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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
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Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | $ 817,074 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 138,997 |  |
Buildings & Improvements |  |  |  | 1,382,158 |  |
Costs capitalized subsequent to acquisition |  |  |  | 232,936 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 161,153 |  |
Buildings & Improvements |  |  |  | 1,592,938 |  |
Total | $ 1,754,091 |  |  | 1,754,091 |  |
Accumulated Depreciation | $ (279,417) | $ (273,934) | $ (266,212) | (312,889) | $ (279,417) | $ (273,934)
Maximum borrowing capacity |  |  |  | 100,000 |  |
Advances under the facility specified as percentage of value of properties provided as security (in hundredths) | 60.00% |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Write down of asset and accumulated depreciation on impaired assets |  | (881) | (6,291) |  |  |
Balance at close of year | $ 1,754,091 |  |  |  |  |
Reconciliations of accumulated depreciation/amortization [Abstract] |  |  |  |  |  |
Balance at beginning of year | 279,417 | 273,934 | 266,212 |  |  |
Additions during year [Abstract] |  |  |  |  |  |
Provisions for depreciation | 47,064 | 40,078 | 35,391 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Accumulated depreciation on real estate sold | (9,957) | (29,463) | (19,413) |  |  |
Write down of asset and accumulated depreciation on impaired assets |  | (881) | (6,291) |  |  |
Other | (3,635) | (4,251) | (1,965) |  |  |
Balance at close of year | 312,889 | 279,417 | 273,934 |  |  |
Total real estate investments |  |  |  | 1,441,202 | 1,236,091 |
Net basis of real estate investments for federal income tax purposes |  |  |  | 1,600 | 1,700 | 1,500
Discontinued Operations [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 68,824 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 14,717 |  |
Buildings & Improvements |  |  |  | 207,937 |  |
Costs capitalized subsequent to acquisition |  |  |  | 43,873 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 14,824 |  |
Buildings & Improvements |  |  |  | 251,703 |  |
Total | 266,527 |  |  | 266,527 |  |
Accumulated Depreciation | (59,137) |  |  | (59,137) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 266,527 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 59,137 |  |  |  |  |
Discontinued Operations [Member] | Casper 1930 E 12th Street (Park Place) - Casper, WY [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 439 |  |
Buildings & Improvements |  |  |  | 5,780 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,296 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 439 |  |
Buildings & Improvements |  |  |  | 7,076 |  |
Total | 7,515 |  |  | 7,515 |  |
Accumulated Depreciation | $ (1,374) |  |  | (1,374) |  |
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 | $ 7,515 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,374 |  |  |  |  |
Discontinued Operations [Member] | Casper 3955 E 12th Street (Meadow Wind) - Casper, WY [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 388 |  |
Buildings & Improvements |  |  |  | 10,494 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,700 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 459 |  |
Buildings & Improvements |  |  |  | 12,123 |  |
Total | 12,582 |  |  | 12,582 |  |
Accumulated Depreciation | $ (2,263) |  |  | (2,263) |  |
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 | $ 12,582 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,263 |  |  |  |  |
Discontinued Operations [Member] | Cheyenne 4010 N College Drive (Aspen Wind) - Cheyenne, WY [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 628 |  |
Buildings & Improvements |  |  |  | 10,272 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,243 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 629 |  |
Buildings & Improvements |  |  |  | 12,514 |  |
Total | 13,143 |  |  | 13,143 |  |
Accumulated Depreciation | $ (2,360) |  |  | (2,360) |  |
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 | $ 13,143 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,360 |  |  |  |  |
Discontinued Operations [Member] | Cheyenne 4606 N College Drive (Sierra Hills) - Cheyenne, WY [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 695 |  |
Buildings & Improvements |  |  |  | 7,455 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,468 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 695 |  |
Buildings & Improvements |  |  |  | 8,923 |  |
Total | 9,618 |  |  | 9,618 |  |
Accumulated Depreciation | $ (1,661) |  |  | (1,661) |  |
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 | $ 9,618 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,661 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Belgrade, MT [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 35 |  |
Buildings & Improvements |  |  |  | 779 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,129 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 35 |  |
Buildings & Improvements |  |  |  | 1,908 |  |
Total | 1,943 |  |  | 1,943 |  |
Accumulated Depreciation | $ (663) |  |  | (663) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,943 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 663 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,723 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 115 |  |
Buildings & Improvements |  |  |  | 1,767 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,033 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 115 |  |
Buildings & Improvements |  |  |  | 3,800 |  |
Total | 3,915 |  |  | 3,915 |  |
Accumulated Depreciation | $ (1,276) |  |  | (1,276) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,915 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,276 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Bismarck, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 511 |  |
Buildings & Improvements |  |  |  | 9,193 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,018 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 511 |  |
Buildings & Improvements |  |  |  | 10,211 |  |
Total | 10,722 |  |  | 10,722 |  |
Accumulated Depreciation | $ (2,829) |  |  | (2,829) |  |
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 | $ 10,722 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,829 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Brainerd, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 587 |  |
Buildings & Improvements |  |  |  | 8,999 |  |
Costs capitalized subsequent to acquisition |  |  |  | 916 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 587 |  |
Buildings & Improvements |  |  |  | 9,915 |  |
Total | 10,502 |  |  | 10,502 |  |
Accumulated Depreciation | $ (2,760) |  |  | (2,760) |  |
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 | $ 10,502 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,760 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Columbus, NE [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 43 |  |
Buildings & Improvements |  |  |  | 824 |  |
Costs capitalized subsequent to acquisition |  |  |  | 531 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 44 |  |
Buildings & Improvements |  |  |  | 1,354 |  |
Total | 1,398 |  |  | 1,398 |  |
Accumulated Depreciation | $ (404) |  |  | (404) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,398 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 404 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - East Grand Forks, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,625 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 290 |  |
Buildings & Improvements |  |  |  | 1,352 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,864 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 290 |  |
Buildings & Improvements |  |  |  | 4,216 |  |
Total | 4,506 |  |  | 4,506 |  |
Accumulated Depreciation | $ (1,557) |  |  | (1,557) |  |
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 | $ 4,506 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,557 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Fargo, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 11,297 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 775 |  |
Buildings & Improvements |  |  |  | 20,870 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,032 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 775 |  |
Buildings & Improvements |  |  |  | 24,902 |  |
Total | 25,677 |  |  | 25,677 |  |
Accumulated Depreciation | $ (5,964) |  |  | (5,964) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 25,677 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,964 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Fremont, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 528 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 56 |  |
Buildings & Improvements |  |  |  | 490 |  |
Costs capitalized subsequent to acquisition |  |  |  | 59 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 56 |  |
Buildings & Improvements |  |  |  | 549 |  |
Total | 605 |  |  | 605 |  |
Accumulated Depreciation | $ (193) |  |  | (193) |  |
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 | $ 605 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 193 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Grand Island, NE [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 33 |  |
Buildings & Improvements |  |  |  | 773 |  |
Costs capitalized subsequent to acquisition |  |  |  | 540 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 39 |  |
Buildings & Improvements |  |  |  | 1,307 |  |
Total | 1,346 |  |  | 1,346 |  |
Accumulated Depreciation | $ (400) |  |  | (400) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,346 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 400 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Hastings, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 544 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 49 |  |
Buildings & Improvements |  |  |  | 517 |  |
Costs capitalized subsequent to acquisition |  |  |  | 62 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 50 |  |
Buildings & Improvements |  |  |  | 578 |  |
Total | 628 |  |  | 628 |  |
Accumulated Depreciation | $ (213) |  |  | (213) |  |
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 | $ 628 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 213 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Hermantown I, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 14,576 |  |
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] |  |  |  |  |  |
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] | Edgewood Vista - Kalispell, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 545 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 70 |  |
Buildings & Improvements |  |  |  | 502 |  |
Costs capitalized subsequent to acquisition |  |  |  | 625 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 70 |  |
Buildings & Improvements |  |  |  | 1,127 |  |
Total | 1,197 |  |  | 1,197 |  |
Accumulated Depreciation | $ (442) |  |  | (442) |  |
Date of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,197 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 442 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 8,768 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,045 |  |
Buildings & Improvements |  |  |  | 11,590 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,805 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,047 |  |
Buildings & Improvements |  |  |  | 14,393 |  |
Total | 15,440 |  |  | 15,440 |  |
Accumulated Depreciation | $ (3,000) |  |  | (3,000) |  |
Date of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 15,440 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,000 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Missoula, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 774 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 109 |  |
Buildings & Improvements |  |  |  | 854 |  |
Costs capitalized subsequent to acquisition |  |  |  | 72 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 116 |  |
Buildings & Improvements |  |  |  | 919 |  |
Total | 1,035 |  |  | 1,035 |  |
Accumulated Depreciation | $ (439) |  |  | (439) |  |
Date of Construction or Acquisition | 1996 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,035 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 439 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Norfolk, NE [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 42 |  |
Buildings & Improvements |  |  |  | 722 |  |
Costs capitalized subsequent to acquisition |  |  |  | 494 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 42 |  |
Buildings & Improvements |  |  |  | 1,216 |  |
Total | 1,258 |  |  | 1,258 |  |
Accumulated Depreciation | $ (366) |  |  | (366) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,258 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 366 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 345 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 89 |  |
Buildings & Improvements |  |  |  | 547 |  |
Costs capitalized subsequent to acquisition |  |  |  | 55 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 89 |  |
Buildings & Improvements |  |  |  | 602 |  |
Total | 691 |  |  | 691 |  |
Accumulated Depreciation | $ (218) |  |  | (218) |  |
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 | $ 691 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 218 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 987 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 314 |  |
Buildings & Improvements |  |  |  | 974 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,754 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 314 |  |
Buildings & Improvements |  |  |  | 2,728 |  |
Total | 3,042 |  |  | 3,042 |  |
Accumulated Depreciation | $ (993) |  |  | (993) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,042 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 993 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Spearfish, SD [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 315 |  |
Buildings & Improvements |  |  |  | 8,584 |  |
Costs capitalized subsequent to acquisition |  |  |  | 664 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 330 |  |
Buildings & Improvements |  |  |  | 9,233 |  |
Total | 9,563 |  |  | 9,563 |  |
Accumulated Depreciation | $ (2,144) |  |  | (2,144) |  |
