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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | $ 665,338 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 131,815 |  |
Buildings & Improvements |  |  |  | 1,307,790 |  |
Costs capitalized subsequent to acquisition |  |  |  | 256,331 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 154,820 |  |
Buildings & Improvements |  |  |  | 1,541,116 |  |
Total | $ 1,695,936 |  |  | 1,695,936 |  |
Accumulated Depreciation | (312,889) | $ (279,417) | $ (273,934) | (340,417) | $ (312,889) | $ (279,417)
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Write down of asset and accumulated depreciation on impaired assets | (7,144) |  | (881) |  |  |
Balance at close of year | 1,695,936 |  |  |  |  |
Reconciliations of accumulated depreciation/amortization [Abstract] |  |  |  |  |  |
Balance at beginning of year | 312,889 | 279,417 | 273,934 |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Provisions for depreciation | 52,786 | 47,064 | 40,078 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Accumulated depreciation on real estate sold | (14,687) | (9,957) | (29,463) |  |  |
Write down of asset and accumulated depreciation on impaired assets | (7,144) |  | (881) |  |  |
Other | (3,427) | (3,635) | (4,251) |  |  |
Balance at close of year | 340,417 | 312,889 | 279,417 |  |  |
Total real estate investments |  |  |  | 1,355,519 | 1,441,202 |
Net basis of real estate investments for federal income tax purposes |  |  |  | 1,400 | 1,600 | 1,700
Discontinued Operations [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 21,802 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,959 |  |
Buildings & Improvements |  |  |  | 34,572 |  |
Costs capitalized subsequent to acquisition |  |  |  | 14,528 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,915 |  |
Buildings & Improvements |  |  |  | 48,144 |  |
Total | 52,059 |  |  | 52,059 |  |
Accumulated Depreciation | (16,744) |  |  | (16,744) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 52,059 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 16,744 |  |  |  |  |
Discontinued Operations [Member] | 1st Avenue Building - Minot, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 30 |  |
Buildings & Improvements |  |  |  | 337 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 30 |  |
Buildings & Improvements |  |  |  | 337 |  |
Total | 367 |  |  | 367 |  |
Accumulated Depreciation | $ (54) |  |  | (54) |  |
Date of Construction or Acquisition | 1981 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 367 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 54 |  |  |  |  |
Discontinued Operations [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 |  |  |  |  |
Discontinued Operations [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 |  |  |  |  |
Discontinued Operations [Member] | 4th Street 4 Plex - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 90 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 15 |  |
Buildings & Improvements |  |  |  | 74 |  |
Costs capitalized subsequent to acquisition |  |  |  | 41 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 26 |  |
Buildings & Improvements |  |  |  | 104 |  |
Total | $ 130 |  |  | 130 |  |
Accumulated Depreciation | $ (26) |  |  | (26) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 130 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 26 |  |  |  |  |
Discontinued Operations [Member] | 11th Street 3 Plex - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 77 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 11 |  |
Buildings & Improvements |  |  |  | 53 |  |
Costs capitalized subsequent to acquisition |  |  |  | 26 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 20 |  |
Buildings & Improvements |  |  |  | 70 |  |
Total | 90 |  |  | 90 |  |
Accumulated Depreciation | $ (16) |  |  | (16) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 90 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 16 |  |  |  |  |
Discontinued Operations [Member] | 17 South Main - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 69 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 15 |  |
Buildings & Improvements |  |  |  | 75 |  |
Costs capitalized subsequent to acquisition |  |  |  | 197 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 17 |  |
Buildings & Improvements |  |  |  | 270 |  |
Total | 287 |  |  | 287 |  |
Accumulated Depreciation | $ (206) |  |  | (206) |  |
Date of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 287 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 206 |  |  |  |  |
Discontinued Operations [Member] | Apartments on Main - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 590 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 158 |  |
Buildings & Improvements |  |  |  | 1,123 |  |
Costs capitalized subsequent to acquisition |  |  |  | 71 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 195 |  |
Buildings & Improvements |  |  |  | 1,157 |  |
Total | 1,352 |  |  | 1,352 |  |
Accumulated Depreciation | $ (292) |  |  | (292) |  |
Date of Construction or Acquisition | 1987 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,352 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 292 |  |  |  |  |
Discontinued Operations [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 |  |  |  |  |
Discontinued Operations [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 |  |  |  |  |
Discontinued Operations [Member] | Brooklyn Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 573 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 145 |  |
Buildings & Improvements |  |  |  | 1,450 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,051 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 235 |  |
Buildings & Improvements |  |  |  | 2,411 |  |
Total | $ 2,646 |  |  | 2,646 |  |
Accumulated Depreciation | $ (1,035) |  |  | (1,035) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,646 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,035 |  |  |  |  |
Discontinued Operations [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 |  |  |  |  |
Discontinued Operations [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 |  |  |  |  |
Discontinued Operations [Member] | Colton Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 323 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 80 |  |
Buildings & Improvements |  |  |  | 672 |  |
Costs capitalized subsequent to acquisition |  |  |  | 470 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 123 |  |
Buildings & Improvements |  |  |  | 1,099 |  |
Total | $ 1,222 |  |  | 1,222 |  |
Accumulated Depreciation | $ (825) |  |  | (825) |  |
Date of Construction or Acquisition | 1984 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,222 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 825 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Hermantown I, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 16,233 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 288 |  |
Buildings & Improvements |  |  |  | 9,871 |  |
Costs capitalized subsequent to acquisition |  |  |  | 10,094 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 288 |  |
Buildings & Improvements |  |  |  | 19,965 |  |
Total | 20,253 |  |  | 20,253 |  |
Accumulated Depreciation | $ (7,931) |  |  | (7,931) |  |
Date of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 20,253 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,931 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Hermantown II, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 719 |  |
Buildings & Improvements |  |  |  | 10,517 |  |
Costs capitalized subsequent to acquisition |  |  |  | 942 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 719 |  |
Buildings & Improvements |  |  |  | 11,459 |  |
Total | 12,178 |  |  | 12,178 |  |
Accumulated Depreciation | $ (3,168) |  |  | (3,168) |  |
Date of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 12,178 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,168 |  |  |  |  |
Discontinued Operations [Member] | Fairmont - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 305 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 28 |  |
Buildings & Improvements |  |  |  | 337 |  |
Costs capitalized subsequent to acquisition |  |  |  | 132 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 56 |  |
Buildings & Improvements |  |  |  | 441 |  |
Total | 497 |  |  | 497 |  |
Accumulated Depreciation | $ (101) |  |  | (101) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 497 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 101 |  |  |  |  |
Discontinued Operations [Member] | First Avenue - Minot ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 3,045 |  |
Costs capitalized subsequent to acquisition |  |  |  | 24 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 3,069 |  |
Total | 3,069 |  |  | 3,069 |  |
Accumulated Depreciation | $ (273) |  |  | (273) |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,069 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 273 |  |  |  |  |
Discontinued Operations [Member] | Minot Southgate Wells Fargo Bank - Minot, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 992 |  |
Buildings & Improvements |  |  |  | 2,237 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 992 |  |
Buildings & Improvements |  |  |  | 2,237 |  |
Total | 3,229 |  |  | 3,229 |  |
Accumulated Depreciation | $ (139) |  |  | (139) |  |
Date of Construction or Acquisition | 2014 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,229 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 139 |  |  |  |  |
Discontinued Operations [Member] | Pines - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 92 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 35 |  |
Buildings & Improvements |  |  |  | 215 |  |
Costs capitalized subsequent to acquisition |  |  |  | 270 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 49 |  |
Buildings & Improvements |  |  |  | 471 |  |
Total | 520 |  |  | 520 |  |
Accumulated Depreciation | $ (151) |  |  | (151) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 520 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 151 |  |  |  |  |
Discontinued Operations [Member] | Southview - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 978 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 185 |  |
Buildings & Improvements |  |  |  | 469 |  |
Costs capitalized subsequent to acquisition |  |  |  | 525 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 251 |  |
Buildings & Improvements |  |  |  | 928 |  |
Total | 1,179 |  |  | 1,179 |  |
Accumulated Depreciation | $ (407) |  |  | (407) |  |
Date of Construction or Acquisition | 1994 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,179 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 407 |  |  |  |  |
Discontinued Operations [Member] | Summit Park - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 795 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 161 |  |
Buildings & Improvements |  |  |  | 1,898 |  |
Costs capitalized subsequent to acquisition |  |  |  | (126) |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 795 |  |
Buildings & Improvements |  |  |  | 1,138 |  |
Total | 1,933 |  |  | 1,933 |  |
Accumulated Depreciation | $ (1,382) |  |  | (1,382) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,933 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,382 |  |  |  |  |
Discontinued Operations [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 |  |  |  |  |
Discontinued Operations [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 |  |  |  |  |
Discontinued Operations [Member] | Temple - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 69 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 226 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 226 |  |
Total | $ 226 |  |  | 226 |  |
Accumulated Depreciation | $ (57) |  |  | (57) |  |
Date of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 226 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 57 |  |  |  |  |
Discontinued Operations [Member] | Terrace Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 133 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 29 |  |
Buildings & Improvements |  |  |  | 312 |  |
Costs capitalized subsequent to acquisition |  |  |  | 206 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 40 |  |
