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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($) $ in Thousands | 8 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016 | Dec. 31, 2018 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | $ 445,974 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 138,243 |  |  |
Buildings & Improvements |  |  |  |  | 1,292,639 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 202,055 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 161,965 |  |  |
Buildings & Improvements |  |  |  |  | 1,470,972 |  |  |
Total | $ 1,632,937 |  |  |  | 1,632,937 |  |  |
Accumulated Depreciation | (311,324) | $ (255,599) | $ (237,859) | $ (212,826) | (353,871) | $ (311,324) | $ (255,599) | $ (237,859)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Write down of asset and accumulated depreciation on impaired assets | 0 | (8,597) | (7,144) | 0 |  |  |  |
Other | 0 | (74) | 0 | 0 |  |  |  |
Balance at close of year | 1,632,937 |  |  |  |  |  |  |
Total real estate investments |  |  |  |  | 1,289,476 | 1,380,245 | 1,121,385 |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of year | 311,324 | 255,599 | 237,859 | 212,826 |  |  |  |
Additions during year [Abstract] |  |  |  |  |  |  |  |
Provisions for depreciation | 49,208 | 78,785 | 42,960 | 37,846 |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Accumulated depreciation on real estate sold or classified as held for sale | (6,609) | (11,033) | (14,687) | (9,957) |  |  |  |
Write down of asset and accumulated depreciation on impaired assets | 0 | (8,597) | (7,144) | 0 |  |  |  |
Other | (52) | (3,430) | (3,389) | (2,856) |  |  |  |
Balance at close of year | 353,871 | 311,324 | 255,599 | 237,859 |  |  |  |
Net basis of real estate investments for federal income tax purposes |  |  |  |  | 1,200,000 | 1,500,000 | 1,400,000 | 1,600,000
Unimproved Land |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 4,609 |  |  |
Buildings & Improvements |  |  |  |  | 0 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 692 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 5,301 |  |  |
Buildings & Improvements |  |  |  |  | 0 |  |  |
Total | 11,476 | 18,455 | 20,939 | 25,827 | 5,301 | 11,476 | 18,455 | 20,939
Accumulated Depreciation | 0 |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of year | 11,476 | 18,455 | 20,939 | 25,827 |  |  |  |
Improvements and Other | 0 | 0 | 1,024 | 205 |  |  |  |
Cost of real estate sold | (4,954) | (1,000) | 0 | (442) |  |  |  |
Impairment charge | (1,221) | (2,617) | (3,508) | (1,285) |  |  |  |
Transfers | 0 | (3,288) | 0 | (1,632) |  |  |  |
Development placed in service | 0 | 0 | 0 | (1,734) |  |  |  |
Balance at close of year | 5,301 | 11,476 | 18,455 | 20,939 |  |  |  |
Total real estate investments |  |  |  |  | 1,279,066 | 1,369,916 | 1,121,385 | 1,204,654
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |  |
Unimproved Land | Creekside Crossing - Bismarck, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,357 |  |  |
Buildings & Improvements |  |  |  |  | 0 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 692 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 3,049 |  |  |
Buildings & Improvements |  |  |  |  | 0 |  |  |
Total | 3,049 |  |  |  | 3,049 |  |  |
Accumulated Depreciation | 0 |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 3,049 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |  |
Unimproved Land | Minot 1525 24th Ave SW - Minot, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 506 |  |  |
Buildings & Improvements |  |  |  |  | 0 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 506 |  |  |
Buildings & Improvements |  |  |  |  | 0 |  |  |
Total | 506 |  |  |  | 506 |  |  |
Accumulated Depreciation | 0 |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 506 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |  |
Unimproved Land | Rapid City - Rapid City, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,376 |  |  |
Buildings & Improvements |  |  |  |  | 0 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,376 |  |  |
Buildings & Improvements |  |  |  |  | 0 |  |  |
Total | 1,376 |  |  |  | 1,376 |  |  |
Accumulated Depreciation | 0 |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 1,376 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |  |
Unimproved Land | Weston - Weston, WI |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 370 |  |  |
Buildings & Improvements |  |  |  |  | 0 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 370 |  |  |
Buildings & Improvements |  |  |  |  | 0 |  |  |
Total | 370 |  |  |  | 370 |  |  |
Accumulated Depreciation | 0 |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 370 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |  |
Wholly Owned Properties |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Total | 1,669,764 | 1,358,529 | 1,369,893 | 1,090,362 | 1,627,636 | 1,669,764 | 1,358,529 | 1,369,893
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of year | 1,669,764 | 1,358,529 | 1,369,893 | 1,090,362 |  |  |  |
Improvements and Other | 11,620 | 15,065 | 34,761 | 31,007 |  |  |  |
Total Additions | 1,681,384 | 1,742,926 | 1,466,219 | 1,406,449 |  |  |  |
Cost of real estate sold | (53,653) | (46,001) | (21,601) | (1,305) |  |  |  |
Impairment charge | 0 | (15,192) | (51,401) | 0 |  |  |  |
Write down of asset and accumulated depreciation on impaired assets | 0 | (8,597) | (7,144) | 0 |  |  |  |
Transfers | 0 | 0 | (24,156) | (26,373) |  |  |  |
Other | (95) | (3,372) | (3,388) | (8,878) |  |  |  |
Balance at close of year | 1,627,636 | 1,669,764 | 1,358,529 | 1,369,893 |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Write down of asset and accumulated depreciation on impaired assets | 0 | (8,597) | (7,144) | 0 |  |  |  |
Development in Progress |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Total | 0 | 0 | 51,681 | 153,994 | 0 | $ 0 | $ 0 | $ 51,681
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of year | 0 | 0 | 51,681 | 153,994 |  |  |  |