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 | $ 9,563 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,144 |  |  |  |  |
Discontinued Operations [Member] | Edgewood Vista - Virginia, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 12,399 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 246 |  |
Buildings & Improvements |  |  |  | 11,823 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,581 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 246 |  |
Buildings & Improvements |  |  |  | 16,404 |  |
Total | 16,650 |  |  | 16,650 |  |
Accumulated Depreciation | $ (5,886) |  |  | (5,886) |  |
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 | $ 16,650 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,886 |  |  |  |  |
Discontinued Operations [Member] | Georgetown Square - Grand Chute, WI [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 250 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 250 |  |
Total | $ 250 |  |  | 250 |  |
Date of Construction or Acquisition | 2006 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 250 |  |  |  |  |
Discontinued Operations [Member] | Laramie 1072 N 22nd Street (Spring Wind) - Laramie, WY [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 406 |  |
Buildings & Improvements |  |  |  | 10,151 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,296 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 406 |  |
Buildings & Improvements |  |  |  | 11,447 |  |
Total | 11,853 |  |  | 11,853 |  |
Accumulated Depreciation | $ (1,964) |  |  | (1,964) |  |
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 | $ 11,853 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,964 |  |  |  |  |
Discontinued Operations [Member] | Legends at Heritage Place - Sartell, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 970 |  |
Buildings & Improvements |  |  |  | 9,920 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 970 |  |
Buildings & Improvements |  |  |  | 9,920 |  |
Total | 10,890 |  |  | 10,890 |  |
Accumulated Depreciation | $ (630) |  |  | (630) |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 10,890 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 630 |  |  |  |  |
Discontinued Operations [Member] | Legends at Heritage Place - Sartell, MN, Unimproved Land [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 537 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 537 |  |
Total | $ 537 |  |  | 537 |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 537 |  |  |  |  |
Discontinued Operations [Member] | Pinecone Villas - Sartell, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 584 |  |
Buildings & Improvements |  |  |  | 2,191 |  |
Costs capitalized subsequent to acquisition |  |  |  | 47 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 587 |  |
Buildings & Improvements |  |  |  | 2,235 |  |
Total | 2,822 |  |  | 2,822 |  |
Accumulated Depreciation | $ (159) |  |  | (159) |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,822 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 159 |  |  |  |  |
Discontinued Operations [Member] | Sartell 2000 23rd Street South - Sartell, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 662 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 6,400 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 6,400 |  |
Total | $ 6,400 |  |  | 6,400 |  |
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 | $ 6,400 |  |  |  |  |
Discontinued Operations [Member] | Spring Creek American Falls American Falls ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,955 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 145 |  |
Buildings & Improvements |  |  |  | 3,870 |  |
Costs capitalized subsequent to acquisition |  |  |  | 55 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 145 |  |
Buildings & Improvements |  |  |  | 3,925 |  |
Total | 4,070 |  |  | 4,070 |  |
Accumulated Depreciation | $ (542) |  |  | (542) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,070 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 542 |  |  |  |  |
Discontinued Operations [Member] | Spring Creek-Boise - Boise, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,640 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 708 |  |
Buildings & Improvements |  |  |  | 4,296 |  |
Costs capitalized subsequent to acquisition |  |  |  | 71 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 708 |  |
Buildings & Improvements |  |  |  | 4,367 |  |
Total | 5,075 |  |  | 5,075 |  |
Accumulated Depreciation | $ (649) |  |  | (649) |  |
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 | $ 5,075 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 649 |  |  |  |  |
Discontinued Operations [Member] | Spring Creek-Eagle - Eagle, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,799 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 263 |  |
Buildings & Improvements |  |  |  | 3,775 |  |
Costs capitalized subsequent to acquisition |  |  |  | 62 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 263 |  |
Buildings & Improvements |  |  |  | 3,837 |  |
Total | 4,100 |  |  | 4,100 |  |
Accumulated Depreciation | $ (534) |  |  | (534) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,100 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 534 |  |  |  |  |
Discontinued Operations [Member] | Spring Creek Fruitland - Fruitland, ID [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 550 |  |
Buildings & Improvements |  |  |  | 6,565 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 550 |  |
Buildings & Improvements |  |  |  | 6,565 |  |
Total | 7,115 |  |  | 7,115 |  |
Accumulated Depreciation | $ (462) |  |  | (462) |  |
Date of Construction or Acquisition | 2014 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 7,115 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 462 |  |  |  |  |
Discontinued Operations [Member] | Spring Creek Fruitland - Fruitland, ID, Unimproved Land [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 339 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 339 |  |
Total | $ 339 |  |  | 339 |  |
Date of Construction or Acquisition | 2014 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 339 |  |  |  |  |
Discontinued Operations [Member] | Spring Creek-Meridian - Meridian, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,972 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 424 |  |
Buildings & Improvements |  |  |  | 6,724 |  |
Costs capitalized subsequent to acquisition |  |  |  | 102 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 424 |  |
Buildings & Improvements |  |  |  | 6,826 |  |
Total | 7,250 |  |  | 7,250 |  |
Accumulated Depreciation | $ (938) |  |  | (938) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 7,250 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 938 |  |  |  |  |
Discontinued Operations [Member] | Spring Creek-Overland - Overland, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,981 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 687 |  |
Buildings & Improvements |  |  |  | 5,942 |  |
Costs capitalized subsequent to acquisition |  |  |  | 96 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 687 |  |
Buildings & Improvements |  |  |  | 6,038 |  |
Total | 6,725 |  |  | 6,725 |  |
Accumulated Depreciation | $ (867) |  |  | (867) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,725 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 867 |  |  |  |  |
Discontinued Operations [Member] | Spring Creek-Soda Springs - Soda Springs, ID [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 704 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 66 |  |
Buildings & Improvements |  |  |  | 2,124 |  |
Costs capitalized subsequent to acquisition |  |  |  | 63 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 66 |  |
Buildings & Improvements |  |  |  | 2,187 |  |
Total | 2,253 |  |  | 2,253 |  |
Accumulated Depreciation | $ (304) |  |  | (304) |  |
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 | $ 2,253 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 304 |  |  |  |  |
Discontinued Operations [Member] | Spring Creek-Ustick - Meridian, ID [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 467 |  |
Buildings & Improvements |  |  |  | 3,833 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 467 |  |
Buildings & Improvements |  |  |  | 3,833 |  |
Total | 4,300 |  |  | 4,300 |  |
Accumulated Depreciation | $ (473) |  |  | (473) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,300 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 473 |  |  |  |  |
Discontinued Operations [Member] | Stone Container - Fargo, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 440 |  |
Buildings & Improvements |  |  |  | 6,597 |  |
Costs capitalized subsequent to acquisition |  |  |  | 104 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 440 |  |
Buildings & Improvements |  |  |  | 6,701 |  |
Total | 7,141 |  |  | 7,141 |  |
Accumulated Depreciation | $ (3,111) |  |  | (3,111) |  |
Date of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 7,141 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,111 |  |  |  |  |
Wholly Owned Properties [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Total | 1,335,687 | 1,241,195 | 1,244,860 | 1,681,471 | 1,335,687 | 1,241,195
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at beginning of year | 1,335,687 | 1,241,195 | 1,244,860 |  |  |
Transfers | (32,438) | (97,824) | (10,307) |  |  |
Improvements and Other | 34,619 | 21,006 | 24,317 |  |  |
Total Additions | 1,718,991 | 1,457,538 | 1,353,294 |  |  |
Cost of real estate sold | (1,305) | (17,904) | (85,029) |  |  |
Impairment charge |  | (1,566) | (8,323) |  |  |
Write down of asset and accumulated depreciation on impaired assets |  | (881) | (6,291) |  |  |
Other | (3,777) | (3,676) | (2,149) |  |  |
Balance at close of year | 1,681,471 | 1,335,687 | 1,241,195 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Write down of asset and accumulated depreciation on impaired assets |  | (881) | (6,291) |  |  |
Development in Progress [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,235 |  |
Buildings & Improvements |  |  |  | 41,887 |  |
Costs capitalized subsequent to acquisition |  |  |  | 6,559 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,235 |  |
Buildings & Improvements |  |  |  | 48,446 |  |
Total | 153,994 | 104,609 | 46,782 | 51,681 | 153,994 | 104,609
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at beginning of year | 153,994 | 104,609 | 46,782 |  |  |
Acquisitions |  | 12,647 | 2,079 |  |  |
Transfers | 1,734 | 7,015 | 2,870 |  |  |
Improvements and Other | 96,753 | 189,306 | 123,240 |  |  |
Involuntary conversion |  |  | (7,052) |  |  |
Development placed in service | (200,800) | (159,578) | (63,210) |  |  |
Other |  | (5) | (100) |  |  |
Balance at close of year | 51,681 | 153,994 | 104,609 |  |  |
Development in Progress [Member] | 71 France - Edina, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,501 |  |
Buildings & Improvements |  |  |  | 28,100 |  |
Costs capitalized subsequent to acquisition |  |  |  | 814 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,501 |  |
Buildings & Improvements |  |  |  | 28,914 |  |
Total | $ 30,415 |  |  | 30,415 |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 30,415 |  |  |  |  |
Development in Progress [Member] | Other [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,759 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 3,759 |  |
Total | 3,759 |  |  | 3,759 |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 3,759 |  |  |  |  |
Development in Progress [Member] | Monticello 7th Addition - Monticello, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,734 |  |
Buildings & Improvements |  |  |  | 13,787 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,986 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,734 |  |
Buildings & Improvements |  |  |  | 15,773 |  |
Total | $ 17,507 |  |  | 17,507 |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 17,507 |  |  |  |  |
Unimproved Land [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 18,478 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,461 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 20,939 |  |
Total | 25,827 | 22,864 | 21,503 | 20,939 | 25,827 | 22,864
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at beginning of year | 25,827 | 22,864 | 21,503 |  |  |
Acquisitions |  | 10,487 | 3,022 |  |  |
Transfers | (1,632) | (79) |  |  |  |
Improvements and Other | 205 | 1,533 | 1,209 |  |  |
Cost of real estate sold | (442) | (670) |  |  |  |
Impairment charge | (1,285) | (1,293) |  |  |  |
Development placed in service | (1,734) | (7,015) | (2,870) |  |  |
Balance at close of year | 20,939 | 25,827 | 22,864 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Total real estate investments |  |  |  | 1,441,202 | $ 1,236,091 | $ 1,094,734
Unimproved Land [Member] | 288 unit - Renaissance Heights - Williston, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,229 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,701 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,930 |  |
Total | $ 3,930 |  |  | 3,930 |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,930 |  |  |  |  |
Unimproved Land [Member] | Badger Hills - Rochester, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,050 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,050 |  |
Total | $ 1,050 |  |  | 1,050 |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,050 |  |  |  |  |
Unimproved Land [Member] | Bismarck 4916 - Bismarck, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,250 |  |
Costs capitalized subsequent to acquisition |  |  |  | 17 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,267 |  |
Total | $ 3,267 |  |  | 3,267 |  |
Date of Construction or Acquisition | 2013 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,267 |  |  |  |  |
Unimproved Land [Member] | Bismarck 700 E Main - Bismarck, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 314 |  |
Costs capitalized subsequent to acquisition |  |  |  | 568 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 882 |  |
Total | $ 882 |  |  | 882 |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 882 |  |  |  |  |
Unimproved Land [Member] | Creekside Crossing - Bismarck, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 4,286 |  |
Costs capitalized subsequent to acquisition |  |  |  | 66 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 4,352 |  |
Total | $ 4,352 |  |  | 4,352 |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,352 |  |  |  |  |