Buildings & Improvements |  |  |  | 507 |  |
Total | 547 |  |  | 547 |  |
Accumulated Depreciation | $ (187) |  |  | (187) |  |
Date of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 547 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 187 |  |  |  |  |
Discontinued Operations [Member] | Westridge - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,475 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 68 |  |
Buildings & Improvements |  |  |  | 1,887 |  |
Costs capitalized subsequent to acquisition |  |  |  | 379 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 79 |  |
Buildings & Improvements |  |  |  | 2,255 |  |
Total | 2,334 |  |  | 2,334 |  |
Accumulated Depreciation | $ (494) |  |  | (494) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,334 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 494 |  |  |  |  |
Wholly Owned Properties [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Total | 1,681,471 | 1,335,687 | 1,241,195 | 1,677,481 | 1,681,471 | 1,335,687
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at beginning of year | 1,681,471 | 1,335,687 | 1,241,195 |  |  |
Transfers | (24,156) | (32,438) | (97,824) |  |  |
Improvements and Other | 42,291 | 34,619 | 21,006 |  |  |
Total Additions | 1,785,327 | 1,718,991 | 1,457,538 |  |  |
Cost of real estate sold | (21,718) | (1,305) | (17,904) |  |  |
Impairment charge | (51,401) |  | (1,566) |  |  |
Write down of asset and accumulated depreciation on impaired assets | (7,144) |  | (881) |  |  |
Other | (3,427) | (3,777) | (3,676) |  |  |
Balance at close of year | 1,677,481 | 1,681,471 | 1,335,687 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Write down of asset and accumulated depreciation on impaired assets | (7,144) |  | (881) |  |  |
Development in Progress [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Total | 51,681 | 153,994 | 104,609 |  | 51,681 | 153,994
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at beginning of year | 51,681 | 153,994 | 104,609 |  |  |
Acquisitions |  |  | 12,647 |  |  |
Transfers |  | 1,734 | 7,015 |  |  |
Improvements and Other | 7,893 | 96,753 | 189,306 |  |  |
Development placed in service | (59,574) | (200,800) | (159,578) |  |  |
Other |  |  | (5) |  |  |
Balance at close of year |  | 51,681 | 153,994 |  |  |
Unimproved Land [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 16,671 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,784 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 18,455 |  |
Total | 20,939 | 25,827 | 22,864 | 18,455 | 20,939 | 25,827
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at beginning of year | 20,939 | 25,827 | 22,864 |  |  |
Acquisitions |  |  | 10,487 |  |  |
Transfers |  | (1,632) | (79) |  |  |
Improvements and Other | 1,024 | 205 | 1,533 |  |  |
Cost of real estate sold |  | (442) | (670) |  |  |
Impairment charge | (3,508) | (1,285) | (1,293) |  |  |
Development placed in service |  | (1,734) | (7,015) |  |  |
Balance at close of year | 18,455 | 20,939 | 25,827 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Total real estate investments |  |  |  | 1,355,519 | $ 1,441,202 | $ 1,236,091
Unimproved Land [Member] | Renaissance Heights - Williston, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,178 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,178 |  |
Total | $ 1,178 |  |  | 1,178 |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,178 |  |  |  |  |
Unimproved Land [Member] | Badger Hills - Rochester, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,050 |  |
Costs capitalized subsequent to acquisition |  |  |  | 339 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,389 |  |
Total | $ 1,389 |  |  | 1,389 |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,389 |  |  |  |  |
Unimproved Land [Member] | Bismarck 4916 - Bismarck, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,250 |  |
Costs capitalized subsequent to acquisition |  |  |  | 45 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,295 |  |
Total | $ 3,295 |  |  | 3,295 |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,295 |  |  |  |  |
Unimproved Land [Member] | Bismarck 700 E Main - Bismarck, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 314 |  |
Costs capitalized subsequent to acquisition |  |  |  | 571 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 885 |  |
Total | $ 885 |  |  | 885 |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 885 |  |  |  |  |
Unimproved Land [Member] | Creekside Crossing - Bismarck, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 4,286 |  |
Costs capitalized subsequent to acquisition |  |  |  | 719 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 5,005 |  |
Total | $ 5,005 |  |  | 5,005 |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,005 |  |  |  |  |
Unimproved Land [Member] | Grand Forks Grand Forks, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 4,278 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 4,280 |  |
Total | $ 4,280 |  |  | 4,280 |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,280 |  |  |  |  |
Unimproved Land [Member] | Isanti Unimproved - Isanti, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 58 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 58 |  |
Total | $ 58 |  |  | 58 |  |
Date of Construction or Acquisition | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 58 |  |  |  |  |
Unimproved Land [Member] | Minot 1525 24th Ave SW - Minot, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 506 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 506 |  |
Total | $ 506 |  |  | 506 |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 506 |  |  |  |  |
Unimproved Land [Member] | Rapid City Unimproved- Rapid City, SD [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,376 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,376 |  |
Total | $ 1,376 |  |  | 1,376 |  |
Date of Construction or Acquisition | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,376 |  |  |  |  |
Unimproved Land [Member] | Urbandale - Urbandale, IA [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 5 |  |
Costs capitalized subsequent to acquisition |  |  |  | 108 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 113 |  |
Total | $ 113 |  |  | 113 |  |
Date of Construction or Acquisition | 2009 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 113 |  |  |  |  |
Unimproved Land [Member] | Weston - Weston, WI [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 370 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 370 |  |
Total | $ 370 |  |  | 370 |  |
Date of Construction or Acquisition | 2006 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 370 |  |  |  |  |
Multi-Family Residential [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 548,401 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 82,121 |  |
Buildings & Improvements |  |  |  | 1,004,096 |  |
Costs capitalized subsequent to acquisition |  |  |  | 174,324 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 101,227 |  |
Buildings & Improvements |  |  |  | 1,159,314 |  |
Total | 1,260,541 |  |  | 1,260,541 |  |
Accumulated Depreciation | (232,592) |  |  | (232,592) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 1,260,541 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 232,592 |  |  |  |  |
Multi-Family Residential [Member] | 71 France - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 56,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 4,721 |  |
Buildings & Improvements |  |  |  | 67,641 |  |
Costs capitalized subsequent to acquisition |  |  |  | 119 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 4,721 |  |
Buildings & Improvements |  |  |  | 67,760 |  |
Total | 72,481 |  |  | 72,481 |  |
Accumulated Depreciation | $ (2,685) |  |  | (2,685) |  |
Date of Construction or Acquisition | 2016 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 72,481 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,685 |  |  |  |  |
Multi-Family Residential [Member] | Alps Park - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,728 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 287 |  |
Buildings & Improvements |  |  |  | 5,551 |  |
Costs capitalized subsequent to acquisition |  |  |  | 313 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 333 |  |
Buildings & Improvements |  |  |  | 5,818 |  |
Total | 6,151 |  |  | 6,151 |  |
Accumulated Depreciation | $ (640) |  |  | (640) |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,151 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 640 |  |  |  |  |
Multi-Family Residential [Member] | Arbors - S Sioux City, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,660 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 350 |  |
Buildings & Improvements |  |  |  | 6,625 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,198 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,021 |  |
Buildings & Improvements |  |  |  | 8,152 |  |
Total | 9,173 |  |  | 9,173 |  |
Accumulated Depreciation | $ (2,501) |  |  | (2,501) |  |
Date of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 9,173 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,501 |  |  |  |  |
Multi-Family Residential [Member] | Arcata - Golden Valley, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,088 |  |
Buildings & Improvements |  |  |  | 31,036 |  |
Costs capitalized subsequent to acquisition |  |  |  | 94 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,089 |  |
Buildings & Improvements |  |  |  | 31,129 |  |
Total | 33,218 |  |  | 33,218 |  |
Accumulated Depreciation | $ (2,524) |  |  | (2,524) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 33,218 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,524 |  |  |  |  |
Multi-Family Residential [Member] | Ashland - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,306 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 741 |  |
Buildings & Improvements |  |  |  | 7,569 |  |
Costs capitalized subsequent to acquisition |  |  |  | 244 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 791 |  |
Buildings & Improvements |  |  |  | 7,763 |  |
Total | 8,554 |  |  | 8,554 |  |
Accumulated Depreciation | $ (1,130) |  |  | (1,130) |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 8,554 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,130 |  |  |  |  |
Multi-Family Residential [Member] | Avalon Cove - Rochester, MN |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,616 |  |
Buildings & Improvements |  |  |  | 34,074 |  |
Costs capitalized subsequent to acquisition |  |  |  | 178 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,618 |  |
Buildings & Improvements |  |  |  | 34,250 |  |
Total | 35,868 |  |  | 35,868 |  |
Accumulated Depreciation | $ (1,057) |  |  | (1,057) |  |
Date of Construction or Acquisition | 2016 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 35,868 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,057 |  |  |  |  |
Multi-Family Residential [Member] | Boulder Court - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,067 |  |
Buildings & Improvements |  |  |  | 5,498 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,005 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,393 |  |
Buildings & Improvements |  |  |  | 8,177 |  |
Total | 9,570 |  |  | 9,570 |  |
Accumulated Depreciation | $ (2,882) |  |  | (2,882) |  |
Date of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 9,570 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,882 |  |  |  |  |
Multi-Family Residential [Member] | Brookfield Village - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,025 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 509 |  |
Buildings & Improvements |  |  |  | 6,698 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,773 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 828 |  |
Buildings & Improvements |  |  |  | 8,152 |  |
Total | 8,980 |  |  | 8,980 |  |
Accumulated Depreciation | $ (2,743) |  |  | (2,743) |  |
Date of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 8,980 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,743 |  |  |  |  |
Multi-Family Residential [Member] | Canyon Lake - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,735 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 305 |  |
