  |
Buildings & Improvements | 7,495,000 | [5] |  |  |  |
Total | 8,190,000 | [5] |  |  |  |
Accumulated Depreciation | (639,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2009 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Healthcare [Member] | Denfeld Clinic - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,656,000 | [1] |  |  |  |
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 | (588,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Eagan 1440 Duckwood Medical - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,811,000 | [1] |  |  |  |
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 | (447,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Belgrade, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 35,000 |  |  |  |  |
Buildings & Improvements | 779,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 5,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 35,000 |  |  |  |  |
Buildings & Improvements | 784,000 |  |  |  |  |
Total | 819,000 |  |  |  |  |
Accumulated Depreciation | (100,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,905,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 115,000 |  |  |  |  |
Buildings & Improvements | 1,767,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 7,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 115,000 |  |  |  |  |
Buildings & Improvements | 1,774,000 |  |  |  |  |
Total | 1,889,000 |  |  |  |  |
Accumulated Depreciation | (231,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 511,000 |  |  |  |  |
Buildings & Improvements | 9,193,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 114,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 511,000 |  |  |  |  |
Buildings & Improvements | 9,307,000 |  |  |  |  |
Total | 9,818,000 |  |  |  |  |
Accumulated Depreciation | (1,758,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Brainerd, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 587,000 |  |  |  |  |
Buildings & Improvements | 8,999,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 54,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 587,000 |  |  |  |  |
Buildings & Improvements | 9,053,000 |  |  |  |  |
Total | 9,640,000 |  |  |  |  |
Accumulated Depreciation | (1,721,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Columbus, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 43,000 | [5] |  |  |  |
Buildings & Improvements | 824,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 3,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 44,000 | [5] |  |  |  |
Buildings & Improvements | 826,000 | [5] |  |  |  |
Total | 870,000 | [5] |  |  |  |
Accumulated Depreciation | (106,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2008 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - East Grand Forks, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,902,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 290,000 |  |  |  |  |
Buildings & Improvements | 1,352,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 15,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 290,000 |  |  |  |  |
Buildings & Improvements | 1,367,000 |  |  |  |  |
Total | 1,657,000 |  |  |  |  |
Accumulated Depreciation | (177,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Fargo, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 12,877,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 775,000 |  |  |  |  |
Buildings & Improvements | 20,870,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 9,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 775,000 |  |  |  |  |
Buildings & Improvements | 20,879,000 |  |  |  |  |
Total | 21,654,000 |  |  |  |  |
Accumulated Depreciation | (2,674,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Fremont, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 593,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 56,000 |  |  |  |  |
Buildings & Improvements | 490,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 42,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 56,000 |  |  |  |  |
Buildings & Improvements | 532,000 |  |  |  |  |
Total | 588,000 |  |  |  |  |
Accumulated Depreciation | (153,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Grand Island, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 33,000 | [5] |  |  |  |
Buildings & Improvements | 773,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 30,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 39,000 | [5] |  |  |  |
Buildings & Improvements | 797,000 | [5] |  |  |  |
Total | 836,000 | [5] |  |  |  |
Accumulated Depreciation | (100,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2008 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Hastings, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 611,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 49,000 |  |  |  |  |
Buildings & Improvements | 517,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 44,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 50,000 |  |  |  |  |
Buildings & Improvements | 560,000 |  |  |  |  |
Total | 610,000 |  |  |  |  |
Accumulated Depreciation | (167,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Hermantown I, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 16,382,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 288,000 |  |  |  |  |
Buildings & Improvements | 9,871,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,514,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 288,000 |  |  |  |  |
Buildings & Improvements | 11,385,000 |  |  |  |  |
Total | 11,673,000 |  |  |  |  |
Accumulated Depreciation | (3,304,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Hermantown II, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 | (2,009,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Kalispell, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 613,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 70,000 |  |  |  |  |
Buildings & Improvements | 502,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 603,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 70,000 |  |  |  |  |
Buildings & Improvements | 1,105,000 |  |  |  |  |
Total | 1,175,000 |  |  |  |  |
Accumulated Depreciation | (211,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 9,470,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,045,000 |  |  |  |  |
Buildings & Improvements | 11,590,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 70,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,047,000 |  |  |  |  |