Unimproved Land [Member] | Grand Forks Grand Forks, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 4,278 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 4,278 |  |
Total | $ 4,278 |  |  | 4,278 |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,278 |  |  |  |  |
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 |  |  |  | 1,262 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,262 |  |
Total | $ 1,262 |  |  | 1,262 |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,262 |  |  |  |  |
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 |  |  |  | 109 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 114 |  |
Total | $ 114 |  |  | 114 |  |
Date of Construction or Acquisition | 2009 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 114 |  |  |  |  |
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 |  |  |  | 623,429 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 79,801 |  |
Buildings & Improvements |  |  |  | 1,013,203 |  |
Costs capitalized subsequent to acquisition |  |  |  | 150,905 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 98,012 |  |
Buildings & Improvements |  |  |  | 1,145,897 |  |
Total | 1,243,909 |  |  | 1,243,909 |  |
Accumulated Depreciation | (209,156) |  |  | (209,156) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 1,243,909 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 209,156 |  |  |  |  |
Multi-Family Residential [Member] | 71 France - Edina, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,220 |  |
Buildings & Improvements |  |  |  | 38,092 |  |
Costs capitalized subsequent to acquisition |  |  |  | 27 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,220 |  |
Buildings & Improvements |  |  |  | 38,119 |  |
Total | 41,339 |  |  | 41,339 |  |
Accumulated Depreciation | $ (611) |  |  | (611) |  |
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 | $ 41,339 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 611 |  |  |  |  |
Multi-Family Residential [Member] | 11th Street 3 Plex - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 81 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 11 |  |
Buildings & Improvements |  |  |  | 53 |  |
Costs capitalized subsequent to acquisition |  |  |  | 20 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 20 |  |
Buildings & Improvements |  |  |  | 64 |  |
Total | 84 |  |  | 84 |  |
Accumulated Depreciation | $ (15) |  |  | (15) |  |
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 | $ 84 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 15 |  |  |  |  |
Multi-Family Residential [Member] | 4th Street 4 Plex - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 94 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 15 |  |
Buildings & Improvements |  |  |  | 74 |  |
Costs capitalized subsequent to acquisition |  |  |  | 37 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 26 |  |
Buildings & Improvements |  |  |  | 100 |  |
Total | 126 |  |  | 126 |  |
Accumulated Depreciation | $ (23) |  |  | (23) |  |
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 | $ 126 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 23 |  |  |  |  |
Multi-Family Residential [Member] | Alps Park - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,833 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 287 |  |
Buildings & Improvements |  |  |  | 5,551 |  |
Costs capitalized subsequent to acquisition |  |  |  | 243 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 308 |  |
Buildings & Improvements |  |  |  | 5,773 |  |
Total | 6,081 |  |  | 6,081 |  |
Accumulated Depreciation | $ (466) |  |  | (466) |  |
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 | $ 6,081 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 466 |  |  |  |  |
Multi-Family Residential [Member] | Apartments on Main - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 618 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 158 |  |
Buildings & Improvements |  |  |  | 1,123 |  |
Costs capitalized subsequent to acquisition |  |  |  | 59 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 195 |  |
Buildings & Improvements |  |  |  | 1,145 |  |
Total | 1,340 |  |  | 1,340 |  |
Accumulated Depreciation | $ (275) |  |  | (275) |  |
Date of Construction or Acquisition | 1987 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,340 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 275 |  |  |  |  |
Multi-Family Residential [Member] | Apartments on Main - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Apartments on Main - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Arbors - S Sioux City, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,753 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 350 |  |
Buildings & Improvements |  |  |  | 6,625 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,119 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 985 |  |
Buildings & Improvements |  |  |  | 8,109 |  |
Total | $ 9,094 |  |  | 9,094 |  |
Accumulated Depreciation | $ (2,432) |  |  | (2,432) |  |
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 | $ 9,094 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,432 |  |  |  |  |
Multi-Family Residential [Member] | Arcata - Golden Valley, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 23,321 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,088 |  |
Buildings & Improvements |  |  |  | 30,613 |  |
Costs capitalized subsequent to acquisition |  |  |  | 58 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,089 |  |
Buildings & Improvements |  |  |  | 30,670 |  |
Total | 32,759 |  |  | 32,759 |  |
Accumulated Depreciation | $ (1,438) |  |  | (1,438) |  |
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 | $ 32,759 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,438 |  |  |  |  |
Multi-Family Residential [Member] | Ashland - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,414 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 741 |  |
Buildings & Improvements |  |  |  | 7,569 |  |
Costs capitalized subsequent to acquisition |  |  |  | 202 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 783 |  |
Buildings & Improvements |  |  |  | 7,729 |  |
Total | 8,512 |  |  | 8,512 |  |
Accumulated Depreciation | $ (902) |  |  | (902) |  |
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 | $ 8,512 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 902 |  |  |  |  |
Multi-Family Residential [Member] | Avalon Cove - Rochester, MN |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 25,900 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,616 |  |
Buildings & Improvements |  |  |  | 34,074 |  |
Costs capitalized subsequent to acquisition |  |  |  | 9 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,616 |  |
Buildings & Improvements |  |  |  | 34,083 |  |
Total | 35,699 |  |  | 35,699 |  |
Accumulated Depreciation | $ (109) |  |  | (109) |  |
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 | $ 35,699 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 109 |  |  |  |  |
Multi-Family Residential [Member] | Boulder Court - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,468 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,067 |  |
Buildings & Improvements |  |  |  | 5,498 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,008 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,391 |  |
Buildings & Improvements |  |  |  | 8,182 |  |
Total | 9,573 |  |  | 9,573 |  |
Accumulated Depreciation | $ (2,713) |  |  | (2,713) |  |
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 | $ 9,573 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,713 |  |  |  |  |
Multi-Family Residential [Member] | Brookfield Village - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,124 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 509 |  |
Buildings & Improvements |  |  |  | 6,698 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,618 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 773 |  |
Buildings & Improvements |  |  |  | 8,052 |  |
Total | 8,825 |  |  | 8,825 |  |
Accumulated Depreciation | $ (2,531) |  |  | (2,531) |  |
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 | $ 8,825 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,531 |  |  |  |  |
Multi-Family Residential [Member] | Brooklyn Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 636 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 145 |  |
Buildings & Improvements |  |  |  | 1,450 |  |
Costs capitalized subsequent to acquisition |  |  |  | 979 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 235 |  |
Buildings & Improvements |  |  |  | 2,339 |  |
Total | 2,574 |  |  | 2,574 |  |
Accumulated Depreciation | $ (1,012) |  |  | (1,012) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,574 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,012 |  |  |  |  |
Multi-Family Residential [Member] | Brooklyn Heights - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 12 years |  |  |  |  |
Multi-Family Residential [Member] | Brooklyn Heights - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Canyon Lake - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,791 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 305 |  |
Buildings & Improvements |  |  |  | 3,958 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,748 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 397 |  |
Buildings & Improvements |  |  |  | 5,614 |  |
Total | $ 6,011 |  |  | 6,011 |  |
Accumulated Depreciation | $ (1,943) |  |  | (1,943) |  |
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 | $ 6,011 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,943 |  |  |  |  |
Multi-Family Residential [Member] | Cardinal Point - Grand Forks, ND |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,600 |  |
Buildings & Improvements |  |  |  | 47,334 |  |
Costs capitalized subsequent to acquisition |  |  |  | 838 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,600 |  |
Buildings & Improvements |  |  |  | 48,172 |  |
Total | 49,772 |  |  | 49,772 |  |
Accumulated Depreciation | $ (587) |  |  | (587) |  |
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 | $ 49,772 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 587 |  |  |  |  |
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 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,585 |  |
Buildings & Improvements |  |  |  | 16,710 |  |
Total | 18,295 |  |  | 18,295 |  |
Accumulated Depreciation | $ (149) |  |  | (149) |  |
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 | $ 18,295 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 149 |  |  |  |  |
Multi-Family Residential [Member] | Castlerock - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 6,465 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 736 |  |
Buildings & Improvements |  |  |  | 4,864 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,281 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,011 |  |
Buildings & Improvements |  |  |  | 6,870 |  |
Total | 7,881 |  |  | 7,881 |  |
Accumulated Depreciation | $ (2,963) |  |  | (2,963) |  |
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 | $ 7,881 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,963 |  |  |  |  |
Multi-Family Residential [Member] | Chateau I & II - Minot, ND |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 301 |  |
Buildings & Improvements |  |  |  | 20,065 |  |
Costs capitalized subsequent to acquisition |  |  |  | 760 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 317 |  |
Buildings & Improvements |  |  |  | 20,809 |  |
Total | 21,126 |  |  | 21,126 |  |
Accumulated Depreciation | $ (1,364) |  |  | (1,364) |  |
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 | $ 21,126 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,364 |  |  |  |  |
Multi-Family Residential [Member] | Cimarron Hills - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,648 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 706 |  |
Buildings & Improvements |  |  |  | 9,588 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,466 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,376 |  |
Buildings & Improvements |  |  |  | 13,384 |  |
Total | 14,760 |  |  | 14,760 |  |
Accumulated Depreciation | $ (5,139) |  |  | (5,139) |  |
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 | $ 14,760 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,139 |  |  |  |  |
Multi-Family Residential [Member] | Colonial Villa - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,937 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,401 |  |
Buildings & Improvements |  |  |  | 11,515 |  |
Costs capitalized subsequent to acquisition |  |  |  | 8,191 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,878 |  |
Buildings & Improvements |  |  |  | 19,229 |  |
Total | 22,107 |  |  | 22,107 |  |
Accumulated Depreciation | $ (5,958) |  |  | (5,958) |  |
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 | $ 22,107 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,958 |  |  |  |  |
Multi-Family Residential [Member] | Colony - Lincoln, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 13,032 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,515 |  |
Buildings & Improvements |  |  |  | 15,730 |  |
Costs capitalized subsequent to acquisition |  |  |  | 941 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,609 |  |
Buildings & Improvements |  |  |  | 16,577 |  |
Total | 18,186 |  |  | 18,186 |  |
Accumulated Depreciation | $ (1,826) |  |  | (1,826) |  |
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 | $ 18,186 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,826 |  |  |  |  |
Multi-Family Residential [Member] | Colton Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 358 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 80 |  |
Buildings & Improvements |  |  |  | 672 |  |
Costs capitalized subsequent to acquisition |  |  |  | 441 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 123 |  |
Buildings & Improvements |  |  |  | 1,070 |  |
Total | 1,193 |  |  | 1,193 |  |
Accumulated Depreciation | $ (808) |  |  | (808) |  |
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 | $ 1,193 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 808 |  |  |  |  |
Multi-Family Residential [Member] | Commons at Southgate - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 21,760 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,691 |  |
Buildings & Improvements |  |  |  | 32,572 |  |