Buildings & Improvements |  |  |  | 3,958 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,929 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 397 |  |
Buildings & Improvements |  |  |  | 5,795 |  |
Total | 6,192 |  |  | 6,192 |  |
Accumulated Depreciation | $ (2,159) |  |  | (2,159) |  |
Date of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,192 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,159 |  |  |  |  |
Multi-Family Residential [Member] | Cardinal Point - Grand Forks, ND |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,600 |  |
Buildings & Improvements |  |  |  | 49,606 |  |
Costs capitalized subsequent to acquisition |  |  |  | 995 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,604 |  |
Buildings & Improvements |  |  |  | 50,597 |  |
Total | 52,201 |  |  | 52,201 |  |
Accumulated Depreciation | $ (2,235) |  |  | (2,235) |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 52,201 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,235 |  |  |  |  |
Multi-Family Residential [Member] | Cascade Shores - Rochester, MN |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 11,400 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,585 |  |
Buildings & Improvements |  |  |  | 16,710 |  |
Costs capitalized subsequent to acquisition |  |  |  | 47 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,586 |  |
Buildings & Improvements |  |  |  | 16,756 |  |
Total | 18,342 |  |  | 18,342 |  |
Accumulated Depreciation | $ (540) |  |  | (540) |  |
Date of Construction or Acquisition | 2016 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 18,342 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 540 |  |  |  |  |
Multi-Family Residential [Member] | Castlerock - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 6,347 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 736 |  |
Buildings & Improvements |  |  |  | 4,864 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,370 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,022 |  |
Buildings & Improvements |  |  |  | 6,948 |  |
Total | 7,970 |  |  | 7,970 |  |
Accumulated Depreciation | $ (3,199) |  |  | (3,199) |  |
Date of Construction or Acquisition | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 7,970 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,199 |  |  |  |  |
Multi-Family Residential [Member] | Chateau I & II - Minot, ND |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 301 |  |
Buildings & Improvements |  |  |  | 20,058 |  |
Costs capitalized subsequent to acquisition |  |  |  | 833 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 317 |  |
Buildings & Improvements |  |  |  | 20,875 |  |
Total | 21,192 |  |  | 21,192 |  |
Accumulated Depreciation | $ (2,081) |  |  | (2,081) |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 21,192 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,081 |  |  |  |  |
Multi-Family Residential [Member] | Cimarron Hills - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,562 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 706 |  |
Buildings & Improvements |  |  |  | 9,588 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,588 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,417 |  |
Buildings & Improvements |  |  |  | 13,465 |  |
Total | 14,882 |  |  | 14,882 |  |
Accumulated Depreciation | $ (5,492) |  |  | (5,492) |  |
Date of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 14,882 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,492 |  |  |  |  |
Multi-Family Residential [Member] | Colonial Villa - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,401 |  |
Buildings & Improvements |  |  |  | 11,515 |  |
Costs capitalized subsequent to acquisition |  |  |  | 9,039 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,880 |  |
Buildings & Improvements |  |  |  | 20,075 |  |
Total | 22,955 |  |  | 22,955 |  |
Accumulated Depreciation | $ (6,746) |  |  | (6,746) |  |
Date of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 22,955 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,746 |  |  |  |  |
Multi-Family Residential [Member] | Colony - Lincoln, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 12,748 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,515 |  |
Buildings & Improvements |  |  |  | 15,730 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,220 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,652 |  |
Buildings & Improvements |  |  |  | 16,813 |  |
Total | 18,465 |  |  | 18,465 |  |
Accumulated Depreciation | $ (2,361) |  |  | (2,361) |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 18,465 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,361 |  |  |  |  |
Multi-Family Residential [Member] | Commons at Southgate - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 26,751 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 5,945 |  |
Buildings & Improvements |  |  |  | 47,512 |  |
Costs capitalized subsequent to acquisition |  |  |  | 825 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 6,194 |  |
Buildings & Improvements |  |  |  | 48,088 |  |
Total | 54,282 |  |  | 54,282 |  |
Accumulated Depreciation | $ (4,490) |  |  | (4,490) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 54,282 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,490 |  |  |  |  |
Multi-Family Residential [Member] | Cottage West Twin Homes - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,457 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 968 |  |
Buildings & Improvements |  |  |  | 3,762 |  |
Costs capitalized subsequent to acquisition |  |  |  | 555 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,056 |  |
Buildings & Improvements |  |  |  | 4,229 |  |
Total | 5,285 |  |  | 5,285 |  |
Accumulated Depreciation | $ (619) |  |  | (619) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,285 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 619 |  |  |  |  |
Multi-Family Residential [Member] | Cottonwood - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 15,111 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,056 |  |
Buildings & Improvements |  |  |  | 17,372 |  |
Costs capitalized subsequent to acquisition |  |  |  | 5,231 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,504 |  |
Buildings & Improvements |  |  |  | 22,155 |  |
Total | 23,659 |  |  | 23,659 |  |
Accumulated Depreciation | $ (8,130) |  |  | (8,130) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 23,659 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 8,130 |  |  |  |  |
Multi-Family Residential [Member] | Country Meadows - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 6,303 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 491 |  |
Buildings & Improvements |  |  |  | 7,809 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,726 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 567 |  |
Buildings & Improvements |  |  |  | 9,459 |  |
Total | 10,026 |  |  | 10,026 |  |
Accumulated Depreciation | $ (4,378) |  |  | (4,378) |  |
Date of Construction or Acquisition | 1995 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 10,026 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,378 |  |  |  |  |
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 |  |  |  | 3,670 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 235 |  |
Buildings & Improvements |  |  |  | 4,290 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,069 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 557 |  |
Buildings & Improvements |  |  |  | 6,037 |  |
Total | $ 6,594 |  |  | 6,594 |  |
Accumulated Depreciation | $ (3,266) |  |  | (3,266) |  |
Date of Construction or Acquisition | 1994 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,594 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,266 |  |  |  |  |
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 |  |  |  | 2,443 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 261 |  |
Buildings & Improvements |  |  |  | 3,289 |  |
Costs capitalized subsequent to acquisition |  |  |  | 577 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 269 |  |
Buildings & Improvements |  |  |  | 3,858 |  |
Total | $ 4,127 |  |  | 4,127 |  |
Accumulated Depreciation | $ (699) |  |  | (699) |  |
Date of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,127 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 699 |  |  |  |  |
Multi-Family Residential [Member] | Crown Colony - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,780 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 620 |  |
Buildings & Improvements |  |  |  | 9,956 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,574 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,042 |  |
Buildings & Improvements |  |  |  | 13,108 |  |
Total | 14,150 |  |  | 14,150 |  |
Accumulated Depreciation | $ (5,248) |  |  | (5,248) |  |
Date of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 14,150 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,248 |  |  |  |  |
Multi-Family Residential [Member] | Crystal Bay - Rochester, MN |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 433 |  |
Buildings & Improvements |  |  |  | 11,425 |  |
Costs capitalized subsequent to acquisition |  |  |  | 68 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 436 |  |
Buildings & Improvements |  |  |  | 11,490 |  |
Total | 11,926 |  |  | 11,926 |  |
Accumulated Depreciation | $ (347) |  |  | (347) |  |
Date of Construction or Acquisition | 2016 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 11,926 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 347 |  |  |  |  |
Multi-Family Residential [Member] | Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 12,666 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,583 |  |
Buildings & Improvements |  |  |  | 18,879 |  |
Costs capitalized subsequent to acquisition |  |  |  | 194 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,599 |  |
Buildings & Improvements |  |  |  | 19,057 |  |
Total | 20,656 |  |  | 20,656 |  |
Accumulated Depreciation | $ (1,909) |  |  | (1,909) |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 20,656 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,909 |  |  |  |  |
Multi-Family Residential [Member] | Dakota Commons - Williston, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 823 |  |
Buildings & Improvements |  |  |  | 3,210 |  |
Costs capitalized subsequent to acquisition |  |  |  | 17 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 823 |  |
Buildings & Improvements |  |  |  | 3,227 |  |
Total | 4,050 |  |  | 4,050 |  |
Accumulated Depreciation | $ (58) |  |  | (58) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,050 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 58 |  |  |  |  |
Multi-Family Residential [Member] | Deer Ridge - Jamestown, ND |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 11,490 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 711 |  |
Buildings & Improvements |  |  |  | 24,129 |  |
Costs capitalized subsequent to acquisition |  |  |  | 123 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 723 |  |
Buildings & Improvements |  |  |  | 24,240 |  |
Total | 24,963 |  |  | 24,963 |  |
Accumulated Depreciation | $ (1,312) |  |  | (1,312) |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 24,963 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,312 |  |  |  |  |
Multi-Family Residential [Member] | Evergreen - Isanti, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,885 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,071 |  |
Buildings & Improvements |  |  |  | 5,524 |  |
Costs capitalized subsequent to acquisition |  |  |  | 339 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,083 |  |
Buildings & Improvements |  |  |  | 5,851 |  |
Total | 6,934 |  |  | 6,934 |  |
Accumulated Depreciation | $ (1,084) |  |  | (1,084) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,934 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,084 |  |  |  |  |
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,275 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 810 |  |
Buildings & Improvements |  |  |  | 5,579 |  |
Costs capitalized subsequent to acquisition |  |  |  | 8,068 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,450 |  |
Buildings & Improvements |  |  |  | 13,007 |  |
Total | 14,457 |  |  | 14,457 |  |