Buildings & Improvements | 11,658,000 |  |  |  |  |
Total | 12,705,000 |  |  |  |  |
Accumulated Depreciation | (714,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Missoula, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 870,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 109,000 |  |  |  |  |
Buildings & Improvements | 854,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 72,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 116,000 |  |  |  |  |
Buildings & Improvements | 919,000 |  |  |  |  |
Total | 1,035,000 |  |  |  |  |
Accumulated Depreciation | (359,000) |  |  |  |  |
Year of Construction or Acquisition | 1996 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Norfolk, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 42,000 | [5] |  |  |  |
Buildings & Improvements | 722,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 7,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 42,000 | [5] |  |  |  |
Buildings & Improvements | 729,000 | [5] |  |  |  |
Total | 771,000 | [5] |  |  |  |
Accumulated Depreciation | (93,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2008 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 387,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 89,000 |  |  |  |  |
Buildings & Improvements | 547,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 42,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 89,000 |  |  |  |  |
Buildings & Improvements | 589,000 |  |  |  |  |
Total | 678,000 |  |  |  |  |
Accumulated Depreciation | (171,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,091,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 314,000 |  |  |  |  |
Buildings & Improvements | 974,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 12,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 314,000 |  |  |  |  |
Buildings & Improvements | 986,000 |  |  |  |  |
Total | 1,300,000 |  |  |  |  |
Accumulated Depreciation | (128,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Spearfish, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 315,000 |  |  |  |  |
Buildings & Improvements | 8,584,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 65,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 330,000 |  |  |  |  |
Buildings & Improvements | 8,634,000 |  |  |  |  |
Total | 8,964,000 |  |  |  |  |
Accumulated Depreciation | (1,271,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edgewood Vista - Virginia, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,932,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 246,000 |  |  |  |  |
Buildings & Improvements | 11,823,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 115,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 246,000 |  |  |  |  |
Buildings & Improvements | 11,938,000 |  |  |  |  |
Total | 12,184,000 |  |  |  |  |
Accumulated Depreciation | (3,056,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edina 6363 France Medical - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 10,000,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 12,675,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,762,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 14,437,000 |  |  |  |  |
Total | 14,437,000 |  |  |  |  |
Accumulated Depreciation | (2,458,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edina 6405 France Medical - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 8,782,000 | [1] |  |  |  |
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 | (2,097,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edina 6517 Drew Avenue - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,133,000 | [1] |  |  |  |
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 | (460,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edina 6525 Drew Avenue - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 | (4,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edina 6525 France SMC II - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 10,170,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 755,000 |  |  |  |  |
Buildings & Improvements | 8,054,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 6,018,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,040,000 |  |  |  |  |
Buildings & Improvements | 13,787,000 |  |  |  |  |
Total | 14,827,000 |  |  |  |  |
Accumulated Depreciation | (5,226,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Edina 6545 France SMC I - Edina MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 30,786,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,480,000 |  |  |  |  |
Buildings & Improvements | 30,743,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 12,464,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,480,000 |  |  |  |  |
Buildings & Improvements | 43,207,000 |  |  |  |  |
Total | 46,687,000 |  |  |  |  |
Accumulated Depreciation | (14,411,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Fresenius - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 716,000 | [1] |  |  |  |
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 | (344,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Garden View - St. Paul, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,320,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 7,408,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 709,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 12,000 |  |  |  |  |
Buildings & Improvements | 8,105,000 |  |  |  |  |
Total | 8,117,000 |  |  |  |  |
Accumulated Depreciation | (2,217,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Gateway Clinic - Sandstone, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 959,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 66,000 |  |  |  |  |
Buildings & Improvements | 1,699,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 66,000 |  |  |  |  |
Buildings & Improvements | 1,699,000 |  |  |  |  |
Total | 1,765,000 |  |  |  |  |
Accumulated Depreciation | (384,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Healtheast St John & Woodwinds - Maplewood & Woodbury, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 10,304,000 | [1] |  |  |  |
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 | (5,948,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | High Pointe Health Campus - Lake Elmo, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,400,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,305,000 |  |  |  |  |