Costs capitalized subsequent to acquisition |  |  |  | 360 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,796 |  |
Buildings & Improvements |  |  |  | 32,827 |  |
Total | 36,623 |  |  | 36,623 |  |
Accumulated Depreciation | $ (1,914) |  |  | (1,914) |  |
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 | $ 36,623 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,914 |  |  |  |  |
Multi-Family Residential [Member] | Cottage West Twin Homes - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,523 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 968 |  |
Buildings & Improvements |  |  |  | 3,762 |  |
Costs capitalized subsequent to acquisition |  |  |  | 495 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,041 |  |
Buildings & Improvements |  |  |  | 4,184 |  |
Total | 5,225 |  |  | 5,225 |  |
Accumulated Depreciation | $ (496) |  |  | (496) |  |
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 | $ 5,225 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 496 |  |  |  |  |
Multi-Family Residential [Member] | Cottonwood - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 15,358 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,056 |  |
Buildings & Improvements |  |  |  | 17,372 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,851 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,460 |  |
Buildings & Improvements |  |  |  | 20,819 |  |
Total | 22,279 |  |  | 22,279 |  |
Accumulated Depreciation | $ (7,469) |  |  | (7,469) |  |
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 | $ 22,279 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,469 |  |  |  |  |
Multi-Family Residential [Member] | Country Meadows - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 6,436 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 491 |  |
Buildings & Improvements |  |  |  | 7,809 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,653 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 543 |  |
Buildings & Improvements |  |  |  | 9,410 |  |
Total | 9,953 |  |  | 9,953 |  |
Accumulated Depreciation | $ (4,086) |  |  | (4,086) |  |
Date of Construction or Acquisition | 1995 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 9,953 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,086 |  |  |  |  |
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 |  |  |  | 3,757 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 235 |  |
Buildings & Improvements |  |  |  | 4,290 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,853 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 536 |  |
Buildings & Improvements |  |  |  | 5,842 |  |
Total | $ 6,378 |  |  | 6,378 |  |
Accumulated Depreciation | $ (3,081) |  |  | (3,081) |  |
Date of Construction or Acquisition | 1994 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,378 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,081 |  |  |  |  |
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 |  |  |  | 2,509 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 261 |  |
Buildings & Improvements |  |  |  | 3,289 |  |
Costs capitalized subsequent to acquisition |  |  |  | 275 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 269 |  |
Buildings & Improvements |  |  |  | 3,556 |  |
Total | $ 3,825 |  |  | 3,825 |  |
Accumulated Depreciation | $ (575) |  |  | (575) |  |
Date of Construction or Acquisition | 2010 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,825 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 575 |  |  |  |  |
Multi-Family Residential [Member] | Crown Colony - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,936 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 620 |  |
Buildings & Improvements |  |  |  | 9,956 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,630 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 954 |  |
Buildings & Improvements |  |  |  | 12,252 |  |
Total | 13,206 |  |  | 13,206 |  |
Accumulated Depreciation | $ (4,868) |  |  | (4,868) |  |
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 | $ 13,206 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,868 |  |  |  |  |
Multi-Family Residential [Member] | Crystal Bay - Rochester, MN |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 8,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 433 |  |
Buildings & Improvements |  |  |  | 11,425 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 433 |  |
Buildings & Improvements |  |  |  | 11,425 |  |
Total | 11,858 |  |  | 11,858 |  |
Accumulated Depreciation | $ (54) |  |  | (54) |  |
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 | $ 11,858 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 54 |  |  |  |  |
Multi-Family Residential [Member] | Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 12,922 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,583 |  |
Buildings & Improvements |  |  |  | 18,879 |  |
Costs capitalized subsequent to acquisition |  |  |  | 162 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,591 |  |
Buildings & Improvements |  |  |  | 19,033 |  |
Total | 20,624 |  |  | 20,624 |  |
Accumulated Depreciation | $ (1,280) |  |  | (1,280) |  |
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 | $ 20,624 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,280 |  |  |  |  |
Multi-Family Residential [Member] | Dakota Commons - Williston, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 823 |  |
Buildings & Improvements |  |  |  | 9,597 |  |
Costs capitalized subsequent to acquisition |  |  |  | 97 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 871 |  |
Buildings & Improvements |  |  |  | 9,646 |  |
Total | 10,517 |  |  | 10,517 |  |
Accumulated Depreciation | $ (571) |  |  | (571) |  |
Date of Construction or Acquisition | 2015 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 10,517 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 571 |  |  |  |  |
Multi-Family Residential [Member] | 163 unit - Deer Ridge - Jamestown, ND |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 11,673 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 711 |  |
Buildings & Improvements |  |  |  | 24,117 |  |
Costs capitalized subsequent to acquisition |  |  |  | 69 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 711 |  |
Buildings & Improvements |  |  |  | 24,186 |  |
Total | 24,897 |  |  | 24,897 |  |
Accumulated Depreciation | $ (440) |  |  | (440) |  |
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 | $ 24,897 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 440 |  |  |  |  |
Multi-Family Residential [Member] | Evergreen - Isanti, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,951 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 380 |  |
Buildings & Improvements |  |  |  | 2,740 |  |
Costs capitalized subsequent to acquisition |  |  |  | 142 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 385 |  |
Buildings & Improvements |  |  |  | 2,877 |  |
Total | 3,262 |  |  | 3,262 |  |
Accumulated Depreciation | $ (552) |  |  | (552) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,262 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 552 |  |  |  |  |
Multi-Family Residential [Member] | Evergreen II - Isanti, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,020 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 691 |  |
Buildings & Improvements |  |  |  | 2,784 |  |
Costs capitalized subsequent to acquisition |  |  |  | 92 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 698 |  |
Buildings & Improvements |  |  |  | 2,869 |  |
Total | 3,567 |  |  | 3,567 |  |
Accumulated Depreciation | $ (361) |  |  | (361) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,567 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 361 |  |  |  |  |
Multi-Family Residential [Member] | Fairmont - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 319 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 28 |  |
Buildings & Improvements |  |  |  | 337 |  |
Costs capitalized subsequent to acquisition |  |  |  | 116 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 56 |  |
Buildings & Improvements |  |  |  | 425 |  |
Total | 481 |  |  | 481 |  |
Accumulated Depreciation | $ (93) |  |  | (93) |  |
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 | $ 481 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 93 |  |  |  |  |
Multi-Family Residential [Member] | First Avenue - Minot ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 3,046 |  |
Costs capitalized subsequent to acquisition |  |  |  | 21 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 3,067 |  |
Total | 3,067 |  |  | 3,067 |  |
Accumulated Depreciation | $ (234) |  |  | (234) |  |
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 | $ 3,067 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 234 |  |  |  |  |
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,422 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 810 |  |
Buildings & Improvements |  |  |  | 5,579 |  |
Costs capitalized subsequent to acquisition |  |  |  | 7,746 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,439 |  |
Buildings & Improvements |  |  |  | 12,696 |  |
Total | 14,135 |  |  | 14,135 |  |
Accumulated Depreciation | $ (5,776) |  |  | (5,776) |  |
Date of Construction or Acquisition | 1993 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 14,135 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,776 |  |  |  |  |
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 |  |  |  | 3,100 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 201 |  |
Buildings & Improvements |  |  |  | 4,735 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 201 |  |
Buildings & Improvements |  |  |  | 4,735 |  |
Total | $ 4,936 |  |  | 4,936 |  |
Accumulated Depreciation | $ (28) |  |  | (28) |  |
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 | $ 4,936 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 28 |  |  |  |  |
Multi-Family Residential [Member] | Gables Townhomes - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,426 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 349 |  |
Buildings & Improvements |  |  |  | 1,921 |  |
Costs capitalized subsequent to acquisition |  |  |  | 193 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 377 |  |
Buildings & Improvements |  |  |  | 2,086 |  |
Total | 2,463 |  |  | 2,463 |  |
Accumulated Depreciation | $ (246) |  |  | (246) |  |
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 | $ 2,463 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 246 |  |  |  |  |
Multi-Family Residential [Member] | Gardens - Grand Forks, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 518 |  |
Buildings & Improvements |  |  |  | 8,702 |  |
Costs capitalized subsequent to acquisition |  |  |  | 71 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 519 |  |
Buildings & Improvements |  |  |  | 8,772 |  |
Total | 9,291 |  |  | 9,291 |  |
Accumulated Depreciation | $ (155) |  |  | (155) |  |
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 | $ 9,291 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 155 |  |  |  |  |
Multi-Family Residential [Member] | Grand Gateway - St. Cloud, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 814 |  |
Buildings & Improvements |  |  |  | 7,086 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,119 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 935 |  |
Buildings & Improvements |  |  |  | 8,084 |  |
Total | 9,019 |  |  | 9,019 |  |
Accumulated Depreciation | $ (1,027) |  |  | (1,027) |  |
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 | $ 9,019 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,027 |  |  |  |  |
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 |  |  |  | 220 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 5,027 |  |
Buildings & Improvements |  |  |  | 50,559 |  |
Total | 55,586 |  |  | 55,586 |  |
Accumulated Depreciation | $ (673) |  |  | (673) |  |
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 | $ 55,586 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 673 |  |  |  |  |
Multi-Family Residential [Member] | Greenfield - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,503 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 578 |  |
Buildings & Improvements |  |  |  | 4,122 |  |
Costs capitalized subsequent to acquisition |  |  |  | 935 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 824 |  |
Buildings & Improvements |  |  |  | 4,811 |  |
Total | 5,635 |  |  | 5,635 |  |
Accumulated Depreciation | $ (1,092) |  |  | (1,092) |  |
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 | $ 5,635 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,092 |  |  |  |  |
Multi-Family Residential [Member] | Heritage Manor - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,731 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 403 |  |
Buildings & Improvements |  |  |  | 6,968 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,915 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 582 |  |
Buildings & Improvements |  |  |  | 9,704 |  |
Total | 10,286 |  |  | 10,286 |  |
Accumulated Depreciation | $ (4,039) |  |  | (4,039) |  |
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 | $ 10,286 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,039 |  |  |  |  |
Multi-Family Residential [Member] | Homestead Garden - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 9,585 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 655 |  |
Buildings & Improvements |  |  |  | 14,139 |  |
Costs capitalized subsequent to acquisition |  |  |  | 282 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 694 |  |
Buildings & Improvements |  |  |  | 14,382 |  |
Total | 15,076 |  |  | 15,076 |  |
Accumulated Depreciation | $ (737) |  |  | (737) |  |
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 | $ 15,076 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 737 |  |  |  |  |
Multi-Family Residential [Member] | Indian Hills - Sioux City, IA [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 294 |  |
Buildings & Improvements |  |  |  | 2,921 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,933 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 410 |  |
Buildings & Improvements |  |  |  | 6,738 |  |
Total | 7,148 |  |  | 7,148 |  |
Accumulated Depreciation | $ (1,574) |  |  | (1,574) |  |
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 | $ 7,148 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,574 |  |  |  |  |
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,204 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 449 |  |