Accumulated Depreciation | $ (6,232) |  |  | (6,232) |  |
Date of Construction or Acquisition | 1993 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 14,457 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,232 |  |  |  |  |
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] | French Creek - Rochester, MN |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 201 |  |
Buildings & Improvements |  |  |  | 4,735 |  |
Costs capitalized subsequent to acquisition |  |  |  | 19 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 207 |  |
Buildings & Improvements |  |  |  | 4,748 |  |
Total | $ 4,955 |  |  | 4,955 |  |
Accumulated Depreciation | $ (139) |  |  | (139) |  |
Date of Construction or Acquisition | 2016 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,955 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 139 |  |  |  |  |
Multi-Family Residential [Member] | Gables Townhomes - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,399 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 349 |  |
Buildings & Improvements |  |  |  | 1,921 |  |
Costs capitalized subsequent to acquisition |  |  |  | 214 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 383 |  |
Buildings & Improvements |  |  |  | 2,101 |  |
Total | 2,484 |  |  | 2,484 |  |
Accumulated Depreciation | $ (306) |  |  | (306) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,484 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 306 |  |  |  |  |
Multi-Family Residential [Member] | Gardens - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 518 |  |
Buildings & Improvements |  |  |  | 8,702 |  |
Costs capitalized subsequent to acquisition |  |  |  | 96 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 528 |  |
Buildings & Improvements |  |  |  | 8,788 |  |
Total | 9,316 |  |  | 9,316 |  |
Accumulated Depreciation | $ (403) |  |  | (403) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 9,316 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 403 |  |  |  |  |
Multi-Family Residential [Member] | Grand Gateway - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 814 |  |
Buildings & Improvements |  |  |  | 7,086 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,823 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 936 |  |
Buildings & Improvements |  |  |  | 8,787 |  |
Total | 9,723 |  |  | 9,723 |  |
Accumulated Depreciation | $ (1,362) |  |  | (1,362) |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 9,723 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,362 |  |  |  |  |
Multi-Family Residential [Member] | GrandeVille at Cascade Lake - Rochester, MN |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 36,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 5,003 |  |
Buildings & Improvements |  |  |  | 50,363 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,305 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 5,044 |  |
Buildings & Improvements |  |  |  | 51,627 |  |
Total | 56,671 |  |  | 56,671 |  |
Accumulated Depreciation | $ (2,181) |  |  | (2,181) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 56,671 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,181 |  |  |  |  |
Multi-Family Residential [Member] | Greenfield - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,451 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 578 |  |
Buildings & Improvements |  |  |  | 4,122 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,206 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 843 |  |
Buildings & Improvements |  |  |  | 5,063 |  |
Total | 5,906 |  |  | 5,906 |  |
Accumulated Depreciation | $ (1,274) |  |  | (1,274) |  |
Date of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,906 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,274 |  |  |  |  |
Multi-Family Residential [Member] | Heritage Manor - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,558 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 403 |  |
Buildings & Improvements |  |  |  | 6,968 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,093 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 605 |  |
Buildings & Improvements |  |  |  | 9,859 |  |
Total | 10,464 |  |  | 10,464 |  |
Accumulated Depreciation | $ (4,345) |  |  | (4,345) |  |
Date of Construction or Acquisition | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 10,464 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,345 |  |  |  |  |
Multi-Family Residential [Member] | Homestead Garden - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,024 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 655 |  |
Buildings & Improvements |  |  |  | 14,139 |  |
Costs capitalized subsequent to acquisition |  |  |  | 448 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 713 |  |
Buildings & Improvements |  |  |  | 14,529 |  |
Total | 15,242 |  |  | 15,242 |  |
Accumulated Depreciation | $ (1,158) |  |  | (1,158) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 15,242 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,158 |  |  |  |  |
Multi-Family Residential [Member] | Indian Hills - Sioux City, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 294 |  |
Buildings & Improvements |  |  |  | 2,921 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,281 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 444 |  |
Buildings & Improvements |  |  |  | 7,052 |  |
Total | 7,496 |  |  | 7,496 |  |
Accumulated Depreciation | $ (1,803) |  |  | (1,803) |  |
Date of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 7,496 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,803 |  |  |  |  |
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,145 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 449 |  |
Buildings & Improvements |  |  |  | 2,725 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,825 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 598 |  |
Buildings & Improvements |  |  |  | 4,401 |  |
Total | 4,999 |  |  | 4,999 |  |
Accumulated Depreciation | $ (2,039) |  |  | (2,039) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,999 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,039 |  |  |  |  |
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 |  |  |  | 12,593 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,215 |  |
Buildings & Improvements |  |  |  | 15,837 |  |
Costs capitalized subsequent to acquisition |  |  |  | 859 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,302 |  |
Buildings & Improvements |  |  |  | 16,609 |  |
Total | $ 17,911 |  |  | 17,911 |  |
Accumulated Depreciation | $ (2,294) |  |  | (2,294) |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 17,911 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,294 |  |  |  |  |
Multi-Family Residential [Member] | Landmark - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 184 |  |
Buildings & Improvements |  |  |  | 1,514 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,188 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 355 |  |
Buildings & Improvements |  |  |  | 2,531 |  |
Total | 2,886 |  |  | 2,886 |  |
Accumulated Depreciation | $ (1,217) |  |  | (1,217) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,886 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,217 |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 14,751 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,362 |  |
Buildings & Improvements |  |  |  | 21,727 |  |
Costs capitalized subsequent to acquisition |  |  |  | 10,275 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,252 |  |
Buildings & Improvements |  |  |  | 31,112 |  |
Total | 33,364 |  |  | 33,364 |  |
Accumulated Depreciation | (11,970) |  |  | (11,970) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 33,364 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 11,970 |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Date of Construction or Acquisition | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Date of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Legacy Heights - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,207 |  |
Buildings & Improvements |  |  |  | 13,742 |  |
Costs capitalized subsequent to acquisition |  |  |  | 327 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,265 |  |
Buildings & Improvements |  |  |  | 14,011 |  |
Total | $ 15,276 |  |  | 15,276 |  |
Accumulated Depreciation | $ (757) |  |  | (757) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 15,276 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 757 |  |  |  |  |
Multi-Family Residential [Member] | Mariposa - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,816 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 399 |  |
Buildings & Improvements |  |  |  | 5,110 |  |
Costs capitalized subsequent to acquisition |  |  |  | 826 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 434 |  |
Buildings & Improvements |  |  |  | 5,901 |  |
Total | 6,335 |  |  | 6,335 |  |
Accumulated Depreciation | $ (1,777) |  |  | (1,777) |  |
Date of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,335 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,777 |  |  |  |  |
Multi-Family Residential [Member] | Meadows - Jamestown, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 590 |  |
Buildings & Improvements |  |  |  | 4,519 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,840 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 685 |  |
Buildings & Improvements |  |  |  | 6,264 |  |
Total | 6,949 |  |  | 6,949 |  |
Accumulated Depreciation | $ (2,486) |  |  | (2,486) |  |
Date of Construction or Acquisition | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,949 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,486 |  |  |  |  |
Multi-Family Residential [Member] | Monticello Crossings - Monticello, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,734 |  |
Buildings & Improvements |  |  |  | 28,151 |  |
Costs capitalized subsequent to acquisition |  |  |  | 641 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,734 |  |
Buildings & Improvements |  |  |  | 28,792 |  |
Total | 30,526 |  |  | 30,526 |  |
Accumulated Depreciation | $ (402) |  |  | (402) |  |
Date of Construction or Acquisition | 2017 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 30,526 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 402 |  |  |  |  |
Multi-Family Residential [Member] | Monticello Village - Monticello, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,853 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 490 |  |
Buildings & Improvements |  |  |  | 3,756 |  |
Costs capitalized subsequent to acquisition |  |  |  | 960 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 631 |  |
Buildings & Improvements |  |  |  | 4,575 |  |
Total | 5,206 |  |  | 5,206 |  |
Accumulated Depreciation | $ (1,489) |  |  | (1,489) |  |
Date of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,206 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,489 |  |  |  |  |
Multi-Family Residential [Member] | Northern Valley - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 110 |  |
Buildings & Improvements |  |  |  | 610 |  |
Costs capitalized subsequent to acquisition |  |  |  | 153 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 122 |  |
Buildings & Improvements |  |  |  | 751 |  |
Total | 873 |  |  | 873 |  |
Accumulated Depreciation | $ (152) |  |  | (152) |  |
Date of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 873 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 152 |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,274 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 303 |  |
Buildings & Improvements |  |  |  | 3,957 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,249 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 361 |  |
Buildings & Improvements |  |  |  | 5,148 |  |
Total | 5,509 |  |  | 5,509 |  |
Accumulated Depreciation | (1,733) |  |  | (1,733) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 5,509 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,733 |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Date of Construction or Acquisition | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Northridge - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,986 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 884 |  |
Buildings & Improvements |  |  |  | 7,515 |  |