Buildings & Improvements | 10,528,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,630,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,329,000 |  |  |  |  |
Buildings & Improvements | 12,134,000 |  |  |  |  |
Total | 13,463,000 |  |  |  |  |
Accumulated Depreciation | (2,888,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Jamestown Medical Office Building - Jamestown, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,200,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 7,605,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 7,605,000 |  |  |  |  |
Total | 7,605,000 |  |  |  |  |
Accumulated Depreciation | (76,000) |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Laramie 1072 N 22nd Street (Spring Wind) - Laramie, WY [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 406,000 | [5] |  |  |  |
Buildings & Improvements | 10,151,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 17,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 406,000 | [5] |  |  |  |
Buildings & Improvements | 10,168,000 | [5] |  |  |  |
Total | 10,574,000 | [5] |  |  |  |
Accumulated Depreciation | (631,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2009 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Healthcare [Member] | Mariner Clinic - Superior, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,097,000 | [1] |  |  |  |
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 | (871,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Minneapolis 701 25th Avenue Medical - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,532,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 7,873,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,093,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 8,966,000 |  |  |  |  |
Total | 8,966,000 |  |  |  |  |
Accumulated Depreciation | (1,133,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Missoula 3050 Great Northern - Missoula, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,727,000 | [1] |  |  |  |
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 | (93,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Nebraska Orthopedic Hospital - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 11,964,000 | [1] |  |  |  |
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 | (4,764,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Park Dental - Brooklyn Center, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 621,000 | [1] |  |  |  |
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 | (735,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Pavilion I - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 5,525,000 | [1] |  |  |  |
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 | (1,993,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Pavilion II - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 10,168,000 | [1] |  |  |  |
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 | (4,739,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Ritchie Medical Plaza - St Paul, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 6,463,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,615,000 |  |  |  |  |
Buildings & Improvements | 7,851,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,911,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,647,000 |  |  |  |  |
Buildings & Improvements | 9,730,000 |  |  |  |  |
Total | 11,377,000 |  |  |  |  |
Accumulated Depreciation | (1,952,000) |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Sartell 2000 23rd Street South - Sartell, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,256,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 11,781,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 935,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 0 |  |  |  |  |
Buildings & Improvements | 12,716,000 |  |  |  |  |
Total | 12,716,000 |  |  |  |  |
Accumulated Depreciation | (3,458,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Spring Creek American Falls- American Falls, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,328,000 | [1] |  |  |  |
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 | (180,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Spring Creek-Boise - Boise, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,957,000 | [1] |  |  |  |
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 | (214,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Spring Creek-Eagle - Eagle, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,141,000 | [1] |  |  |  |
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 | (176,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Spring Creek-Meridian - Meridian, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,538,000 | [1] |  |  |  |
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 | (310,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Spring Creek-Overland - Overland, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,339,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 687,000 |  |  |  |  |
Buildings & Improvements | 5,941,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 687,000 |  |  |  |  |
Buildings & Improvements | 5,941,000 |  |  |  |  |
Total | 6,628,000 |  |  |  |  |
Accumulated Depreciation | (286,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Spring Creek-Soda Springs - Soda Springs, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 838,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 66,000 |  |  |  |  |
Buildings & Improvements | 2,134,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 33,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 66,000 |  |  |  |  |
Buildings & Improvements | 2,167,000 |  |  |  |  |
Total | 2,233,000 |  |  |  |  |
Accumulated Depreciation | (101,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Spring Creek-Ustick - Meridian, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 | (165,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | St Michael Clinic - St Michael, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,902,000 | [1] |  |  |  |
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 | (384,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Trinity at Plaza 16 - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,984,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 568,000 |  |  |  |  |