Buildings & Improvements |  |  |  | 2,725 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,767 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 577 |  |
Buildings & Improvements |  |  |  | 4,364 |  |
Total | 4,941 |  |  | 4,941 |  |
Accumulated Depreciation | $ (1,907) |  |  | (1,907) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 4,941 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,907 |  |  |  |  |
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 |  |  |  | 12,867 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,215 |  |
Buildings & Improvements |  |  |  | 15,837 |  |
Costs capitalized subsequent to acquisition |  |  |  | 620 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,280 |  |
Buildings & Improvements |  |  |  | 16,392 |  |
Total | $ 17,672 |  |  | 17,672 |  |
Accumulated Depreciation | $ (1,785) |  |  | (1,785) |  |
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 | $ 17,672 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,785 |  |  |  |  |
Multi-Family Residential [Member] | Landing at Southgate - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 10,240 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,254 |  |
Buildings & Improvements |  |  |  | 14,958 |  |
Costs capitalized subsequent to acquisition |  |  |  | 187 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,319 |  |
Buildings & Improvements |  |  |  | 15,080 |  |
Total | 17,399 |  |  | 17,399 |  |
Accumulated Depreciation | $ (916) |  |  | (916) |  |
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 | $ 17,399 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 916 |  |  |  |  |
Multi-Family Residential [Member] | Landmark - Grand Forks, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 184 |  |
Buildings & Improvements |  |  |  | 1,514 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,154 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 353 |  |
Buildings & Improvements |  |  |  | 2,499 |  |
Total | 2,852 |  |  | 2,852 |  |
Accumulated Depreciation | $ (1,150) |  |  | (1,150) |  |
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 | $ 2,852 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,150 |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 15,151 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,362 |  |
Buildings & Improvements |  |  |  | 21,727 |  |
Costs capitalized subsequent to acquisition |  |  |  | 7,505 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,227 |  |
Buildings & Improvements |  |  |  | 28,367 |  |
Total | 30,594 |  |  | 30,594 |  |
Accumulated Depreciation | (11,020) |  |  | (11,020) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 30,594 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 11,020 |  |  |  |  |
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] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,207 |  |
Buildings & Improvements |  |  |  | 13,742 |  |
Costs capitalized subsequent to acquisition |  |  |  | 225 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,229 |  |
Buildings & Improvements |  |  |  | 13,945 |  |
Total | $ 15,174 |  |  | 15,174 |  |
Accumulated Depreciation | $ (412) |  |  | (412) |  |
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 | $ 15,174 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 412 |  |  |  |  |
Multi-Family Residential [Member] | Mariposa - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,872 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 399 |  |
Buildings & Improvements |  |  |  | 5,110 |  |
Costs capitalized subsequent to acquisition |  |  |  | 565 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 428 |  |
Buildings & Improvements |  |  |  | 5,646 |  |
Total | 6,074 |  |  | 6,074 |  |
Accumulated Depreciation | $ (1,627) |  |  | (1,627) |  |
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 | $ 6,074 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,627 |  |  |  |  |
Multi-Family Residential [Member] | Meadows - Jamestown, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 590 |  |
Buildings & Improvements |  |  |  | 4,519 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,520 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 678 |  |
Buildings & Improvements |  |  |  | 5,951 |  |
Total | 6,629 |  |  | 6,629 |  |
Accumulated Depreciation | $ (2,297) |  |  | (2,297) |  |
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 | $ 6,629 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,297 |  |  |  |  |
Multi-Family Residential [Member] | Monticello Village - Monticello, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,901 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 490 |  |
Buildings & Improvements |  |  |  | 3,756 |  |
Costs capitalized subsequent to acquisition |  |  |  | 603 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 625 |  |
Buildings & Improvements |  |  |  | 4,224 |  |
Total | 4,849 |  |  | 4,849 |  |
Accumulated Depreciation | $ (1,371) |  |  | (1,371) |  |
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 | $ 4,849 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,371 |  |  |  |  |
Multi-Family Residential [Member] | Northern Valley - Rochester, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 110 |  |
Buildings & Improvements |  |  |  | 610 |  |
Costs capitalized subsequent to acquisition |  |  |  | 140 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 122 |  |
Buildings & Improvements |  |  |  | 738 |  |
Total | 860 |  |  | 860 |  |
Accumulated Depreciation | $ (126) |  |  | (126) |  |
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 | $ 860 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 126 |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,330 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 303 |  |
Buildings & Improvements |  |  |  | 3,957 |  |
Costs capitalized subsequent to acquisition |  |  |  | 808 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 357 |  |
Buildings & Improvements |  |  |  | 4,711 |  |
Total | 5,068 |  |  | 5,068 |  |
Accumulated Depreciation | (1,579) |  |  | (1,579) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 5,068 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,579 |  |  |  |  |
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 |  |  |  | 6,146 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 884 |  |
Buildings & Improvements |  |  |  | 7,516 |  |
Costs capitalized subsequent to acquisition |  |  |  | 96 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 946 |  |
Buildings & Improvements |  |  |  | 7,550 |  |
Total | $ 8,496 |  |  | 8,496 |  |
Accumulated Depreciation | $ (334) |  |  | (334) |  |
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 | $ 8,496 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 334 |  |  |  |  |
Multi-Family Residential [Member] | Oakmont Estates - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,361 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 422 |  |
Buildings & Improvements |  |  |  | 4,838 |  |
Costs capitalized subsequent to acquisition |  |  |  | 721 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 639 |  |
Buildings & Improvements |  |  |  | 5,342 |  |
Total | 5,981 |  |  | 5,981 |  |
Accumulated Depreciation | $ (1,910) |  |  | (1,910) |  |
Date of Construction or Acquisition | 2002 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,981 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,910 |  |  |  |  |
Multi-Family Residential [Member] | Oakwood Estates - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,847 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 543 |  |
Buildings & Improvements |  |  |  | 2,784 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,470 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 837 |  |
Buildings & Improvements |  |  |  | 6,960 |  |
Total | 7,797 |  |  | 7,797 |  |
Accumulated Depreciation | $ (3,422) |  |  | (3,422) |  |
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 | $ 7,797 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,422 |  |  |  |  |
Multi-Family Residential [Member] | Olympic Village - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 10,372 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,164 |  |
Buildings & Improvements |  |  |  | 10,441 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,312 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,799 |  |
Buildings & Improvements |  |  |  | 13,118 |  |
Total | 14,917 |  |  | 14,917 |  |
Accumulated Depreciation | $ (5,266) |  |  | (5,266) |  |
Date of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 14,917 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,266 |  |  |  |  |
Multi-Family Residential [Member] | Olympik Village - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,259 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,034 |  |
Buildings & Improvements |  |  |  | 6,109 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,315 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,187 |  |
Buildings & Improvements |  |  |  | 8,271 |  |
Total | 9,458 |  |  | 9,458 |  |
Accumulated Depreciation | $ (2,346) |  |  | (2,346) |  |
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 | $ 9,458 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,346 |  |  |  |  |
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,757 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 404 |  |
Buildings & Improvements |  |  |  | 3,152 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,178 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 957 |  |
Buildings & Improvements |  |  |  | 5,777 |  |
Total | 6,734 |  |  | 6,734 |  |
Accumulated Depreciation | $ (2,987) |  |  | (2,987) |  |
Date of Construction or Acquisition | 1994 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 6,734 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,987 |  |  |  |  |
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 |  |  |  | 8,342 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,143 |  |
Buildings & Improvements |  |  |  | 9,099 |  |
Costs capitalized subsequent to acquisition |  |  |  | 7,594 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,766 |  |
Buildings & Improvements |  |  |  | 16,070 |  |
Total | $ 17,836 |  |  | 17,836 |  |
Accumulated Depreciation | $ (6,454) |  |  | (6,454) |  |
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 | $ 17,836 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,454 |  |  |  |  |
Multi-Family Residential [Member] | Pebble Springs - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 738 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 7 |  |
Buildings & Improvements |  |  |  | 748 |  |
Costs capitalized subsequent to acquisition |  |  |  | 182 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 55 |  |
Buildings & Improvements |  |  |  | 882 |  |
Total | 937 |  |  | 937 |  |
Accumulated Depreciation | $ (373) |  |  | (373) |  |
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 | $ 937 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 373 |  |  |  |  |
Multi-Family Residential [Member] | Pinehurst - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 164 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 72 |  |
Buildings & Improvements |  |  |  | 687 |  |
Costs capitalized subsequent to acquisition |  |  |  | 360 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 112 |  |
Buildings & Improvements |  |  |  | 1,007 |  |
Total | 1,119 |  |  | 1,119 |  |
Accumulated Depreciation | $ (332) |  |  | (332) |  |
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 | $ 1,119 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 332 |  |  |  |  |
Multi-Family Residential [Member] | Pines - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 102 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 35 |  |
Buildings & Improvements |  |  |  | 215 |  |
Costs capitalized subsequent to acquisition |  |  |  | 187 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 49 |  |
Buildings & Improvements |  |  |  | 388 |  |
Total | 437 |  |  | 437 |  |
Accumulated Depreciation | $ (148) |  |  | (148) |  |
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 | $ 437 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 148 |  |  |  |  |
Multi-Family Residential [Member] | Plaza - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,212 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 867 |  |
Buildings & Improvements |  |  |  | 12,784 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,617 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 998 |  |
Buildings & Improvements |  |  |  | 15,270 |  |
Total | 16,268 |  |  | 16,268 |  |
Accumulated Depreciation | $ (2,851) |  |  | (2,851) |  |
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 | $ 16,268 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,851 |  |  |  |  |
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,566 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 240 |  |
Buildings & Improvements |  |  |  | 3,538 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,674 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 388 |  |
Buildings & Improvements |  |  |  | 5,064 |  |
Total | 5,452 |  |  | 5,452 |  |
Accumulated Depreciation | $ (2,522) |  |  | (2,522) |  |
Date of Construction or Acquisition | 1994 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,452 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,522 |  |  |  |  |
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 |  |  |  | 3,749 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 395 |  |
Buildings & Improvements |  |  |  | 4,564 |  |
Costs capitalized subsequent to acquisition |  |  |  | 400 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 410 |  |
Buildings & Improvements |  |  |  | 4,949 |  |
Total | $ 5,359 |  |  | 5,359 |  |
Accumulated Depreciation | $ (517) |  |  | (517) |  |
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 | $ 5,359 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 517 |  |  |  |  |
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,381 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 144 |  |
Buildings & Improvements |  |  |  | 1,816 |  |
Costs capitalized subsequent to acquisition |  |  |  | 575 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 297 |  |
Buildings & Improvements |  |  |  | 2,238 |  |
Total | 2,535 |  |  | 2,535 |  |
Accumulated Depreciation | $ (1,296) |  |  | (1,296) |  |
Date of Construction or Acquisition | 1993 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,535 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,296 |  |  |  |  |