Costs capitalized subsequent to acquisition |  |  |  | 132 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 959 |  |
Buildings & Improvements |  |  |  | 7,572 |  |
Total | $ 8,531 |  |  | 8,531 |  |
Accumulated Depreciation | $ (544) |  |  | (544) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 8,531 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 544 |  |  |  |  |
Multi-Family Residential [Member] | Oakmont Estates - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,300 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 422 |  |
Buildings & Improvements |  |  |  | 4,838 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,162 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 697 |  |
Buildings & Improvements |  |  |  | 5,725 |  |
Total | 6,422 |  |  | 6,422 |  |
Accumulated Depreciation | $ (2,096) |  |  | (2,096) |  |
Date of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,422 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,096 |  |  |  |  |
Multi-Family Residential [Member] | Oakwood Estates - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,749 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 543 |  |
Buildings & Improvements |  |  |  | 2,784 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,646 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 860 |  |
Buildings & Improvements |  |  |  | 7,113 |  |
Total | 7,973 |  |  | 7,973 |  |
Accumulated Depreciation | $ (3,640) |  |  | (3,640) |  |
Date of Construction or Acquisition | 1993 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 7,973 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,640 |  |  |  |  |
Multi-Family Residential [Member] | Olympic Village - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 10,158 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,164 |  |
Buildings & Improvements |  |  |  | 10,441 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,734 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,810 |  |
Buildings & Improvements |  |  |  | 13,529 |  |
Total | 15,339 |  |  | 15,339 |  |
Accumulated Depreciation | $ (5,662) |  |  | (5,662) |  |
Date of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 15,339 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,662 |  |  |  |  |
Multi-Family Residential [Member] | Olympik Village - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,128 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,034 |  |
Buildings & Improvements |  |  |  | 6,109 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,449 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,239 |  |
Buildings & Improvements |  |  |  | 8,353 |  |
Total | 9,592 |  |  | 9,592 |  |
Accumulated Depreciation | $ (2,579) |  |  | (2,579) |  |
Date of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 9,592 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,579 |  |  |  |  |
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,661 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 404 |  |
Buildings & Improvements |  |  |  | 3,152 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,654 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 972 |  |
Buildings & Improvements |  |  |  | 6,238 |  |
Total | 7,210 |  |  | 7,210 |  |
Accumulated Depreciation | $ (3,191) |  |  | (3,191) |  |
Date of Construction or Acquisition | 1994 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 7,210 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,191 |  |  |  |  |
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 |  |  |  | 8,195 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,143 |  |
Buildings & Improvements |  |  |  | 9,099 |  |
Costs capitalized subsequent to acquisition |  |  |  | 9,373 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,892 |  |
Buildings & Improvements |  |  |  | 17,723 |  |
Total | $ 19,615 |  |  | 19,615 |  |
Accumulated Depreciation | $ (7,153) |  |  | (7,153) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 19,615 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,153 |  |  |  |  |
Multi-Family Residential [Member] | Pebble Springs - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 716 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 7 |  |
Buildings & Improvements |  |  |  | 748 |  |
Costs capitalized subsequent to acquisition |  |  |  | 207 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 57 |  |
Buildings & Improvements |  |  |  | 905 |  |
Total | 962 |  |  | 962 |  |
Accumulated Depreciation | $ (401) |  |  | (401) |  |
Date of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 962 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 401 |  |  |  |  |
Multi-Family Residential [Member] | Pinehurst - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 121 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 72 |  |
Buildings & Improvements |  |  |  | 687 |  |
Costs capitalized subsequent to acquisition |  |  |  | 418 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 168 |  |
Buildings & Improvements |  |  |  | 1,009 |  |
Total | 1,177 |  |  | 1,177 |  |
Accumulated Depreciation | $ (358) |  |  | (358) |  |
Date of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,177 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 358 |  |  |  |  |
Multi-Family Residential [Member] | Plaza - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,068 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 867 |  |
Buildings & Improvements |  |  |  | 12,784 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,774 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 998 |  |
Buildings & Improvements |  |  |  | 15,427 |  |
Total | 16,425 |  |  | 16,425 |  |
Accumulated Depreciation | $ (3,285) |  |  | (3,285) |  |
Date of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 16,425 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,285 |  |  |  |  |
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,504 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 240 |  |
Buildings & Improvements |  |  |  | 3,538 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,917 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 406 |  |
Buildings & Improvements |  |  |  | 5,289 |  |
Total | 5,695 |  |  | 5,695 |  |
Accumulated Depreciation | $ (2,684) |  |  | (2,684) |  |
Date of Construction or Acquisition | 1994 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,695 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,684 |  |  |  |  |
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Ponds at Heritage Place - Sartell, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,641 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 395 |  |
Buildings & Improvements |  |  |  | 4,564 |  |
Costs capitalized subsequent to acquisition |  |  |  | 425 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 410 |  |
Buildings & Improvements |  |  |  | 4,974 |  |
Total | $ 5,384 |  |  | 5,384 |  |
Accumulated Depreciation | $ (676) |  |  | (676) |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,384 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 676 |  |  |  |  |
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,349 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 144 |  |
Buildings & Improvements |  |  |  | 1,816 |  |
Costs capitalized subsequent to acquisition |  |  |  | 646 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 304 |  |
Buildings & Improvements |  |  |  | 2,302 |  |
Total | 2,606 |  |  | 2,606 |  |
Accumulated Depreciation | $ (1,357) |  |  | (1,357) |  |
Date of Construction or Acquisition | 1993 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,606 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,357 |  |  |  |  |
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 |  |  |  | 26,219 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,254 |  |
Buildings & Improvements |  |  |  | 30,024 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,990 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,401 |  |
Buildings & Improvements |  |  |  | 31,867 |  |
Total | $ 34,268 |  |  | 34,268 |  |
Accumulated Depreciation | $ (6,378) |  |  | (6,378) |  |
Date of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 34,268 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,378 |  |  |  |  |
Multi-Family Residential [Member] | RED 20 - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 22,953 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,900 |  |
Buildings & Improvements |  |  |  | 26,641 |  |
Costs capitalized subsequent to acquisition |  |  |  | 333 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,900 |  |
Buildings & Improvements |  |  |  | 26,974 |  |
Total | 28,874 |  |  | 28,874 |  |
Accumulated Depreciation | $ (2,271) |  |  | (2,271) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 28,874 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,271 |  |  |  |  |
Multi-Family Residential [Member] | Regency Park Estates - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 8,176 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 702 |  |
Buildings & Improvements |  |  |  | 10,198 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,168 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 949 |  |
Buildings & Improvements |  |  |  | 12,119 |  |
Total | 13,068 |  |  | 13,068 |  |
Accumulated Depreciation | $ (1,945) |  |  | (1,945) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 13,068 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,945 |  |  |  |  |
Multi-Family Residential [Member] | Renaissance Heights - Williston, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 23,439 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,080 |  |
Buildings & Improvements |  |  |  | 15,389 |  |
Costs capitalized subsequent to acquisition |  |  |  | 133 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,086 |  |
Buildings & Improvements |  |  |  | 15,516 |  |
Total | 18,602 |  |  | 18,602 |  |
Accumulated Depreciation | $ (279) |  |  | (279) |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 18,602 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 279 |  |  |  |  |
Multi-Family Residential [Member] | Ridge Oaks - Sioux City, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,240 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 178 |  |
Buildings & Improvements |  |  |  | 4,073 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,851 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 307 |  |
Buildings & Improvements |  |  |  | 6,795 |  |
Total | 7,102 |  |  | 7,102 |  |
Accumulated Depreciation | $ (2,584) |  |  | (2,584) |  |
Date of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 7,102 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,584 |  |  |  |  |
Multi-Family Residential [Member] | Rimrock West - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,160 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 330 |  |
Buildings & Improvements |  |  |  | 3,489 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,966 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 476 |  |
Buildings & Improvements |  |  |  | 5,309 |  |
Total | 5,785 |  |  | 5,785 |  |
Accumulated Depreciation | $ (2,066) |  |  | (2,066) |  |
Date of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,785 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,066 |  |  |  |  |
Multi-Family Residential [Member] | River Ridge - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 576 |  |
Buildings & Improvements |  |  |  | 24,670 |  |
Costs capitalized subsequent to acquisition |  |  |  | 804 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 763 |  |
Buildings & Improvements |  |  |  | 25,287 |  |
Total | 26,050 |  |  | 26,050 |  |
Accumulated Depreciation | $ (3,072) |  |  | (3,072) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 26,050 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,072 |  |  |  |  |
Multi-Family Residential [Member] | Rocky Meadows - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,899 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 656 |  |
Buildings & Improvements |  |  |  | 5,726 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,469 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 792 |  |
Buildings & Improvements |  |  |  | 7,059 |  |
Total | 7,851 |  |  | 7,851 |  |
Accumulated Depreciation | $ (3,495) |  |  | (3,495) |  |