Buildings & Improvements | 8,987,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 5,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 568,000 |  |  |  |  |
Buildings & Improvements | 8,992,000 |  |  |  |  |
Total | 9,560,000 |  |  |  |  |
Accumulated Depreciation | (361,000) |  |  |  |  |
Year of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Healthcare [Member] | Wells Clinic - Hibbing, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,463,000 | [1] |  |  |  |
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 | (565,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 38,622,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 20,121,000 |  |  |  |  |
Buildings & Improvements | 89,744,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 15,907,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 20,349,000 |  |  |  |  |
Buildings & Improvements | 105,423,000 |  |  |  |  |
Total | 125,772,000 |  |  |  |  |
Accumulated Depreciation | (23,688,000) |  |  |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Additions | 5,900,000 |  | 0 |  | 3,914,000 |
Commercial-Industrial [Member] | API Building - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 796,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 115,000 |  |  |  |  |
Buildings & Improvements | 1,605,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 115,000 |  |  |  |  |
Buildings & Improvements | 1,608,000 |  |  |  |  |
Total | 1,723,000 |  |  |  |  |
Accumulated Depreciation | (363,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Bloomington 2000 W 94th Street - Bloomington, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,133,000 | [5] |  |  |  |
Buildings & Improvements | 4,097,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 1,185,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,172,000 | [5] |  |  |  |
Buildings & Improvements | 5,243,000 | [5] |  |  |  |
Total | 7,415,000 | [5] |  |  |  |
Accumulated Depreciation | (972,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2006 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Industrial [Member] | Bodycote Industrial Building - Eden Prairie, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,046,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 198,000 |  |  |  |  |
Buildings & Improvements | 1,154,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 800,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 198,000 |  |  |  |  |
Buildings & Improvements | 1,954,000 |  |  |  |  |
Total | 2,152,000 |  |  |  |  |
Accumulated Depreciation | (858,000) |  |  |  |  |
Year of Construction or Acquisition | 1992 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Brooklyn Park 7401 Boone Avenue - Brooklyn Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 7,411,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,368,000 |  |  |  |  |
Buildings & Improvements | 11,643,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,121,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,368,000 |  |  |  |  |
Buildings & Improvements | 13,764,000 |  |  |  |  |
Total | 15,132,000 |  |  |  |  |
Accumulated Depreciation | (3,801,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Cedar Lake Business Center - St. Louis Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,276,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 895,000 |  |  |  |  |
Buildings & Improvements | 2,810,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 68,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 895,000 |  |  |  |  |
Buildings & Improvements | 2,878,000 |  |  |  |  |
Total | 3,773,000 |  |  |  |  |
Accumulated Depreciation | (444,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Clive 2075 NW 94th Street - Clive, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,175,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 408,000 |  |  |  |  |
Buildings & Improvements | 2,611,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 47,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 408,000 |  |  |  |  |
Buildings & Improvements | 2,658,000 |  |  |  |  |
Total | 3,066,000 |  |  |  |  |
Accumulated Depreciation | (246,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Dixon Avenue Industrial Park - Des Moines, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,439,000 |  |  |  |  |
Buildings & Improvements | 10,758,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,609,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,439,000 |  |  |  |  |
Buildings & Improvements | 12,367,000 |  |  |  |  |
Total | 13,806,000 |  |  |  |  |
Accumulated Depreciation | (3,501,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Eagan 2785 & 2795 Highway 55 - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,058,000 |  |  |  |  |
Buildings & Improvements | 2,570,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,058,000 |  |  |  |  |
Buildings & Improvements | 2,570,000 |  |  |  |  |
Total | 5,628,000 |  |  |  |  |
Accumulated Depreciation | (337,000) |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Fargo 1320 45th Street N - Fargo, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 395,000 |  |  |  |  |
Buildings & Improvements | 3,518,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 247,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 395,000 |  |  |  |  |
Buildings & Improvements | 3,765,000 |  |  |  |  |
Total | 4,160,000 |  |  |  |  |
Accumulated Depreciation | (273,000) |  |  |  |  |
Year of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Lexington Commerce Center - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,348,000 | [1] |  |  |  |
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 | (2,407,000) |  |  |  |  |
Year of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Lighthouse - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 836,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 90,000 |  |  |  |  |
Buildings & Improvements | 1,788,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 7,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 90,000 |  |  |  |  |
Buildings & Improvements | 1,795,000 |  |  |  |  |
Total | 1,885,000 |  |  |  |  |
Accumulated Depreciation | (408,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Metal Improvement Company - New Brighton, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 240,000 |  |  |  |  |