Improvements and Other | 0 | 0 | 7,762 | 48,109 |  |  |  |
Transfers | 0 | 0 | 0 | 1,734 |  |  |  |
Development placed in service | 0 | 0 | (59,443) | (152,156) |  |  |  |
Balance at close of year | 0 | $ 0 | $ 0 | 51,681 |  |  |  |
Multi-Family Residential |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 445,974 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 130,603 |  |  |
Buildings & Improvements |  |  |  |  | 1,260,439 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 191,875 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 153,398 |  |  |
Buildings & Improvements |  |  |  |  | 1,429,519 |  |  |
Total | 1,582,917 |  |  |  | 1,582,917 |  |  |
Accumulated Depreciation | (340,081) |  |  |  | (340,081) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 1,582,917 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 340,081 |  |  |  |  |  |  |
Multi-Family Residential | 71 France - Edina, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 55,554 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 4,721 |  |  |
Buildings & Improvements |  |  |  |  | 61,762 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 102 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 4,721 |  |  |
Buildings & Improvements |  |  |  |  | 61,864 |  |  |
Total | 66,585 |  |  |  | 66,585 |  |  |
Accumulated Depreciation | (7,861) |  |  |  | (7,861) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 66,585 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 7,861 |  |  |  |  |  |  |
Multi-Family Residential | 71 France - Edina, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | 71 France - Edina, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Alps Park - Rapid City, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,543 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 287 |  |  |
Buildings & Improvements |  |  |  |  | 5,551 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 370 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 333 |  |  |
Buildings & Improvements |  |  |  |  | 5,875 |  |  |
Total | 6,208 |  |  |  | 6,208 |  |  |
Accumulated Depreciation | (1,084) |  |  |  | (1,084) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 6,208 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,084 |  |  |  |  |  |  |
Multi-Family Residential | Alps Park - Rapid City, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Alps Park - Rapid City, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Arbors - S Sioux City, NE |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,494 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 350 |  |  |
Buildings & Improvements |  |  |  |  | 6,625 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,530 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,055 |  |  |
Buildings & Improvements |  |  |  |  | 8,450 |  |  |
Total | 9,505 |  |  |  | 9,505 |  |  |
Accumulated Depreciation | (3,328) |  |  |  | (3,328) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 9,505 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,328 |  |  |  |  |  |  |
Multi-Family Residential | Arbors - S Sioux City, NE | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Arbors - S Sioux City, NE | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Arcata - Golden Valley, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,088 |  |  |
Buildings & Improvements |  |  |  |  | 31,036 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 120 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,090 |  |  |
Buildings & Improvements |  |  |  |  | 31,154 |  |  |
Total | 33,244 |  |  |  | 33,244 |  |  |
Accumulated Depreciation | (5,281) |  |  |  | (5,281) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 33,244 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 5,281 |  |  |  |  |  |  |
Multi-Family Residential | Arcata - Golden Valley, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Arcata - Golden Valley, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Ashland - Grand Forks, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 5,115 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 741 |  |  |
Buildings & Improvements |  |  |  |  | 7,569 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 293 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 803 |  |  |
Buildings & Improvements |  |  |  |  | 7,800 |  |  |
Total | 8,603 |  |  |  | 8,603 |  |  |
Accumulated Depreciation | (1,704) |  |  |  | (1,704) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 8,603 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,704 |  |  |  |  |  |  |
Multi-Family Residential | Ashland - Grand Forks, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Ashland - Grand Forks, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Avalon Cove - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,616 |  |  |
Buildings & Improvements |  |  |  |  | 34,074 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 437 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,726 |  |  |
Buildings & Improvements |  |  |  |  | 34,401 |  |  |
Total | 36,127 |  |  |  | 36,127 |  |  |
Accumulated Depreciation | (3,237) |  |  |  | (3,237) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 36,127 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,237 |  |  |  |  |  |  |
Multi-Family Residential | Avalon Cove - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Avalon Cove - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Boulder Court - Eagan, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,067 |  |  |
Buildings & Improvements |  |  |  |  | 5,498 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,253 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,561 |  |  |
Buildings & Improvements |  |  |  |  | 8,257 |  |  |
Total | 9,818 |  |  |  | 9,818 |  |  |
Accumulated Depreciation | (3,613) |  |  |  | (3,613) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 9,818 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,613 |  |  |  |  |  |  |