Date of Construction or Acquisition | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 7,851 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,495 |  |  |  |  |
Multi-Family Residential [Member] | Rum River - Isanti, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,380 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 843 |  |
Buildings & Improvements |  |  |  | 4,823 |  |
Costs capitalized subsequent to acquisition |  |  |  | 348 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 864 |  |
Buildings & Improvements |  |  |  | 5,150 |  |
Total | 6,014 |  |  | 6,014 |  |
Accumulated Depreciation | $ (1,314) |  |  | (1,314) |  |
Date of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,014 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,314 |  |  |  |  |
Multi-Family Residential [Member] | Sherwood - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 11,686 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,142 |  |
Buildings & Improvements |  |  |  | 14,684 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,795 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,838 |  |
Buildings & Improvements |  |  |  | 18,783 |  |
Total | 20,621 |  |  | 20,621 |  |
Accumulated Depreciation | $ (7,637) |  |  | (7,637) |  |
Date of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 20,621 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,637 |  |  |  |  |
Multi-Family Residential [Member] | Sierra Vista - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,323 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 241 |  |
Buildings & Improvements |  |  |  | 2,097 |  |
Costs capitalized subsequent to acquisition |  |  |  | 520 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 276 |  |
Buildings & Improvements |  |  |  | 2,582 |  |
Total | 2,858 |  |  | 2,858 |  |
Accumulated Depreciation | $ (432) |  |  | (432) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,858 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 432 |  |  |  |  |
Multi-Family Residential [Member] | Silver Springs - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,156 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 215 |  |
Buildings & Improvements |  |  |  | 3,007 |  |
Costs capitalized subsequent to acquisition |  |  |  | 583 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 237 |  |
Buildings & Improvements |  |  |  | 3,568 |  |
Total | 3,805 |  |  | 3,805 |  |
Accumulated Depreciation | $ (271) |  |  | (271) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,805 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 271 |  |  |  |  |
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 8,229 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 550 |  |
Buildings & Improvements |  |  |  | 9,548 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,908 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,370 |  |
Buildings & Improvements |  |  |  | 13,636 |  |
Total | 15,006 |  |  | 15,006 |  |
Accumulated Depreciation | $ (6,351) |  |  | (6,351) |  |
Date of Construction or Acquisition | 1995 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 15,006 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,351 |  |  |  |  |
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Southpoint - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 576 |  |
Buildings & Improvements |  |  |  | 9,893 |  |
Costs capitalized subsequent to acquisition |  |  |  | 147 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 622 |  |
Buildings & Improvements |  |  |  | 9,994 |  |
Total | $ 10,616 |  |  | 10,616 |  |
Accumulated Depreciation | $ (934) |  |  | (934) |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 10,616 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 934 |  |  |  |  |
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,259 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 400 |  |
Buildings & Improvements |  |  |  | 5,034 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,482 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 812 |  |
Buildings & Improvements |  |  |  | 8,104 |  |
Total | 8,916 |  |  | 8,916 |  |
Accumulated Depreciation | $ (4,029) |  |  | (4,029) |  |
Date of Construction or Acquisition | 1995 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 8,916 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,029 |  |  |  |  |
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] | Sunset Trail - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,732 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 336 |  |
Buildings & Improvements |  |  |  | 12,814 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,217 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 687 |  |
Buildings & Improvements |  |  |  | 15,680 |  |
Total | $ 16,367 |  |  | 16,367 |  |
Accumulated Depreciation | $ (6,374) |  |  | (6,374) |  |
Date of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 16,367 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,374 |  |  |  |  |
Multi-Family Residential [Member] | Thomasbrook - Lincoln, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,687 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 600 |  |
Buildings & Improvements |  |  |  | 10,306 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,944 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,430 |  |
Buildings & Improvements |  |  |  | 14,420 |  |
Total | 15,850 |  |  | 15,850 |  |
Accumulated Depreciation | $ (5,322) |  |  | (5,322) |  |
Date of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 15,850 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,322 |  |  |  |  |
Multi-Family Residential [Member] | Valley Park - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,683 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 294 |  |
Buildings & Improvements |  |  |  | 4,137 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,840 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,186 |  |
Buildings & Improvements |  |  |  | 7,085 |  |
Total | 8,271 |  |  | 8,271 |  |
Accumulated Depreciation | $ (3,107) |  |  | (3,107) |  |
Date of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 8,271 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,107 |  |  |  |  |
Multi-Family Residential [Member] | Villa West - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 11,729 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,590 |  |
Buildings & Improvements |  |  |  | 15,760 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,424 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,084 |  |
Buildings & Improvements |  |  |  | 16,690 |  |
Total | 18,774 |  |  | 18,774 |  |
Accumulated Depreciation | $ (2,367) |  |  | (2,367) |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 18,774 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,367 |  |  |  |  |
Multi-Family Residential [Member] | Village Green - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 234 |  |
Buildings & Improvements |  |  |  | 2,296 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,073 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 359 |  |
Buildings & Improvements |  |  |  | 3,244 |  |
Total | 3,603 |  |  | 3,603 |  |
Accumulated Depreciation | $ (1,106) |  |  | (1,106) |  |
Date of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,603 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,106 |  |  |  |  |
Multi-Family Residential [Member] | West Stonehill - Waite Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 8,072 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 939 |  |
Buildings & Improvements |  |  |  | 10,167 |  |
Costs capitalized subsequent to acquisition |  |  |  | 7,618 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,715 |  |
Buildings & Improvements |  |  |  | 17,009 |  |
Total | 18,724 |  |  | 18,724 |  |
Accumulated Depreciation | $ (7,807) |  |  | (7,807) |  |
Date of Construction or Acquisition | 1995 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 18,724 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,807 |  |  |  |  |
Multi-Family Residential [Member] | Westwood Park - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,879 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 116 |  |
Buildings & Improvements |  |  |  | 1,909 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,023 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 287 |  |
Buildings & Improvements |  |  |  | 3,761 |  |
Total | 4,048 |  |  | 4,048 |  |
Accumulated Depreciation | $ (1,681) |  |  | (1,681) |  |
Date of Construction or Acquisition | 1998 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,048 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,681 |  |  |  |  |
Multi-Family Residential [Member] | Whispering Ridge - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 21,257 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,139 |  |
Buildings & Improvements |  |  |  | 25,424 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,365 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,403 |  |
Buildings & Improvements |  |  |  | 26,525 |  |
Total | 28,928 |  |  | 28,928 |  |
Accumulated Depreciation | $ (3,161) |  |  | (3,161) |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 28,928 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,161 |  |  |  |  |
Multi-Family Residential [Member] | Williston Garden - Williston, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,541 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,400 |  |
Buildings & Improvements |  |  |  | 10,200 |  |
Costs capitalized subsequent to acquisition |  |  |  | 211 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,412 |  |
Buildings & Improvements |  |  |  | 10,399 |  |
Total | 11,811 |  |  | 11,811 |  |
Accumulated Depreciation | $ (190) |  |  | (190) |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 11,811 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 190 |  |  |  |  |
Multi-Family Residential [Member] | Winchester - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 748 |  |
Buildings & Improvements |  |  |  | 5,622 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,512 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,044 |  |
Buildings & Improvements |  |  |  | 7,838 |  |
Total | 8,882 |  |  | 8,882 |  |
Accumulated Depreciation | $ (2,672) |  |  | (2,672) |  |
Date of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 8,882 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,672 |  |  |  |  |
Multi-Family Residential [Member] | Woodridge - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,920 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 370 |  |
Buildings & Improvements |  |  |  | 6,028 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,124 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 741 |  |
Buildings & Improvements |  |  |  | 8,781 |  |
Total | 9,522 |  |  | 9,522 |  |
Accumulated Depreciation | $ (4,087) |  |  | (4,087) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 9,522 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,087 |  |  |  |  |
Multi-Family Residential [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Additions | 61,565 | 282,457 | 183,114 |  |  |
Commercial Healthcare [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 96,408 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 21,240 |  |
Buildings & Improvements |  |  |  | 246,477 |  |
Costs capitalized subsequent to acquisition |  |  |  | 55,431 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 22,446 |  |
Buildings & Improvements |  |  |  | 300,702 |  |
Total | 323,148 |  |  | 323,148 |  |
Accumulated Depreciation | (86,139) |  |  | (86,139) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 323,148 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 86,139 |  |  |  |  |
Commercial Healthcare [Member] | 2800 Medical Building - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,358 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 204 |  |
Buildings & Improvements |  |  |  | 7,135 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,663 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 229 |  |
Buildings & Improvements |  |  |  | 9,773 |  |
Total | 10,002 |  |  | 10,002 |  |
Accumulated Depreciation | $ (3,715) |  |  | (3,715) |  |