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 |  |  |  | 26,755 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,254 |  |
Buildings & Improvements |  |  |  | 30,024 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,690 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,363 |  |
Buildings & Improvements |  |  |  | 31,605 |  |
Total | $ 33,968 |  |  | 33,968 |  |
Accumulated Depreciation | $ (5,450) |  |  | (5,450) |  |
Date of Construction or Acquisition | 2006 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 33,968 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,450 |  |  |  |  |
Multi-Family Residential [Member] | RED 20 - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 23,200 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,900 |  |
Buildings & Improvements |  |  |  | 26,641 |  |
Costs capitalized subsequent to acquisition |  |  |  | 65 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,900 |  |
Buildings & Improvements |  |  |  | 26,706 |  |
Total | 28,606 |  |  | 28,606 |  |
Accumulated Depreciation | $ (1,349) |  |  | (1,349) |  |
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 | $ 28,606 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,349 |  |  |  |  |
Multi-Family Residential [Member] | Regency Park Estates - St. Cloud, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 8,368 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 702 |  |
Buildings & Improvements |  |  |  | 10,198 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,760 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 873 |  |
Buildings & Improvements |  |  |  | 11,787 |  |
Total | 12,660 |  |  | 12,660 |  |
Accumulated Depreciation | $ (1,539) |  |  | (1,539) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 12,660 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,539 |  |  |  |  |
Multi-Family Residential [Member] | 288 unit - Renaissance Heights - Williston, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 42,221 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,080 |  |
Buildings & Improvements |  |  |  | 59,434 |  |
Costs capitalized subsequent to acquisition |  |  |  | 286 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,089 |  |
Buildings & Improvements |  |  |  | 59,711 |  |
Total | 62,800 |  |  | 62,800 |  |
Accumulated Depreciation | $ (2,956) |  |  | (2,956) |  |
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 | $ 62,800 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,956 |  |  |  |  |
Multi-Family Residential [Member] | Ridge Oaks - Sioux City, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,301 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 178 |  |
Buildings & Improvements |  |  |  | 4,073 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,532 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 307 |  |
Buildings & Improvements |  |  |  | 6,476 |  |
Total | 6,783 |  |  | 6,783 |  |
Accumulated Depreciation | $ (2,394) |  |  | (2,394) |  |
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 | $ 6,783 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,394 |  |  |  |  |
Multi-Family Residential [Member] | Rimrock West - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,223 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 330 |  |
Buildings & Improvements |  |  |  | 3,489 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,706 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 447 |  |
Buildings & Improvements |  |  |  | 5,078 |  |
Total | 5,525 |  |  | 5,525 |  |
Accumulated Depreciation | $ (1,902) |  |  | (1,902) |  |
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 | $ 5,525 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,902 |  |  |  |  |
Multi-Family Residential [Member] | River Ridge - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 13,000 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 576 |  |
Buildings & Improvements |  |  |  | 24,695 |  |
Costs capitalized subsequent to acquisition |  |  |  | 435 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 662 |  |
Buildings & Improvements |  |  |  | 25,044 |  |
Total | 25,706 |  |  | 25,706 |  |
Accumulated Depreciation | $ (2,167) |  |  | (2,167) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 25,706 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,167 |  |  |  |  |
Multi-Family Residential [Member] | Rocky Meadows - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,997 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 656 |  |
Buildings & Improvements |  |  |  | 5,726 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,437 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 775 |  |
Buildings & Improvements |  |  |  | 7,044 |  |
Total | 7,819 |  |  | 7,819 |  |
Accumulated Depreciation | $ (3,316) |  |  | (3,316) |  |
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 | $ 7,819 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,316 |  |  |  |  |
Multi-Family Residential [Member] | Rum River - Isanti, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,461 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 843 |  |
Buildings & Improvements |  |  |  | 4,823 |  |
Costs capitalized subsequent to acquisition |  |  |  | 269 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 864 |  |
Buildings & Improvements |  |  |  | 5,071 |  |
Total | 5,935 |  |  | 5,935 |  |
Accumulated Depreciation | $ (1,164) |  |  | (1,164) |  |
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 | $ 5,935 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,164 |  |  |  |  |
Multi-Family Residential [Member] | Sherwood - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 11,918 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,142 |  |
Buildings & Improvements |  |  |  | 14,684 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,405 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,745 |  |
Buildings & Improvements |  |  |  | 17,486 |  |
Total | 19,231 |  |  | 19,231 |  |
Accumulated Depreciation | $ (7,099) |  |  | (7,099) |  |
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 | $ 19,231 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,099 |  |  |  |  |
Multi-Family Residential [Member] | Sierra Vista - Sioux Falls, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,358 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 241 |  |
Buildings & Improvements |  |  |  | 2,097 |  |
Costs capitalized subsequent to acquisition |  |  |  | 477 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 276 |  |
Buildings & Improvements |  |  |  | 2,539 |  |
Total | 2,815 |  |  | 2,815 |  |
Accumulated Depreciation | $ (350) |  |  | (350) |  |
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 | $ 2,815 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 350 |  |  |  |  |
Multi-Family Residential [Member] | Silver Springs - Rapid City, SD [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,194 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 215 |  |
Buildings & Improvements |  |  |  | 3,006 |  |
Costs capitalized subsequent to acquisition |  |  |  | 351 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 237 |  |
Buildings & Improvements |  |  |  | 3,335 |  |
Total | 3,572 |  |  | 3,572 |  |
Accumulated Depreciation | $ (161) |  |  | (161) |  |
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 | $ 3,572 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 161 |  |  |  |  |
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 8,428 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 550 |  |
Buildings & Improvements |  |  |  | 9,548 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,836 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,362 |  |
Buildings & Improvements |  |  |  | 12,572 |  |
Total | 13,934 |  |  | 13,934 |  |
Accumulated Depreciation | $ (5,881) |  |  | (5,881) |  |
Date of Construction or Acquisition | 1995 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 13,934 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,881 |  |  |  |  |
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] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 576 |  |
Buildings & Improvements |  |  |  | 9,893 |  |
Costs capitalized subsequent to acquisition |  |  |  | 95 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 605 |  |
Buildings & Improvements |  |  |  | 9,959 |  |
Total | $ 10,564 |  |  | 10,564 |  |
Accumulated Depreciation | $ (672) |  |  | (672) |  |
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 | $ 10,564 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 672 |  |  |  |  |
Multi-Family Residential [Member] | Southview - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,009 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 185 |  |
Buildings & Improvements |  |  |  | 469 |  |
Costs capitalized subsequent to acquisition |  |  |  | 435 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 251 |  |
Buildings & Improvements |  |  |  | 838 |  |
Total | 1,089 |  |  | 1,089 |  |
Accumulated Depreciation | $ (401) |  |  | (401) |  |
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 | $ 1,089 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 401 |  |  |  |  |
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,385 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 400 |  |
Buildings & Improvements |  |  |  | 5,034 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,290 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 796 |  |
Buildings & Improvements |  |  |  | 7,928 |  |
Total | 8,724 |  |  | 8,724 |  |
Accumulated Depreciation | $ (3,754) |  |  | (3,754) |  |
Date of Construction or Acquisition | 1995 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 8,724 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,754 |  |  |  |  |
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Summit Park - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 882 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 161 |  |
Buildings & Improvements |  |  |  | 1,898 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,847 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 795 |  |
Buildings & Improvements |  |  |  | 3,111 |  |
Total | $ 3,906 |  |  | 3,906 |  |
Accumulated Depreciation | $ (1,347) |  |  | (1,347) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 3,906 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 1,347 |  |  |  |  |
Multi-Family Residential [Member] | Summit Park - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |
Multi-Family Residential [Member] | Summit Park - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Multi-Family Residential [Member] | Sunset Trail - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,875 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 336 |  |
Buildings & Improvements |  |  |  | 12,814 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,926 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 662 |  |
Buildings & Improvements |  |  |  | 15,414 |  |
Total | $ 16,076 |  |  | 16,076 |  |
Accumulated Depreciation | $ (5,937) |  |  | (5,937) |  |
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 | $ 16,076 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 5,937 |  |  |  |  |
Multi-Family Residential [Member] | Temple - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 72 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 234 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 234 |  |
Total | 234 |  |  | 234 |  |
Accumulated Depreciation | $ (64) |  |  | (64) |  |
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 | $ 234 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 64 |  |  |  |  |
Multi-Family Residential [Member] | Terrace Heights - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 147 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 29 |  |
Buildings & Improvements |  |  |  | 312 |  |
Costs capitalized subsequent to acquisition |  |  |  | 148 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 40 |  |
Buildings & Improvements |  |  |  | 449 |  |
Total | 489 |  |  | 489 |  |
Accumulated Depreciation | $ (184) |  |  | (184) |  |
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 | $ 489 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 184 |  |  |  |  |
Multi-Family Residential [Member] | Thomasbrook - Lincoln, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,793 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 600 |  |
Buildings & Improvements |  |  |  | 10,306 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,578 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,421 |  |
Buildings & Improvements |  |  |  | 13,063 |  |
Total | 14,484 |  |  | 14,484 |  |
Accumulated Depreciation | $ (4,967) |  |  | (4,967) |  |
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 | $ 14,484 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,967 |  |  |  |  |
Multi-Family Residential [Member] | Valley Park - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 3,755 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 294 |  |
Buildings & Improvements |  |  |  | 4,137 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,667 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,177 |  |
Buildings & Improvements |  |  |  | 6,921 |  |
Total | 8,098 |  |  | 8,098 |  |
Accumulated Depreciation | $ (2,827) |  |  | (2,827) |  |
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 | $ 8,098 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,827 |  |  |  |  |
Multi-Family Residential [Member] | Villa West - Topeka, KS [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 11,923 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,590 |  |
Buildings & Improvements |  |  |  | 15,760 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,152 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,942 |  |
Buildings & Improvements |  |  |  | 16,560 |  |
Total | 18,502 |  |  | 18,502 |  |
Accumulated Depreciation | $ (1,839) |  |  | (1,839) |  |
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 | $ 18,502 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,839 |  |  |  |  |
Multi-Family Residential [Member] | Village Green - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 945 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 234 |  |
Buildings & Improvements |  |  |  | 2,296 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,009 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 359 |  |