Multi-Family Residential | Boulder Court - Eagan, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Boulder Court - Eagan, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Brookfield Village - Topeka, KS |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 4,847 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 509 |  |  |
Buildings & Improvements |  |  |  |  | 6,698 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,008 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 926 |  |  |
Buildings & Improvements |  |  |  |  | 8,289 |  |  |
Total | 9,215 |  |  |  | 9,215 |  |  |
Accumulated Depreciation | (3,418) |  |  |  | (3,418) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 9,215 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,418 |  |  |  |  |  |  |
Multi-Family Residential | Brookfield Village - Topeka, KS | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Brookfield Village - Topeka, KS | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Canyon Lake - Rapid City, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 2,636 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 305 |  |  |
Buildings & Improvements |  |  |  |  | 3,958 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,411 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 398 |  |  |
Buildings & Improvements |  |  |  |  | 6,276 |  |  |
Total | 6,674 |  |  |  | 6,674 |  |  |
Accumulated Depreciation | (2,794) |  |  |  | (2,794) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 6,674 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,794 |  |  |  |  |  |  |
Multi-Family Residential | Canyon Lake - Rapid City, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Canyon Lake - Rapid City, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Cardinal Point - Grand Forks, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,600 |  |  |
Buildings & Improvements |  |  |  |  | 33,400 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 52 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,615 |  |  |
Buildings & Improvements |  |  |  |  | 33,437 |  |  |
Total | 35,052 |  |  |  | 35,052 |  |  |
Accumulated Depreciation | (700) |  |  |  | (700) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 35,052 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 700 |  |  |  |  |  |  |
Multi-Family Residential | Cardinal Point - Grand Forks, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Cardinal Point - Grand Forks, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Cascade Shores - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 11,400 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,585 |  |  |
Buildings & Improvements |  |  |  |  | 16,710 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 88 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,586 |  |  |
Buildings & Improvements |  |  |  |  | 16,797 |  |  |
Total | 18,383 |  |  |  | 18,383 |  |  |
Accumulated Depreciation | (1,636) |  |  |  | (1,636) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 18,383 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,636 |  |  |  |  |  |  |
Multi-Family Residential | Cascade Shores - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Cascade Shores - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Castlerock - Billings, MT |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 6,134 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 736 |  |  |
Buildings & Improvements |  |  |  |  | 4,864 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,459 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,022 |  |  |
Buildings & Improvements |  |  |  |  | 7,037 |  |  |
Total | 8,059 |  |  |  | 8,059 |  |  |
Accumulated Depreciation | (3,879) |  |  |  | (3,879) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 8,059 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,879 |  |  |  |  |  |  |
Multi-Family Residential | Castlerock - Billings, MT | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Castlerock - Billings, MT | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Chateau - Minot, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 301 |  |  |
Buildings & Improvements |  |  |  |  | 20,058 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 940 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 326 |  |  |
Buildings & Improvements |  |  |  |  | 20,973 |  |  |
Total | 21,299 |  |  |  | 21,299 |  |  |
Accumulated Depreciation | (4,017) |  |  |  | (4,017) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 21,299 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 4,017 |  |  |  |  |  |  |
Multi-Family Residential | Chateau - Minot, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Chateau - Minot, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Cimarron Hills - Omaha, NE |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 4,406 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 706 |  |  |
Buildings & Improvements |  |  |  |  | 9,588 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,891 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,588 |  |  |
Buildings & Improvements |  |  |  |  | 13,597 |  |  |
Total | 15,185 |  |  |  | 15,185 |  |  |
Accumulated Depreciation | (6,732) |  |  |  | (6,732) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 15,185 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 6,732 |  |  |  |  |  |  |
Multi-Family Residential | Cimarron Hills - Omaha, NE | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Cimarron Hills - Omaha, NE | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Colonial Villa - Burnsville, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,401 |  |  |
Buildings & Improvements |  |  |  |  | 11,515 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 9,418 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,946 |  |  |
Buildings & Improvements |  |  |  |  | 20,388 |  |  |
Total | 23,334 |  |  |  | 23,334 |  |  |
Accumulated Depreciation | (9,557) |  |  |  | (9,557) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 23,334 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 9,557 |  |  |  |  |  |  |