Date of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 10,002 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,715 |  |  |  |  |
Commercial Healthcare [Member] | 2828 Chicago Avenue - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 11,508 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 726 |  |
Buildings & Improvements |  |  |  | 11,319 |  |
Costs capitalized subsequent to acquisition |  |  |  | 5,380 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 729 |  |
Buildings & Improvements |  |  |  | 16,696 |  |
Total | 17,425 |  |  | 17,425 |  |
Accumulated Depreciation | $ (5,203) |  |  | (5,203) |  |
Date of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 17,425 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,203 |  |  |  |  |
Commercial Healthcare [Member] | Airport Medical - Bloomington, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 4,678 |  |
Costs capitalized subsequent to acquisition |  |  |  | 51 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 11 |  |
Buildings & Improvements |  |  |  | 4,718 |  |
Total | 4,729 |  |  | 4,729 |  |
Accumulated Depreciation | $ (1,967) |  |  | (1,967) |  |
Date of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,729 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,967 |  |  |  |  |
Commercial Healthcare [Member] | Billings 2300 Grant Road - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 649 |  |
Buildings & Improvements |  |  |  | 1,216 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 649 |  |
Buildings & Improvements |  |  |  | 1,216 |  |
Total | 1,865 |  |  | 1,865 |  |
Accumulated Depreciation | $ (207) |  |  | (207) |  |
Date of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,865 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 207 |  |  |  |  |
Commercial Healthcare [Member] | Burnsville 303 Nicollet Medical (Ridgeview) - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,705 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,071 |  |
Buildings & Improvements |  |  |  | 6,842 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,393 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,201 |  |
Buildings & Improvements |  |  |  | 9,105 |  |
Total | 10,306 |  |  | 10,306 |  |
Accumulated Depreciation | $ (2,240) |  |  | (2,240) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 10,306 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,240 |  |  |  |  |
Commercial Healthcare [Member] | Burnsville 305 Nicollet Medical (Ridgeview South) - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,823 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 189 |  |
Buildings & Improvements |  |  |  | 5,127 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,764 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 276 |  |
Buildings & Improvements |  |  |  | 6,804 |  |
Total | 7,080 |  |  | 7,080 |  |
Accumulated Depreciation | $ (1,486) |  |  | (1,486) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 7,080 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,486 |  |  |  |  |
Commercial Healthcare [Member] | Denfeld Clinic - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,180 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 501 |  |
Buildings & Improvements |  |  |  | 2,597 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 501 |  |
Buildings & Improvements |  |  |  | 2,598 |  |
Total | 3,099 |  |  | 3,099 |  |
Accumulated Depreciation | $ (847) |  |  | (847) |  |
Date of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,099 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 847 |  |  |  |  |
Commercial Healthcare [Member] | Eagan 1440 Duckwood Medical - Eagan, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 521 |  |
Buildings & Improvements |  |  |  | 1,547 |  |
Costs capitalized subsequent to acquisition |  |  |  | 556 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 521 |  |
Buildings & Improvements |  |  |  | 2,103 |  |
Total | 2,624 |  |  | 2,624 |  |
Accumulated Depreciation | $ (825) |  |  | (825) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,624 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 825 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6363 France Medical - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 12,675 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,386 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 16,061 |  |
Total | 16,061 |  |  | 16,061 |  |
Accumulated Depreciation | $ (5,179) |  |  | (5,179) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 16,061 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,179 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6405 France Medical - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 12,201 |  |
Costs capitalized subsequent to acquisition |  |  |  | 367 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 12,568 |  |
Total | 12,568 |  |  | 12,568 |  |
Accumulated Depreciation | $ (3,863) |  |  | (3,863) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 12,568 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,863 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6517 Drew Avenue - Edina, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 741 |  |
Buildings & Improvements |  |  |  | 660 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,035 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 959 |  |
Buildings & Improvements |  |  |  | 1,477 |  |
Total | 2,436 |  |  | 2,436 |  |
Accumulated Depreciation | $ (277) |  |  | (277) |  |
Date of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,436 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 277 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6525 France SMC II - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 9,394 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 755 |  |
Buildings & Improvements |  |  |  | 8,054 |  |
Costs capitalized subsequent to acquisition |  |  |  | 6,859 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,040 |  |
Buildings & Improvements |  |  |  | 14,628 |  |
Total | 15,668 |  |  | 15,668 |  |
Accumulated Depreciation | $ (6,817) |  |  | (6,817) |  |
Date of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 15,668 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,817 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6545 France SMC I - Edina MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 28,331 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,480 |  |
Buildings & Improvements |  |  |  | 63,275 |  |
Costs capitalized subsequent to acquisition |  |  |  | 18,446 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,480 |  |
Buildings & Improvements |  |  |  | 81,721 |  |
Total | 85,201 |  |  | 85,201 |  |
Accumulated Depreciation | $ (21,746) |  |  | (21,746) |  |
Date of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 85,201 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 21,746 |  |  |  |  |
Commercial Healthcare [Member] | Fresenius - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 50 |  |
Buildings & Improvements |  |  |  | 1,520 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 50 |  |
Buildings & Improvements |  |  |  | 1,522 |  |
Total | 1,572 |  |  | 1,572 |  |
Accumulated Depreciation | $ (496) |  |  | (496) |  |
Date of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,572 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 496 |  |  |  |  |
Commercial Healthcare [Member] | Garden View - St. Paul, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 7,408 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,175 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 26 |  |
Buildings & Improvements |  |  |  | 8,557 |  |
Total | 8,583 |  |  | 8,583 |  |
Accumulated Depreciation | $ (3,298) |  |  | (3,298) |  |
Date of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 8,583 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,298 |  |  |  |  |
Commercial Healthcare [Member] | Gateway Clinic - Sandstone, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 683 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 77 |  |
Buildings & Improvements |  |  |  | 1,699 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 77 |  |
Buildings & Improvements |  |  |  | 1,699 |  |
Total | 1,776 |  |  | 1,776 |  |
Accumulated Depreciation | $ (554) |  |  | (554) |  |
Date of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,776 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 554 |  |  |  |  |
Commercial Healthcare [Member] | High Pointe Health Campus - Lake Elmo, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,278 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,305 |  |
Buildings & Improvements |  |  |  | 10,528 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,300 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,506 |  |
Buildings & Improvements |  |  |  | 12,627 |  |
Total | 14,133 |  |  | 14,133 |  |
Accumulated Depreciation | $ (4,692) |  |  | (4,692) |  |
Date of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 14,133 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,692 |  |  |  |  |
Commercial Healthcare [Member] | Lakeside Medical Plaza - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 903 |  |
Buildings & Improvements |  |  |  | 5,210 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 903 |  |
Buildings & Improvements |  |  |  | 5,210 |  |
Total | 6,113 |  |  | 6,113 |  |
Accumulated Depreciation | $ (227) |  |  | (227) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,113 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 227 |  |  |  |  |
Commercial Healthcare [Member] | Mariner Clinic - Superior, WI [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,494 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 3,781 |  |
Costs capitalized subsequent to acquisition |  |  |  | 323 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 46 |  |
Buildings & Improvements |  |  |  | 4,058 |  |
Total | 4,104 |  |  | 4,104 |  |
Accumulated Depreciation | $ (1,294) |  |  | (1,294) |  |
Date of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,104 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,294 |  |  |  |  |
Commercial Healthcare [Member] | Minneapolis 701 25th Avenue Medical - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 7,873 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,626 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 9,499 |  |
Total | 9,499 |  |  | 9,499 |  |
Accumulated Depreciation | $ (2,561) |  |  | (2,561) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 9,499 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,561 |  |  |  |  |
Commercial Healthcare [Member] | Missoula 3050 Great Northern - Missoula, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 640 |  |
Buildings & Improvements |  |  |  | 1,331 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 640 |  |
Buildings & Improvements |  |  |  | 1,331 |  |
Total | 1,971 |  |  | 1,971 |  |
Accumulated Depreciation | $ (226) |  |  | (226) |  |
Date of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,971 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 226 |  |  |  |  |
Commercial Healthcare [Member] | Park Dental - Brooklyn Center, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 185 |  |
Buildings & Improvements |  |  |  | 2,767 |  |
Costs capitalized subsequent to acquisition |  |  |  | 15 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 200 |  |
Buildings & Improvements |  |  |  | 2,767 |  |
Total | 2,967 |  |  | 2,967 |  |
Accumulated Depreciation | $ (1,013) |  |  | (1,013) |  |
Date of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,967 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,013 |  |  |  |  |
Commercial Healthcare [Member] | Pavilion I - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,937 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,245 |  |
Buildings & Improvements |  |  |  | 8,898 |  |
Costs capitalized subsequent to acquisition |  |  |  | 391 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,245 |  |
Buildings & Improvements |  |  |  | 9,289 |  |
Total | 10,534 |  |  | 10,534 |  |
Accumulated Depreciation | $ (2,915) |  |  | (2,915) |  |
Date of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 10,534 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,915 |  |  |  |  |