Buildings & Improvements | 2,189,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 78,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 240,000 |  |  |  |  |
Buildings & Improvements | 2,267,000 |  |  |  |  |
Total | 2,507,000 |  |  |  |  |
Accumulated Depreciation | (648,000) |  |  |  |  |
Year of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Minnetonka 13600 County Road 62 - Minnetonka, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,427,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 809,000 |  |  |  |  |
Buildings & Improvements | 434,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 2,459,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 809,000 |  |  |  |  |
Buildings & Improvements | 2,893,000 |  |  |  |  |
Total | 3,702,000 |  |  |  |  |
Accumulated Depreciation | (308,000) |  |  |  |  |
Year of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Minot IPS - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 416,000 |  |  |  |  |
Buildings & Improvements | 5,484,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 62,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 416,000 |  |  |  |  |
Buildings & Improvements | 5,546,000 |  |  |  |  |
Total | 5,962,000 |  |  |  |  |
Accumulated Depreciation | (59,000) |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Roseville 2929 Long Lake Road - Roseville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,966,000 |  |  |  |  |
Buildings & Improvements | 7,272,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,729,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,000,000 |  |  |  |  |
Buildings & Improvements | 8,967,000 |  |  |  |  |
Total | 10,967,000 |  |  |  |  |
Accumulated Depreciation | (1,506,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Stone Container - Fargo, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,426,000 | [1] |  |  |  |
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 | (2,608,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Stone Container - Roseville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 4,500,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 810,000 |  |  |  |  |
Buildings & Improvements | 7,440,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 254,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 882,000 |  |  |  |  |
Buildings & Improvements | 7,622,000 |  |  |  |  |
Total | 8,504,000 |  |  |  |  |
Accumulated Depreciation | (2,176,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Urbandale 3900 106th Street - Urbandale, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 10,702,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,680,000 |  |  |  |  |
Buildings & Improvements | 9,893,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,215,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,721,000 |  |  |  |  |
Buildings & Improvements | 11,067,000 |  |  |  |  |
Total | 14,788,000 |  |  |  |  |
Accumulated Depreciation | (1,732,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Winsted Industrial Building - Winsted, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 100,000 |  |  |  |  |
Buildings & Improvements | 901,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 53,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 100,000 |  |  |  |  |
Buildings & Improvements | 954,000 |  |  |  |  |
Total | 1,054,000 |  |  |  |  |
Accumulated Depreciation | (358,000) |  |  |  |  |
Year of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Industrial [Member] | Woodbury 1865 Woodlane - Woodbury, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,679,000 | [1] |  |  |  |
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 | (683,000) |  |  |  |  |
Year of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 35,220,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 19,099,000 |  |  |  |  |
Buildings & Improvements | 86,904,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 26,533,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 21,192,000 |  |  |  |  |
Buildings & Improvements | 111,344,000 |  |  |  |  |
Total | 132,536,000 |  |  |  |  |
Accumulated Depreciation | (27,218,000) |  |  |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Additions | 1,240,000 |  | 2,316,000 |  | 7,169,000 |
Commercial-Retail [Member] | 17 South Main - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 81,000 | [1] |  |  |  |
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 | (196,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Anoka Strip Center - Anoka, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 123,000 |  |  |  |  |
Buildings & Improvements | 602,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 25,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 134,000 |  |  |  |  |
Buildings & Improvements | 616,000 |  |  |  |  |
Total | 750,000 |  |  |  |  |
Accumulated Depreciation | (160,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Arrowhead First International Bank - Minot ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 75,000 |  |  |  |  |
Buildings & Improvements | 1,165,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 360,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 75,000 |  |  |  |  |
Buildings & Improvements | 1,525,000 |  |  |  |  |
Total | 1,600,000 |  |  |  |  |
Accumulated Depreciation | (3,000) |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Burnsville 1 Strip Center - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 329,000 | [1] |  |  |  |
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 | (256,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Burnsville 2 Strip Center - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 259,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 291,000 |  |  |  |  |
Buildings & Improvements | 469,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 214,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 294,000 |  |  |  |  |
Buildings & Improvements | 680,000 |  |  |  |  |
Total | 974,000 |  |  |  |  |
Accumulated Depreciation | (196,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Champlin South Pond - Champlin, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,473,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 842,000 |  |  |  |  |
Buildings & Improvements | 2,703,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 69,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 866,000 |  |  |  |  |
Buildings & Improvements | 2,748,000 |  |  |  |  |