Multi-Family Residential | Colonial Villa - Burnsville, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Colonial Villa - Burnsville, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Colony - Lincoln, NE |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 12,251 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,515 |  |  |
Buildings & Improvements |  |  |  |  | 15,730 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,656 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,771 |  |  |
Buildings & Improvements |  |  |  |  | 17,130 |  |  |
Total | 18,901 |  |  |  | 18,901 |  |  |
Accumulated Depreciation | (3,826) |  |  |  | (3,826) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 18,901 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,826 |  |  |  |  |  |  |
Multi-Family Residential | Colony - Lincoln, NE | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Colony - Lincoln, NE | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Commons at Southgate - Minot, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 25,655 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 5,945 |  |  |
Buildings & Improvements |  |  |  |  | 47,512 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,460 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 6,333 |  |  |
Buildings & Improvements |  |  |  |  | 48,584 |  |  |
Total | 54,917 |  |  |  | 54,917 |  |  |
Accumulated Depreciation | (8,764) |  |  |  | (8,764) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 54,917 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 8,764 |  |  |  |  |  |  |
Multi-Family Residential | Commons at Southgate - Minot, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Commons at Southgate - Minot, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Cottage West Twin Homes - Sioux Falls, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,338 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 968 |  |  |
Buildings & Improvements |  |  |  |  | 3,762 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 618 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,076 |  |  |
Buildings & Improvements |  |  |  |  | 4,272 |  |  |
Total | 5,348 |  |  |  | 5,348 |  |  |
Accumulated Depreciation | (943) |  |  |  | (943) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 5,348 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 943 |  |  |  |  |  |  |
Multi-Family Residential | Cottage West Twin Homes - Sioux Falls, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Cottage West Twin Homes - Sioux Falls, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Cottonwood - Bismarck, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,056 |  |  |
Buildings & Improvements |  |  |  |  | 17,372 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 5,583 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,625 |  |  |
Buildings & Improvements |  |  |  |  | 22,386 |  |  |
Total | 24,011 |  |  |  | 24,011 |  |  |
Accumulated Depreciation | (10,152) |  |  |  | (10,152) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 24,011 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 10,152 |  |  |  |  |  |  |
Multi-Family Residential | Cottonwood - Bismarck, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Cottonwood - Bismarck, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Country Meadows - Billings, MT |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 6,062 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 491 |  |  |
Buildings & Improvements |  |  |  |  | 7,809 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,789 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 575 |  |  |
Buildings & Improvements |  |  |  |  | 9,514 |  |  |
Total | 10,089 |  |  |  | 10,089 |  |  |
Accumulated Depreciation | (5,134) |  |  |  | (5,134) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 10,089 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 5,134 |  |  |  |  |  |  |
Multi-Family Residential | Country Meadows - Billings, MT | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Country Meadows - Billings, MT | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Crestview - Bismarck, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,511 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 235 |  |  |
Buildings & Improvements |  |  |  |  | 4,290 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,301 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 607 |  |  |
Buildings & Improvements |  |  |  |  | 6,219 |  |  |
Total | 6,826 |  |  |  | 6,826 |  |  |
Accumulated Depreciation | (4,002) |  |  |  | (4,002) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 6,826 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 4,002 |  |  |  |  |  |  |
Multi-Family Residential | Crestview - Bismarck, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Crestview - Bismarck, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Crown Colony - Topeka, KS |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 7,499 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 620 |  |  |
Buildings & Improvements |  |  |  |  | 9,956 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,949 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,207 |  |  |
Buildings & Improvements |  |  |  |  | 13,318 |  |  |
Total | 14,525 |  |  |  | 14,525 |  |  |
Accumulated Depreciation | (6,541) |  |  |  | (6,541) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 14,525 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 6,541 |  |  |  |  |  |  |
Multi-Family Residential | Crown Colony - Topeka, KS | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Crown Colony - Topeka, KS | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Crystal Bay - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 433 |  |  |
Buildings & Improvements |  |  |  |  | 11,425 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 272 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 436 |  |  |
Buildings & Improvements |  |  |  |  | 11,694 |  |  |
Total | 12,130 |  |  |  | 12,130 |  |  |