Buildings & Improvements |  |  |  | 3,180 |  |
Total | 3,539 |  |  | 3,539 |  |
Accumulated Depreciation | $ (1,011) |  |  | (1,011) |  |
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 | $ 3,539 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,011 |  |  |  |  |
Multi-Family Residential [Member] | West Stonehill - Waite Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 8,267 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 939 |  |
Buildings & Improvements |  |  |  | 10,167 |  |
Costs capitalized subsequent to acquisition |  |  |  | 6,436 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,673 |  |
Buildings & Improvements |  |  |  | 15,869 |  |
Total | 17,542 |  |  | 17,542 |  |
Accumulated Depreciation | $ (7,323) |  |  | (7,323) |  |
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 | $ 17,542 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,323 |  |  |  |  |
Multi-Family Residential [Member] | Westridge - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,543 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 68 |  |
Buildings & Improvements |  |  |  | 1,887 |  |
Costs capitalized subsequent to acquisition |  |  |  | 309 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 79 |  |
Buildings & Improvements |  |  |  | 2,185 |  |
Total | 2,264 |  |  | 2,264 |  |
Accumulated Depreciation | $ (454) |  |  | (454) |  |
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 | $ 2,264 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 454 |  |  |  |  |
Multi-Family Residential [Member] | Westwood Park - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,916 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 116 |  |
Buildings & Improvements |  |  |  | 1,909 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,975 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 284 |  |
Buildings & Improvements |  |  |  | 3,716 |  |
Total | 4,000 |  |  | 4,000 |  |
Accumulated Depreciation | $ (1,546) |  |  | (1,546) |  |
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 | $ 4,000 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,546 |  |  |  |  |
Multi-Family Residential [Member] | Whispering Ridge - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 21,653 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,139 |  |
Buildings & Improvements |  |  |  | 25,424 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,025 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,316 |  |
Buildings & Improvements |  |  |  | 26,272 |  |
Total | 28,588 |  |  | 28,588 |  |
Accumulated Depreciation | $ (2,349) |  |  | (2,349) |  |
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 | $ 28,588 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,349 |  |  |  |  |
Multi-Family Residential [Member] | Williston Garden - Williston, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 10,070 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,400 |  |
Buildings & Improvements |  |  |  | 17,696 |  |
Costs capitalized subsequent to acquisition |  |  |  | 215 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,431 |  |
Buildings & Improvements |  |  |  | 17,880 |  |
Total | 19,311 |  |  | 19,311 |  |
Accumulated Depreciation | $ (2,853) |  |  | (2,853) |  |
Date of Construction or Acquisition | 2012 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 19,311 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,853 |  |  |  |  |
Multi-Family Residential [Member] | Winchester - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,313 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 748 |  |
Buildings & Improvements |  |  |  | 5,622 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,877 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,016 |  |
Buildings & Improvements |  |  |  | 7,231 |  |
Total | 8,247 |  |  | 8,247 |  |
Accumulated Depreciation | $ (2,457) |  |  | (2,457) |  |
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 | $ 8,247 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,457 |  |  |  |  |
Multi-Family Residential [Member] | Woodridge - Rochester, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 6,092 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 370 |  |
Buildings & Improvements |  |  |  | 6,028 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,388 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 741 |  |
Buildings & Improvements |  |  |  | 8,045 |  |
Total | 8,786 |  |  | 8,786 |  |
Accumulated Depreciation | $ (3,810) |  |  | (3,810) |  |
Date of Construction or Acquisition | 1997 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 8,786 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,810 |  |  |  |  |
Multi-Family Residential [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Additions | 282,457 | 183,114 | $ 84,117 |  |  |
Commercial Healthcare [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 171,332 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 24,479 |  |
Buildings & Improvements |  |  |  | 264,856 |  |
Costs capitalized subsequent to acquisition |  |  |  | 48,585 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 25,262 |  |
Buildings & Improvements |  |  |  | 312,658 |  |
Total | 337,920 |  |  | 337,920 |  |
Accumulated Depreciation | (83,558) |  |  | (83,558) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 337,920 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 83,558 |  |  |  |  |
Commercial Healthcare [Member] | 2800 Medical Building - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,552 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 204 |  |
Buildings & Improvements |  |  |  | 7,135 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,547 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 229 |  |
Buildings & Improvements |  |  |  | 9,657 |  |
Total | 9,886 |  |  | 9,886 |  |
Accumulated Depreciation | $ (3,386) |  |  | (3,386) |  |
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 | $ 9,886 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,386 |  |  |  |  |
Commercial Healthcare [Member] | 2828 Chicago Avenue - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 11,813 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 726 |  |
Buildings & Improvements |  |  |  | 11,319 |  |
Costs capitalized subsequent to acquisition |  |  |  | 5,280 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 729 |  |
Buildings & Improvements |  |  |  | 16,596 |  |
Total | 17,325 |  |  | 17,325 |  |
Accumulated Depreciation | $ (4,614) |  |  | (4,614) |  |
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 | $ 17,325 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,614 |  |  |  |  |
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 | $ (1,848) |  |  | (1,848) |  |
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 | 1,848 |  |  |  |  |
Commercial Healthcare [Member] | Billings 2300 Grant Road - Billings, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 980 |  |
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 | $ (176) |  |  | (176) |  |
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 | 176 |  |  |  |  |
Commercial Healthcare [Member] | Burnsville 303 Nicollet Medical (Ridgeview) - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,903 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,071 |  |
Buildings & Improvements |  |  |  | 6,842 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,137 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,160 |  |
Buildings & Improvements |  |  |  | 8,890 |  |
Total | 10,050 |  |  | 10,050 |  |
Accumulated Depreciation | $ (1,904) |  |  | (1,904) |  |
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 | $ 10,050 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,904 |  |  |  |  |
Commercial Healthcare [Member] | Burnsville 305 Nicollet Medical (Ridgeview South) - Burnsville, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,947 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 189 |  |
Buildings & Improvements |  |  |  | 5,127 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,221 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 248 |  |
Buildings & Improvements |  |  |  | 6,289 |  |
Total | 6,537 |  |  | 6,537 |  |
Accumulated Depreciation | $ (1,261) |  |  | (1,261) |  |
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 | $ 6,537 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,261 |  |  |  |  |
Commercial Healthcare [Member] | Denfeld Clinic - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,308 |  |
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 | $ (783) |  |  | (783) |  |
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 | 783 |  |  |  |  |
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 | $ (730) |  |  | (730) |  |
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 | 730 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6363 France Medical - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 11,228 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 12,675 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,319 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 15,994 |  |
Total | 15,994 |  |  | 15,994 |  |
Accumulated Depreciation | $ (4,455) |  |  | (4,455) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 15,994 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,455 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6405 France Medical - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 8,568 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 12,201 |  |
Costs capitalized subsequent to acquisition |  |  |  | 257 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 12,458 |  |
Total | 12,458 |  |  | 12,458 |  |
Accumulated Depreciation | $ (3,407) |  |  | (3,407) |  |
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 | $ 12,458 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,407 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6517 Drew Avenue - Edina, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 353 |  |
Buildings & Improvements |  |  |  | 660 |  |
Costs capitalized subsequent to acquisition |  |  |  | 27 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 372 |  |
Buildings & Improvements |  |  |  | 668 |  |
Total | 1,040 |  |  | 1,040 |  |
Accumulated Depreciation | $ (239) |  |  | (239) |  |
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 | $ 1,040 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 239 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6525 Drew Avenue - Edina, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 388 |  |
Buildings & Improvements |  |  |  | 117 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 388 |  |
Buildings & Improvements |  |  |  | 117 |  |
Total | 505 |  |  | 505 |  |
Accumulated Depreciation | $ (13) |  |  | (13) |  |
Date of Construction or Acquisition | 2011 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 505 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 13 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6525 France SMC II - Edina, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 9,604 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 755 |  |
Buildings & Improvements |  |  |  | 8,054 |  |
Costs capitalized subsequent to acquisition |  |  |  | 6,156 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,040 |  |
Buildings & Improvements |  |  |  | 13,925 |  |
Total | 14,965 |  |  | 14,965 |  |
Accumulated Depreciation | $ (6,345) |  |  | (6,345) |  |
Date of Construction or Acquisition | 2003 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 14,965 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 6,345 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6545 France SMC I - Edina MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 28,993 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,480 |  |
Buildings & Improvements |  |  |  | 30,192 |  |
Costs capitalized subsequent to acquisition |  |  |  | 14,383 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,480 |  |
Buildings & Improvements |  |  |  | 44,575 |  |
Total | 48,055 |  |  | 48,055 |  |
Accumulated Depreciation | $ (18,379) |  |  | (18,379) |  |
Date of Construction or Acquisition | 2001 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 48,055 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 18,379 |  |  |  |  |
Commercial Healthcare [Member] | Edina 6565 France SMC III - Edina, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 33,032 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,201 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 34,233 |  |
Total | 34,233 |  |  | 34,233 |  |
Accumulated Depreciation | $ (701) |  |  | (701) |  |
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 | $ 34,233 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 701 |  |  |  |  |
Commercial Healthcare [Member] | Fresenius - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 500 |  |
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 | $ (458) |  |  | (458) |  |
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 | 458 |  |  |  |  |
Commercial Healthcare [Member] | Garden View - St. Paul, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 6,890 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 7,408 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,072 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 26 |  |
Buildings & Improvements |  |  |  | 8,454 |  |
Total | 8,480 |  |  | 8,480 |  |
Accumulated Depreciation | $ (3,001) |  |  | (3,001) |  |
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 | $ 8,480 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,001 |  |  |  |  |
Commercial Healthcare [Member] | Gateway Clinic - Sandstone, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 757 |  |
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 | $ (512) |  |  | (512) |  |
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 | 512 |  |  |  |  |
Commercial Healthcare [Member] | Healtheast St John & Woodwinds - Maplewood & Woodbury, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 5,654 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,239 |  |
Buildings & Improvements |  |  |  | 18,362 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 3,239 |  |
Buildings & Improvements |  |  |  | 18,362 |  |
Total | 21,601 |  |  | 21,601 |  |
Accumulated Depreciation | $ (7,326) |  |  | (7,326) |  |
Date of Construction or Acquisition | 2000 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 21,601 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 7,326 |  |  |  |  |