Commercial Healthcare [Member] | Pavilion II - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,245 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,715 |  |
Buildings & Improvements |  |  |  | 14,673 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,937 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,715 |  |
Buildings & Improvements |  |  |  | 16,610 |  |
Total | 19,325 |  |  | 19,325 |  |
Accumulated Depreciation | $ (6,676) |  |  | (6,676) |  |
Date of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 19,325 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,676 |  |  |  |  |
Commercial Healthcare [Member] | PrairieCare Medical - Brooklyn Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,610 |  |
Buildings & Improvements |  |  |  | 21,847 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,610 |  |
Buildings & Improvements |  |  |  | 21,847 |  |
Total | 24,457 |  |  | 24,457 |  |
Accumulated Depreciation | $ (1,104) |  |  | (1,104) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 24,457 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,104 |  |  |  |  |
Commercial Healthcare [Member] | Ritchie Medical Plaza - St Paul, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,615 |  |
Buildings & Improvements |  |  |  | 7,851 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,447 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,647 |  |
Buildings & Improvements |  |  |  | 12,266 |  |
Total | 13,913 |  |  | 13,913 |  |
Accumulated Depreciation | $ (3,982) |  |  | (3,982) |  |
Date of Construction or Acquisition | 2005 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 13,913 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,982 |  |  |  |  |
Commercial Healthcare [Member] | St Michael Clinic - St Michael, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 328 |  |
Buildings & Improvements |  |  |  | 2,259 |  |
Costs capitalized subsequent to acquisition |  |  |  | 296 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 349 |  |
Buildings & Improvements |  |  |  | 2,534 |  |
Total | 2,883 |  |  | 2,883 |  |
Accumulated Depreciation | $ (637) |  |  | (637) |  |
Date of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,883 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 637 |  |  |  |  |
Commercial Healthcare [Member] | Trinity at Plaza 16 - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,430 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 568 |  |
Buildings & Improvements |  |  |  | 9,009 |  |
Costs capitalized subsequent to acquisition |  |  |  | 16 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 674 |  |
Buildings & Improvements |  |  |  | 8,919 |  |
Total | 9,593 |  |  | 9,593 |  |
Accumulated Depreciation | $ (1,278) |  |  | (1,278) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 9,593 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,278 |  |  |  |  |
Commercial Healthcare [Member] | Wells Clinic - Hibbing, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,042 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 162 |  |
Buildings & Improvements |  |  |  | 2,497 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 162 |  |
Buildings & Improvements |  |  |  | 2,499 |  |
Total | 2,661 |  |  | 2,661 |  |
Accumulated Depreciation | $ (814) |  |  | (814) |  |
Date of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,661 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 814 |  |  |  |  |
Commercial Healthcare [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Additions |  | 63,605 |  |  |  |
All Other [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 20,529 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 11,783 |  |
Buildings & Improvements |  |  |  | 57,217 |  |
Costs capitalized subsequent to acquisition |  |  |  | 24,792 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 12,692 |  |
Buildings & Improvements |  |  |  | 81,100 |  |
Total | 93,792 |  |  | 93,792 |  |
Accumulated Depreciation | (21,686) |  |  | (21,686) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 93,792 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 21,686 |  |  |  |  |
All Other [Member] | Bismarck 715 East Broadway - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,974 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 389 |  |
Buildings & Improvements |  |  |  | 1,283 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,134 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 443 |  |
Buildings & Improvements |  |  |  | 2,363 |  |
Total | 2,806 |  |  | 2,806 |  |
Accumulated Depreciation | $ (630) |  |  | (630) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,806 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 630 |  |  |  |  |
All Other [Member] | Bloomington 2000 W 94th Street - Bloomington, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,133 |  |
Buildings & Improvements |  |  |  | 4,097 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,322 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,241 |  |
Buildings & Improvements |  |  |  | 5,311 |  |
Total | 7,552 |  |  | 7,552 |  |
Accumulated Depreciation | $ (1,878) |  |  | (1,878) |  |
Date of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 7,552 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,878 |  |  |  |  |
All Other [Member] | Dakota West Plaza - Minot , ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 328 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 92 |  |
Buildings & Improvements |  |  |  | 493 |  |
Costs capitalized subsequent to acquisition |  |  |  | 30 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 106 |  |
Buildings & Improvements |  |  |  | 509 |  |
Total | 615 |  |  | 615 |  |
Accumulated Depreciation | $ (149) |  |  | (149) |  |
Date of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 615 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 149 |  |  |  |  |
All Other [Member] | Lexington Commerce Center - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,399 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 453 |  |
Buildings & Improvements |  |  |  | 4,352 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,101 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 512 |  |
Buildings & Improvements |  |  |  | 6,394 |  |
Total | 6,906 |  |  | 6,906 |  |
Accumulated Depreciation | $ (3,209) |  |  | (3,209) |  |
Date of Construction or Acquisition | 1999 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,906 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,209 |  |  |  |  |
All Other [Member] | Minot 1400 31st Ave - Minot, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,026 |  |
Buildings & Improvements |  |  |  | 6,143 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,404 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,038 |  |
Buildings & Improvements |  |  |  | 10,535 |  |
Total | 11,573 |  |  | 11,573 |  |
Accumulated Depreciation | $ (3,521) |  |  | (3,521) |  |
Date of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 11,573 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,521 |  |  |  |  |
All Other [Member] | Minot 2505 16th Street SW - Minot, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 298 |  |
Buildings & Improvements |  |  |  | 1,724 |  |
Costs capitalized subsequent to acquisition |  |  |  | 296 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 298 |  |
Buildings & Improvements |  |  |  | 2,020 |  |
Total | 2,318 |  |  | 2,318 |  |
Accumulated Depreciation | $ (427) |  |  | (427) |  |
Date of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,318 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 427 |  |  |  |  |
All Other [Member] | Minot Arrowhead - Minot, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 100 |  |
Buildings & Improvements |  |  |  | 3,216 |  |
Costs capitalized subsequent to acquisition |  |  |  | 5,583 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 176 |  |
Buildings & Improvements |  |  |  | 8,723 |  |
Total | 8,899 |  |  | 8,899 |  |
Accumulated Depreciation | $ (2,740) |  |  | (2,740) |  |
Date of Construction or Acquisition | 1973 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 8,899 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,740 |  |  |  |  |
All Other [Member] | Minot IPS - Minot, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 416 |  |
Buildings & Improvements |  |  |  | 5,952 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 416 |  |
Buildings & Improvements |  |  |  | 5,952 |  |
Total | 6,368 |  |  | 6,368 |  |
Accumulated Depreciation | $ (699) |  |  | (699) |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,368 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 699 |  |  |  |  |
All Other [Member] | Minot Southgate Retail - Minot, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 889 |  |
Buildings & Improvements |  |  |  | 1,748 |  |
Costs capitalized subsequent to acquisition |  |  |  | 68 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 889 |  |
Buildings & Improvements |  |  |  | 1,816 |  |
Total | 2,705 |  |  | 2,705 |  |
Accumulated Depreciation | $ (74) |  |  | (74) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,705 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 74 |  |  |  |  |
All Other [Member] | Plaza 16 - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 6,726 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 389 |  |
Buildings & Improvements |  |  |  | 5,444 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,764 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 598 |  |
Buildings & Improvements |  |  |  | 8,999 |  |
Total | 9,597 |  |  | 9,597 |  |
Accumulated Depreciation | $ (2,675) |  |  | (2,675) |  |
Date of Construction or Acquisition | 2009 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 9,597 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,675 |  |  |  |  |
All Other [Member] | Roseville 3075 Long Lake Road - Roseville, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 810 |  |
Buildings & Improvements |  |  |  | 10,244 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,045 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 810 |  |
Buildings & Improvements |  |  |  | 12,289 |  |
Total | 13,099 |  |  | 13,099 |  |
Accumulated Depreciation | $ (1,043) |  |  | (1,043) |  |
Date of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 13,099 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,043 |  |  |  |  |
All Other [Member] | Urbandale 3900 106th Street - Urbandale, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 10,102 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,680 |  |
Buildings & Improvements |  |  |  | 9,893 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,982 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,863 |  |
Buildings & Improvements |  |  |  | 11,692 |  |
Total | 15,555 |  |  | 15,555 |  |
Accumulated Depreciation | $ (3,347) |  |  | (3,347) |  |
Date of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 15,555 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,347 |  |  |  |  |
All Other [Member] | Woodbury 1865 Woodlane - Woodbury, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,108 |  |
Buildings & Improvements |  |  |  | 2,628 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,063 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,302 |  |
Buildings & Improvements |  |  |  | 4,497 |  |
Total | 5,799 |  |  | 5,799 |  |
Accumulated Depreciation | $ (1,294) |  |  | (1,294) |  |
Date of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,799 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,294 |  |  |  |  |
All Other [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Additions |  | $ 2,623 | $ 12,223 |  |  |
Subtotal [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 665,338 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 115,144 |  |
Buildings & Improvements |  |  |  | 1,307,790 |  |
Costs capitalized subsequent to acquisition |  |  |  | 254,547 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 136,365 |  |
Buildings & Improvements |  |  |  | 1,541,116 |  |
Total | 1,677,481 |  |  | 1,677,481 |  |
Accumulated Depreciation | (340,417) |  |  | $ (340,417) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 1,677,481 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 340,417 |  |  |  |  |

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