Accumulated Depreciation | (1,078) |  |  |  | (1,078) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 12,130 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,078 |  |  |  |  |  |  |
Multi-Family Residential | Crystal Bay - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Crystal Bay - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Cypress Court - St. Cloud, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 12,217 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,583 |  |  |
Buildings & Improvements |  |  |  |  | 18,879 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 252 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,612 |  |  |
Buildings & Improvements |  |  |  |  | 19,102 |  |  |
Total | 20,714 |  |  |  | 20,714 |  |  |
Accumulated Depreciation | (3,508) |  |  |  | (3,508) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 20,714 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,508 |  |  |  |  |  |  |
Multi-Family Residential | Cypress Court - St. Cloud, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Cypress Court - St. Cloud, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Deer Ridge - Jamestown, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 11,001 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 711 |  |  |
Buildings & Improvements |  |  |  |  | 24,129 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 201 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 738 |  |  |
Buildings & Improvements |  |  |  |  | 24,303 |  |  |
Total | 25,041 |  |  |  | 25,041 |  |  |
Accumulated Depreciation | (3,534) |  |  |  | (3,534) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 25,041 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,534 |  |  |  |  |  |  |
Multi-Family Residential | Deer Ridge - Jamestown, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Deer Ridge - Jamestown, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Dylan - Denver Co |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 12,155 |  |  |
Buildings & Improvements |  |  |  |  | 77,215 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 572 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 12,155 |  |  |
Buildings & Improvements |  |  |  |  | 77,787 |  |  |
Total | 89,942 |  |  |  | 89,942 |  |  |
Accumulated Depreciation | (2,917) |  |  |  | (2,917) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 89,942 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,917 |  |  |  |  |  |  |
Multi-Family Residential | Dylan - Denver Co | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Dylan - Denver Co | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Evergreen - Isanti, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,129 |  |  |
Buildings & Improvements |  |  |  |  | 5,524 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 430 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,141 |  |  |
Buildings & Improvements |  |  |  |  | 5,942 |  |  |
Total | 7,083 |  |  |  | 7,083 |  |  |
Accumulated Depreciation | (1,528) |  |  |  | (1,528) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 7,083 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,528 |  |  |  |  |  |  |
Multi-Family Residential | Evergreen - Isanti, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Evergreen - Isanti, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Forest Park - Grand Forks, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 7,011 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 810 |  |  |
Buildings & Improvements |  |  |  |  | 5,579 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 8,447 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,473 |  |  |
Buildings & Improvements |  |  |  |  | 13,363 |  |  |
Total | 14,836 |  |  |  | 14,836 |  |  |
Accumulated Depreciation | (7,928) |  |  |  | (7,928) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 14,836 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 7,928 |  |  |  |  |  |  |
Multi-Family Residential | Forest Park - Grand Forks, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Forest Park - Grand Forks, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | French Creek - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 201 |  |  |
Buildings & Improvements |  |  |  |  | 4,735 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 217 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 207 |  |  |
Buildings & Improvements |  |  |  |  | 4,946 |  |  |
Total | 5,153 |  |  |  | 5,153 |  |  |
Accumulated Depreciation | (434) |  |  |  | (434) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 5,153 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 434 |  |  |  |  |  |  |
Multi-Family Residential | French Creek - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | French Creek - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Gables Townhomes - Sioux Falls, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 1,351 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 349 |  |  |
Buildings & Improvements |  |  |  |  | 1,921 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 257 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 400 |  |  |
Buildings & Improvements |  |  |  |  | 2,127 |  |  |
Total | 2,527 |  |  |  | 2,527 |  |  |
Accumulated Depreciation | (458) |  |  |  | (458) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 2,527 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 458 |  |  |  |  |  |  |
Multi-Family Residential | Gables Townhomes - Sioux Falls, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Gables Townhomes - Sioux Falls, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Gardens - Grand Forks, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 518 |  |  |
Buildings & Improvements |  |  |  |  | 8,702 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 113 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 528 |  |  |
Buildings & Improvements |  |  |  |  | 8,805 |  |  |
Total | 9,333 |  |  |  | 9,333 |  |  |