Total | 3,614,000 |  |  |  |  |
Accumulated Depreciation | (650,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Chan West Village - Chanhassen, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 13,052,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 5,035,000 |  |  |  |  |
Buildings & Improvements | 14,665,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,987,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 5,606,000 |  |  |  |  |
Buildings & Improvements | 16,081,000 |  |  |  |  |
Total | 21,687,000 |  |  |  |  |
Accumulated Depreciation | (4,298,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Dakota West Plaza - Minot , ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 364,000 | [1] |  |  |  |
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 | (95,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Duluth 4615 Grand - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 677,000 | [1] |  |  |  |
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 | (407,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Duluth Denfeld Retail - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,235,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 276,000 |  |  |  |  |
Buildings & Improvements | 4,699,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 160,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 297,000 |  |  |  |  |
Buildings & Improvements | 4,838,000 |  |  |  |  |
Total | 5,135,000 |  |  |  |  |
Accumulated Depreciation | (1,114,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Eagan Community - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 702,000 |  |  |  |  |
Buildings & Improvements | 1,243,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 800,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 703,000 |  |  |  |  |
Buildings & Improvements | 2,042,000 |  |  |  |  |
Total | 2,745,000 |  |  |  |  |
Accumulated Depreciation | (498,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Fargo Express Community - Fargo, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 938,000 | [1] |  |  |  |
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 | (430,000) |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Fargo Express Community - Fargo, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Commercial-Retail [Member] | Fargo Express Community - Fargo, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Year of Construction or Acquisition | 2005 |  |  |  |  |
Commercial-Retail [Member] | Forest Lake Auto - Forest Lake, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 50,000 | [5] |  |  |  |
Buildings & Improvements | 446,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 13,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 50,000 | [5] |  |  |  |
Buildings & Improvements | 459,000 | [5] |  |  |  |
Total | 509,000 | [5] |  |  |  |
Accumulated Depreciation | (120,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2003 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Retail [Member] | Forest Lake Westlake Center - Forest Lake, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,446,000 |  |  |  |  |
Buildings & Improvements | 5,304,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 487,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,480,000 |  |  |  |  |
Buildings & Improvements | 5,757,000 |  |  |  |  |
Total | 8,237,000 |  |  |  |  |
Accumulated Depreciation | (1,485,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Grand Forks Carmike - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,541,000 | [1] |  |  |  |
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 | (1,092,000) |  |  |  |  |
Year of Construction or Acquisition | 1994 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Grand Forks Medpark Mall - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 681,000 |  |  |  |  |
Buildings & Improvements | 4,808,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 251,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 722,000 |  |  |  |  |
Buildings & Improvements | 5,018,000 |  |  |  |  |
Total | 5,740,000 |  |  |  |  |
Accumulated Depreciation | (1,683,000) |  |  |  |  |
Year of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Jamestown Buffalo Mall - Jamestown, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,331,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 566,000 |  |  |  |  |
Buildings & Improvements | 5,551,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,036,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,114,000 |  |  |  |  |
Buildings & Improvements | 8,039,000 |  |  |  |  |
Total | 9,153,000 |  |  |  |  |
Accumulated Depreciation | (1,486,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Jamestown Business Center - Jamestown, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 466,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 297,000 |  |  |  |  |
Buildings & Improvements | 1,023,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,332,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 333,000 |  |  |  |  |
Buildings & Improvements | 2,319,000 |  |  |  |  |
Total | 2,652,000 |  |  |  |  |
Accumulated Depreciation | (844,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Kalispell Retail Center - Kalispell, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,280,000 | [1] |  |  |  |
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 | (761,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Lakeville Strip Center - Lakeville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 932,000 | [1] |  |  |  |
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 | (613,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Minot 1400 31st Ave - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,026,000 | [5] |  |  |  |
Buildings & Improvements | 6,143,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 4,352,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,038,000 | [5] |  |  |  |
Buildings & Improvements | 10,483,000 | [5] |  |  |  |
Total | 11,521,000 | [5] |  |  |  |
Accumulated Depreciation | (1,054,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2010 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Retail [Member] | Minot Arrowhead - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 100,000 | [5] |  |  |  |
Buildings & Improvements | 3,007,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 5,272,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 116,000 | [5] |  |  |  |