Commercial Healthcare [Member] | High Pointe Health Campus - Lake Elmo, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,500 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,305 |  |
Buildings & Improvements |  |  |  | 10,528 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,174 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,398 |  |
Buildings & Improvements |  |  |  | 12,609 |  |
Total | 14,007 |  |  | 14,007 |  |
Accumulated Depreciation | $ (4,226) |  |  | (4,226) |  |
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 | $ 14,007 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 4,226 |  |  |  |  |
Commercial Healthcare [Member] | Lakeside Medical Plaza - Omaha, NE [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,294 |  |
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 | $ (92) |  |  | (92) |  |
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 | 92 |  |  |  |  |
Commercial Healthcare [Member] | Mariner Clinic - Superior, WI |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,657 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 3,781 |  |
Costs capitalized subsequent to acquisition |  |  |  | 275 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 20 |  |
Buildings & Improvements |  |  |  | 4,036 |  |
Total | 4,056 |  |  | 4,056 |  |
Accumulated Depreciation | $ (1,182) |  |  | (1,182) |  |
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 | $ 4,056 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,182 |  |  |  |  |
Commercial Healthcare [Member] | Minneapolis 701 25th Avenue Medical - Minneapolis, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 7,016 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 7,873 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,566 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Buildings & Improvements |  |  |  | 9,439 |  |
Total | 9,439 |  |  | 9,439 |  |
Accumulated Depreciation | $ (2,205) |  |  | (2,205) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 9,439 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,205 |  |  |  |  |
Commercial Healthcare [Member] | Missoula 3050 Great Northern - Missoula, MT [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 997 |  |
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 | $ (193) |  |  | (193) |  |
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 | 193 |  |  |  |  |
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 | $ (943) |  |  | (943) |  |
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 | 943 |  |  |  |  |
Commercial Healthcare [Member] | Pavilion I - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,366 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,245 |  |
Buildings & Improvements |  |  |  | 8,898 |  |
Costs capitalized subsequent to acquisition |  |  |  | 31 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,245 |  |
Buildings & Improvements |  |  |  | 8,929 |  |
Total | 10,174 |  |  | 10,174 |  |
Accumulated Depreciation | $ (2,670) |  |  | (2,670) |  |
Date of Construction or Acquisition | 2004 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 10,174 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,670 |  |  |  |  |
Commercial Healthcare [Member] | Pavilion II - Duluth, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 8,034 |  |
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 | $ (6,306) |  |  | (6,306) |  |
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 | 6,306 |  |  |  |  |
Commercial Healthcare [Member] | PrairieCare Medical - Brooklyn Park, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 14,982 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,610 |  |
Buildings & Improvements |  |  |  | 21,798 |  |
Costs capitalized subsequent to acquisition |  |  |  | 32 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,610 |  |
Buildings & Improvements |  |  |  | 21,830 |  |
Total | 24,440 |  |  | 24,440 |  |
Accumulated Depreciation | $ (407) |  |  | (407) |  |
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 | $ 24,440 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 407 |  |  |  |  |
Commercial Healthcare [Member] | Ritchie Medical Plaza - St Paul, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 8,320 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,615 |  |
Buildings & Improvements |  |  |  | 7,851 |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,063 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,647 |  |
Buildings & Improvements |  |  |  | 11,882 |  |
Total | 13,529 |  |  | 13,529 |  |
Accumulated Depreciation | $ (3,422) |  |  | (3,422) |  |
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 | $ 13,529 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,422 |  |  |  |  |
Commercial Healthcare [Member] | St Michael Clinic - St Michael, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,736 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 328 |  |
Buildings & Improvements |  |  |  | 2,259 |  |
Costs capitalized subsequent to acquisition |  |  |  | 264 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 328 |  |
Buildings & Improvements |  |  |  | 2,523 |  |
Total | 2,851 |  |  | 2,851 |  |
Accumulated Depreciation | $ (573) |  |  | (573) |  |
Date of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,851 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 573 |  |  |  |  |
Commercial Healthcare [Member] | Trinity at Plaza 16 - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 4,577 |  |
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 | $ (1,049) |  |  | (1,049) |  |
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 | 1,049 |  |  |  |  |
Commercial Healthcare [Member] | Wells Clinic - Hibbing, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,156 |  |
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 | $ (752) |  |  | (752) |  |
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 | 752 |  |  |  |  |
Commercial Healthcare [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Additions | 63,605 |  |  |  |  |
Other Segments [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 22,313 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 13,004 |  |
Buildings & Improvements |  |  |  | 62,212 |  |
Costs capitalized subsequent to acquisition |  |  |  | 24,426 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 13,705 |  |
Buildings & Improvements |  |  |  | 85,937 |  |
Total | 99,642 |  |  | 99,642 |  |
Accumulated Depreciation | (20,175) |  |  | (20,175) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 99,642 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 20,175 |  |  |  |  |
Other Segments [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 | $ (49) |  |  | (49) |  |
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 | $ 49 |  |  |  |  |
Other Segments [Member] | 1st Avenue Building - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 33 years |  |  |  |  |
Other Segments [Member] | 1st Avenue Building - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Other Segments [Member] | 17 South Main - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 72 |  |
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 | $ (205) |  |  | (205) |  |
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 | 205 |  |  |  |  |
Other Segments [Member] | Bismarck 715 East Broadway - Bismarck, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 2,041 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 389 |  |
Buildings & Improvements |  |  |  | 1,283 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,126 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 443 |  |
Buildings & Improvements |  |  |  | 2,355 |  |
Total | 2,798 |  |  | 2,798 |  |
Accumulated Depreciation | $ (544) |  |  | (544) |  |
Date of Construction or Acquisition | 2008 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,798 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 544 |  |  |  |  |
Other Segments [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 |  |  |  | 1,243 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 2,230 |  |
Buildings & Improvements |  |  |  | 5,243 |  |
Total | 7,473 |  |  | 7,473 |  |
Accumulated Depreciation | $ (1,649) |  |  | (1,649) |  |
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 | $ 7,473 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,649 |  |  |  |  |
Other Segments [Member] | Dakota West Plaza - Minot , ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 338 |  |
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 | $ (135) |  |  | (135) |  |
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 | 135 |  |  |  |  |
Other Segments [Member] | Grand Forks Carmike - Grand Forks, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,176 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 184 |  |
Buildings & Improvements |  |  |  | 2,360 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 184 |  |
Buildings & Improvements |  |  |  | 2,362 |  |
Total | 2,546 |  |  | 2,546 |  |
Accumulated Depreciation | $ (1,270) |  |  | (1,270) |  |
Date of Construction or Acquisition | 1994 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 2,546 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,270 |  |  |  |  |
Other Segments [Member] | Lexington Commerce Center - Eagan, MN [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 1,504 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 453 |  |
Buildings & Improvements |  |  |  | 4,352 |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,077 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 492 |  |
Buildings & Improvements |  |  |  | 6,390 |  |
Total | 6,882 |  |  | 6,882 |  |
Accumulated Depreciation | $ (3,013) |  |  | (3,013) |  |
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 | $ 6,882 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 3,013 |  |  |  |  |
Other Segments [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 | $ (2,904) |  |  | (2,904) |  |
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 | 2,904 |  |  |  |  |
Other Segments [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 | $ (351) |  |  | (351) |  |
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 | 351 |  |  |  |  |
Other Segments [Member] | Minot Arrowhead - Minot, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 100 |  |
Buildings & Improvements |  |  |  | 3,216 |  |
Costs capitalized subsequent to acquisition |  |  |  | 5,554 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 176 |  |
Buildings & Improvements |  |  |  | 8,694 |  |
Total | 8,870 |  |  | 8,870 |  |
Accumulated Depreciation | $ (2,402) |  |  | (2,402) |  |
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 | $ 8,870 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,402 |  |  |  |  |
Other Segments [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 | $ (537) |  |  | (537) |  |
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 | 537 |  |  |  |  |
Other Segments [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 | $ (81) |  |  | (81) |  |
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 | 81 |  |  |  |  |
Other Segments [Member] | Minot Southgate Retail - Minot, ND [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 889 |  |
Buildings & Improvements |  |  |  | 1,734 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 889 |  |
Buildings & Improvements |  |  |  | 1,734 |  |
Total | 2,623 |  |  | 2,623 |  |
Accumulated Depreciation | $ (24) |  |  | (24) |  |
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 | $ 2,623 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 24 |  |  |  |  |
Other Segments [Member] | Plaza 16 - Minot, ND [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 6,916 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 389 |  |
Buildings & Improvements |  |  |  | 5,444 |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,860 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 598 |  |
Buildings & Improvements |  |  |  | 9,095 |  |
Total | 9,693 |  |  | 9,693 |  |
Accumulated Depreciation | $ (2,410) |  |  | (2,410) |  |
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 | $ 9,693 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 2,410 |  |  |  |  |
Other Segments [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 |  |  |  | 1,771 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 810 |  |
Buildings & Improvements |  |  |  | 12,015 |  |
Total | 12,825 |  |  | 12,825 |  |
Accumulated Depreciation | $ (507) |  |  | (507) |  |
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 | $ 12,825 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 507 |  |  |  |  |
Other Segments [Member] | Urbandale 3900 106th Street - Urbandale, IA [Member] |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |
Encumbrances |  |  |  | 10,266 |  |
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 | $ (2,955) |  |  | (2,955) |  |
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 | 2,955 |  |  |  |  |
Other Segments [Member] | Woodbury 1865 Woodlane - Woodbury, MN [Member] |  |  |  |  |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,108 |  |
Buildings & Improvements |  |  |  | 2,628 |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,884 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 1,123 |  |
Buildings & Improvements |  |  |  | 4,497 |  |
Total | 5,620 |  |  | 5,620 |  |
Accumulated Depreciation | $ (1,139) |  |  | (1,139) |  |
Date of Construction or Acquisition | 2007 |  |  |  |  |
Life on which depreciation in latest income statement is computed | 40 years |  |  |  |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | $ 5,620 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | 1,139 |  |  |  |  |
Other Segments [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 |  |  |  | 817,074 |  |
Initial Cost to Company [Abstract] |  |  |  |  |  |
Land |  |  |  | 117,284 |  |
Buildings & Improvements |  |  |  | 1,340,271 |  |
Costs capitalized subsequent to acquisition |  |  |  | 223,916 |  |
Gross amount at which carried at close of period [Abstract] |  |  |  |  |  |
Land |  |  |  | 136,979 |  |
Buildings & Improvements |  |  |  | 1,544,492 |  |
Total | 1,681,471 |  |  | 1,681,471 |  |
Accumulated Depreciation | (312,889) |  |  | $ (312,889) |  |
Reconciliations of total real estate carrying value [Abstract] |  |  |  |  |  |
Balance at close of year | 1,681,471 |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |
Balance at close of year | $ 312,889 |  |  |  |  |

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