Accumulated Depreciation | (1,017) |  |  |  | (1,017) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 9,333 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,017 |  |  |  |  |  |  |
Multi-Family Residential | Gardens - Grand Forks, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Gardens - Grand Forks, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Grand Gateway - St. Cloud, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 814 |  |  |
Buildings & Improvements |  |  |  |  | 7,086 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,888 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 961 |  |  |
Buildings & Improvements |  |  |  |  | 8,827 |  |  |
Total | 9,788 |  |  |  | 9,788 |  |  |
Accumulated Depreciation | (2,406) |  |  |  | (2,406) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 9,788 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,406 |  |  |  |  |  |  |
Multi-Family Residential | Grand Gateway - St. Cloud, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Grand Gateway - St. Cloud, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | GrandeVille at Cascade Lake - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 36,000 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 5,003 |  |  |
Buildings & Improvements |  |  |  |  | 50,363 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,651 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 5,065 |  |  |
Buildings & Improvements |  |  |  |  | 51,952 |  |  |
Total | 57,017 |  |  |  | 57,017 |  |  |
Accumulated Depreciation | (5,814) |  |  |  | (5,814) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 57,017 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 5,814 |  |  |  |  |  |  |
Multi-Family Residential | GrandeVille at Cascade Lake - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | GrandeVille at Cascade Lake - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Greenfield - Omaha, NE |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 578 |  |  |
Buildings & Improvements |  |  |  |  | 4,122 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,344 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 872 |  |  |
Buildings & Improvements |  |  |  |  | 5,172 |  |  |
Total | 6,044 |  |  |  | 6,044 |  |  |
Accumulated Depreciation | (1,799) |  |  |  | (1,799) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 6,044 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,799 |  |  |  |  |  |  |
Multi-Family Residential | Greenfield - Omaha, NE | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Greenfield - Omaha, NE | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Heritage Manor - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,248 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 403 |  |  |
Buildings & Improvements |  |  |  |  | 6,968 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,317 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 682 |  |  |
Buildings & Improvements |  |  |  |  | 10,006 |  |  |
Total | 10,688 |  |  |  | 10,688 |  |  |
Accumulated Depreciation | (5,251) |  |  |  | (5,251) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 10,688 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 5,251 |  |  |  |  |  |  |
Multi-Family Residential | Heritage Manor - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Heritage Manor - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Homestead Garden - Rapid City, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 655 |  |  |
Buildings & Improvements |  |  |  |  | 14,139 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 665 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 718 |  |  |
Buildings & Improvements |  |  |  |  | 14,741 |  |  |
Total | 15,459 |  |  |  | 15,459 |  |  |
Accumulated Depreciation | (2,195) |  |  |  | (2,195) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 15,459 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,195 |  |  |  |  |  |  |
Multi-Family Residential | Homestead Garden - Rapid City, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Homestead Garden - Rapid City, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Indian Hills - Sioux City, IA |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 294 |  |  |
Buildings & Improvements |  |  |  |  | 2,921 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,489 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 470 |  |  |
Buildings & Improvements |  |  |  |  | 7,234 |  |  |
Total | 7,704 |  |  |  | 7,704 |  |  |
Accumulated Depreciation | (2,361) |  |  |  | (2,361) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 7,704 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,361 |  |  |  |  |  |  |
Multi-Family Residential | Indian Hills - Sioux City, IA | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Indian Hills - Sioux City, IA | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Kirkwood Manor - Bismarck, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,039 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 449 |  |  |
Buildings & Improvements |  |  |  |  | 2,725 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,950 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 625 |  |  |
Buildings & Improvements |  |  |  |  | 4,499 |  |  |
Total | 5,124 |  |  |  | 5,124 |  |  |
Accumulated Depreciation | (2,498) |  |  |  | (2,498) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 5,124 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,498 |  |  |  |  |  |  |
Multi-Family Residential | Kirkwood Manor - Bismarck, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Kirkwood Manor - Bismarck, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Lakeside Village Lincoln, NE |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 12,111 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,215 |  |  |
Buildings & Improvements |  |  |  |  | 15,837 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,202 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,348 |  |  |
Buildings & Improvements |  |  |  |  | 16,906 |  |  |
Total | 18,254 |  |  |  | 18,254 |  |  |