Buildings & Improvements | 8,263,000 | [5] |  |  |  |
Total | 8,379,000 | [5] |  |  |  |
Accumulated Depreciation | (1,403,000) | [5] |  |  |  |
Year of Construction or Acquisition | 1973 | [5] |  |  |  |
Commercial-Retail [Member] | Minot Arrowhead - 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 | 15 years 6 months | [5] |  |  |  |
Commercial-Retail [Member] | Minot Arrowhead - 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 | [5] |  |  |  |
Commercial-Retail [Member] | Minot Plaza - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 795,000 | [1] |  |  |  |
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 | (296,000) |  |  |  |  |
Year of Construction or Acquisition | 1993 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Monticello C Store - Monticello, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 65,000 | [5] |  |  |  |
Buildings & Improvements | 770,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 37,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 97,000 | [5] |  |  |  |
Buildings & Improvements | 775,000 | [5] |  |  |  |
Total | 872,000 | [5] |  |  |  |
Accumulated Depreciation | (206,000) | [5] |  |  |  |
Year of Construction or Acquisition | 2003 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Retail [Member] | Omaha Barnes & Noble - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 2,418,000 | [1] |  |  |  |
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 | (1,356,000) |  |  |  |  |
Year of Construction or Acquisition | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Pine City C-Store - Pine City, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 | (96,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Pine City Evergreen Square - Pine City, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 154,000 |  |  |  |  |
Buildings & Improvements | 2,646,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 606,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 385,000 |  |  |  |  |
Buildings & Improvements | 3,021,000 |  |  |  |  |
Total | 3,406,000 |  |  |  |  |
Accumulated Depreciation | (890,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Rochester Maplewood Square - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1],[5] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,275,000 | [5] |  |  |  |
Buildings & Improvements | 8,610,000 | [5] |  |  |  |
Costs capitalized subsequent to acquisition | 1,966,000 | [5] |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,652,000 | [5] |  |  |  |
Buildings & Improvements | 10,199,000 | [5] |  |  |  |
Total | 13,851,000 | [5] |  |  |  |
Accumulated Depreciation | (3,229,000) | [5] |  |  |  |
Year of Construction or Acquisition | 1999 | [5] |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years | [5] |  |  |  |
Commercial-Retail [Member] | St. Cloud Westgate - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,008,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 918,000 |  |  |  |  |
Buildings & Improvements | 5,535,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,669,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 941,000 |  |  |  |  |
Buildings & Improvements | 7,181,000 |  |  |  |  |
Total | 8,122,000 |  |  |  |  |
Accumulated Depreciation | (1,481,000) |  |  |  |  |
Year of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Weston Retail - Weston, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 | (408,000) |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Commercial-Retail [Member] | Weston Walgreens - Weston, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 3,041,000 | [1] |  |  |  |
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 | (412,000) |  |  |  |  |
Year of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Subtotal [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 1,049,206,000 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 190,207,000 |  |  |  |  |
Buildings & Improvements | 1,577,356,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 265,407,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 207,499,000 |  |  |  |  |
Buildings & Improvements | 1,825,471,000 |  |  |  |  |
Total | 2,032,970,000 |  |  |  |  |
Accumulated Depreciation | (420,421,000) |  |  |  |  |
Unimproved Land [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 20,808,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 695,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 21,503,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 21,503,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Unimproved Land [Member] | Badger Hills Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 |  |  |  |  |
Unimproved Land [Member] | Bismarck 4916 - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 |  |  |  |  |
Unimproved Land [Member] | Bismarck 700 E Main - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 314,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 558,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 872,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 872,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
Unimproved Land [Member] | Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 447,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 447,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 447,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Unimproved Land [Member] | Eagan - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 |  |  |  |  |
Unimproved Land [Member] | Georgetown Square - Grand Chute, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 |  |  |  |  |
Unimproved Land [Member] | Grand Forks 2150 Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,600,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,600,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 1,600,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Unimproved Land [Member] | Grand Forks Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 |  |  |  |  |
Unimproved Land [Member] | Kalispell - Kalispell, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,400,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 23,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,423,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 1,423,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Unimproved Land [Member] | Minot Southgate Lot 4 Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,882,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,882,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 1,882,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Unimproved Land [Member] | Monticello - Monticello, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 |  |  |  |  |