Accumulated Depreciation | (3,659) |  |  |  | (3,659) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 18,254 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,659 |  |  |  |  |  |  |
Multi-Family Residential | Lakeside Village Lincoln, NE | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Lakeside Village Lincoln, NE | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Landmark - Grand Forks, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 184 |  |  |
Buildings & Improvements |  |  |  |  | 1,514 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,215 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 366 |  |  |
Buildings & Improvements |  |  |  |  | 2,547 |  |  |
Total | 2,913 |  |  |  | 2,913 |  |  |
Accumulated Depreciation | (1,492) |  |  |  | (1,492) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 2,913 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,492 |  |  |  |  |  |  |
Multi-Family Residential | Landmark - Grand Forks, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  |  | 30 years |  |  |  |  |
Multi-Family Residential | Landmark - Grand Forks, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  |  | 37 years |  |  |  |  |
Multi-Family Residential | Legacy - Grand Forks, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 14,031 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,362 |  |  |
Buildings & Improvements |  |  |  |  | 21,727 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 10,479 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,263 |  |  |
Buildings & Improvements |  |  |  |  | 31,305 |  |  |
Total | 33,568 |  |  |  | 33,568 |  |  |
Accumulated Depreciation | (15,220) |  |  |  | (15,220) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 33,568 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 15,220 |  |  |  |  |  |  |
Multi-Family Residential | Legacy - Grand Forks, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Legacy - Grand Forks, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Legacy Heights - Bismarck, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,207 |  |  |
Buildings & Improvements |  |  |  |  | 13,742 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 419 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,307 |  |  |
Buildings & Improvements |  |  |  |  | 14,061 |  |  |
Total | 15,368 |  |  |  | 15,368 |  |  |
Accumulated Depreciation | (1,578) |  |  |  | (1,578) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 15,368 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,578 |  |  |  |  |  |  |
Multi-Family Residential | Legacy Heights - Bismarck, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Legacy Heights - Bismarck, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Mariposa - Topeka, KS |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 2,715 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 399 |  |  |
Buildings & Improvements |  |  |  |  | 5,110 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,041 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 455 |  |  |
Buildings & Improvements |  |  |  |  | 6,095 |  |  |
Total | 6,550 |  |  |  | 6,550 |  |  |
Accumulated Depreciation | (2,228) |  |  |  | (2,228) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 6,550 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,228 |  |  |  |  |  |  |
Multi-Family Residential | Mariposa - Topeka, KS | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Mariposa - Topeka, KS | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Meadows - Jamestown, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 590 |  |  |
Buildings & Improvements |  |  |  |  | 4,519 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,955 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 710 |  |  |
Buildings & Improvements |  |  |  |  | 6,354 |  |  |
Total | 7,064 |  |  |  | 7,064 |  |  |
Accumulated Depreciation | (3,091) |  |  |  | (3,091) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 7,064 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,091 |  |  |  |  |  |  |
Multi-Family Residential | Meadows - Jamestown, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Meadows - Jamestown, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Monticello Crossings - Monticello, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,734 |  |  |
Buildings & Improvements |  |  |  |  | 30,136 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 28 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,734 |  |  |
Buildings & Improvements |  |  |  |  | 30,164 |  |  |
Total | 31,898 |  |  |  | 31,898 |  |  |
Accumulated Depreciation | (2,648) |  |  |  | (2,648) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 31,898 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,648 |  |  |  |  |  |  |
Multi-Family Residential | Monticello Crossings - Monticello, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Monticello Crossings - Monticello, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Monticello Village - Monticello, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 490 |  |  |
Buildings & Improvements |  |  |  |  | 3,756 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,108 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 638 |  |  |
Buildings & Improvements |  |  |  |  | 4,716 |  |  |
Total | 5,354 |  |  |  | 5,354 |  |  |
Accumulated Depreciation | (1,922) |  |  |  | (1,922) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 5,354 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,922 |  |  |  |  |  |  |
Multi-Family Residential | Monticello Village - Monticello, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Monticello Village - Monticello, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | North Pointe - Bismarck, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,175 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 303 |  |  |
Buildings & Improvements |  |  |  |  | 3,957 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,359 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 384 |  |  |