Unimproved Land [Member] | Renaissance Heights - Williston, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,373,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,373,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 2,373,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Unimproved Land [Member] | River Falls - River Falls, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 176,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 179,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 179,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2003 |  |  |  |  |
Unimproved Land [Member] | Urbandale - Urbandale, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 |  |  |  |  |
Unimproved Land [Member] | Weston - Weston, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
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 |  |  |  |  |
Unimproved Land [Member] | Williston - Williston, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 823,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 823,000 |  |  |  |  |
Buildings & Improvements | 0 |  |  |  |  |
Total | 823,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Development in Progress [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 12,894,000 |  |  |  |  |
Buildings & Improvements | 27,023,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 6,594,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 12,907,000 |  |  |  |  |
Buildings & Improvements | 33,604,000 |  |  |  |  |
Total | 46,511,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Development in Progress [Member] | Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 1,136,000 |  |  |  |  |
Buildings & Improvements | 4,610,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 713,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 1,136,000 |  |  |  |  |
Buildings & Improvements | 5,323,000 |  |  |  |  |
Total | 6,459,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2012 |  |  |  |  |
Development in Progress [Member] | Arcata [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,088,000 |  |  |  |  |
Buildings & Improvements | 569,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 0 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,088,000 |  |  |  |  |
Buildings & Improvements | 569,000 |  |  |  |  |
Total | 2,657,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Development in Progress [Member] | Chateau II - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 61,000 |  |  |  |  |
Buildings & Improvements | 189,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 8,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 61,000 |  |  |  |  |
Buildings & Improvements | 197,000 |  |  |  |  |
Total | 258,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Development in Progress [Member] | Commons at Southgate - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,691,000 |  |  |  |  |
Buildings & Improvements | 2,180,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 594,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,691,000 |  |  |  |  |
Buildings & Improvements | 2,774,000 |  |  |  |  |
Total | 6,465,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Development in Progress [Member] | Landing at Southgate - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 2,262,000 |  |  |  |  |
Buildings & Improvements | 4,054,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,104,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 2,262,000 |  |  |  |  |
Buildings & Improvements | 5,158,000 |  |  |  |  |
Total | 7,420,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Development in Progress [Member] | Renaissance Heights I - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 3,080,000 |  |  |  |  |
Buildings & Improvements | 5,895,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 1,102,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 3,080,000 |  |  |  |  |
Buildings & Improvements | 6,997,000 |  |  |  |  |
Total | 10,077,000 |  |  |  |  |
Accumulated Depreciation | 0 |  |  |  |  |
Year of Construction or Acquisition | 2013 |  |  |  |  |
Development in Progress [Member] | River Ridge - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances | 0 | [1] |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land | 576,000 |  |  |  |  |
Buildings & Improvements | 9,526,000 |  |  |  |  |
Costs capitalized subsequent to acquisition | 3,073,000 |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land | 589,000 |  |  |  |  |
Buildings & Improvements | 12,586,000 |  |  |  |  |
Total | 13,175,000 |  |  |  |  |
Accumulated Depreciation | $ 0 |  |  |  |  |
Year of Construction or Acquisition | 2008 |  |  |  |  |
[1] | Amounts in this column are the mortgages payable balances as of April 30, 2013. These amounts do not include amounts owing under the Company’s multi-bank line of credit or under the Company’s construction loans.
[2] | The net basis of the Company’s real estate investments for Federal Income Tax purposes was approximately $1.5 billion, $1.4 billion and $1.2 billion at April 30, 2013, 2012 and 2011, respectively.
[3] | Consists of miscellaneous disposed assets and assets moved to Development in Progress.
[4] | Consists of miscellaneous disposed assets.
[5] | As of April 30, 2013, this property was included in the collateral pool securing the Company’s $60.0 million multi-bank line of credit. The Company may add and remove eligible properties from the collateral pool if certain minimum collateral requirements are satisfied. Advances under the facility may not exceed 60% of the value of properties provided as security.

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- Definition Gross amount of real estate as of the balance sheet date. + References Reference 1: 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 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 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=6882300&loc=d3e5864-122674 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 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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