Buildings & Improvements |  |  |  |  | 5,235 |  |  |
Total | 5,619 |  |  |  | 5,619 |  |  |
Accumulated Depreciation | (2,331) |  |  |  | (2,331) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 5,619 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,331 |  |  |  |  |  |  |
Multi-Family Residential | North Pointe - Bismarck, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | North Pointe - Bismarck, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Northridge - Bismarck, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 884 |  |  |
Buildings & Improvements |  |  |  |  | 7,515 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 191 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 974 |  |  |
Buildings & Improvements |  |  |  |  | 7,616 |  |  |
Total | 8,590 |  |  |  | 8,590 |  |  |
Accumulated Depreciation | (1,041) |  |  |  | (1,041) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 8,590 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,041 |  |  |  |  |  |  |
Multi-Family Residential | Northridge - Bismarck, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Northridge - Bismarck, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Oakmont Estates - Sioux Falls, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 422 |  |  |
Buildings & Improvements |  |  |  |  | 4,838 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,404 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 711 |  |  |
Buildings & Improvements |  |  |  |  | 5,953 |  |  |
Total | 6,664 |  |  |  | 6,664 |  |  |
Accumulated Depreciation | (2,664) |  |  |  | (2,664) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 6,664 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,664 |  |  |  |  |  |  |
Multi-Family Residential | Oakmont Estates - Sioux Falls, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Oakmont Estates - Sioux Falls, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Oakwood Estates - Sioux Falls, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 543 |  |  |
Buildings & Improvements |  |  |  |  | 2,784 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,828 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 868 |  |  |
Buildings & Improvements |  |  |  |  | 7,287 |  |  |
Total | 8,155 |  |  |  | 8,155 |  |  |
Accumulated Depreciation | (5,235) |  |  |  | (5,235) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 8,155 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 5,235 |  |  |  |  |  |  |
Multi-Family Residential | Oakwood Estates - Sioux Falls, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Oakwood Estates - Sioux Falls, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Olympic Village - Billings, MT |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 9,777 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,164 |  |  |
Buildings & Improvements |  |  |  |  | 10,441 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,033 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,829 |  |  |
Buildings & Improvements |  |  |  |  | 13,809 |  |  |
Total | 15,638 |  |  |  | 15,638 |  |  |
Accumulated Depreciation | (6,978) |  |  |  | (6,978) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 15,638 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 6,978 |  |  |  |  |  |  |
Multi-Family Residential | Olympic Village - Billings, MT | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Olympic Village - Billings, MT | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Olympik Village - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,895 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,034 |  |  |
Buildings & Improvements |  |  |  |  | 6,109 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,718 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,368 |  |  |
Buildings & Improvements |  |  |  |  | 8,493 |  |  |
Total | 9,861 |  |  |  | 9,861 |  |  |
Accumulated Depreciation | (3,336) |  |  |  | (3,336) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 9,861 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,336 |  |  |  |  |  |  |
Multi-Family Residential | Olympik Village - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Olympik Village - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Oxbo - St Paul, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 5,809 |  |  |
Buildings & Improvements |  |  |  |  | 51,586 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 167 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 5,879 |  |  |
Buildings & Improvements |  |  |  |  | 51,683 |  |  |
Total | 57,562 |  |  |  | 57,562 |  |  |
Accumulated Depreciation | (3,093) |  |  |  | (3,093) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 57,562 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,093 |  |  |  |  |  |  |
Multi-Family Residential | Oxbo - St Paul, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Oxbo - St Paul, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Oxbow Park - Sioux Falls, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 404 |  |  |
Buildings & Improvements |  |  |  |  | 3,152 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,738 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 993 |  |  |
Buildings & Improvements |  |  |  |  | 6,301 |  |  |
Total | 7,294 |  |  |  | 7,294 |  |  |
Accumulated Depreciation | (4,496) |  |  |  | (4,496) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 7,294 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 4,496 |  |  |  |  |  |  |
Multi-Family Residential | Oxbow Park - Sioux Falls, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Oxbow Park - Sioux Falls, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Park Meadows - Waite Park, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 7,934 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,143 |  |  |
Buildings & Improvements |  |  |  |  | 9,099 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 9,999 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,121 |  |  |
Buildings & Improvements |  |  |  |  | 18,120 |  |  |
Total | 20,241 |  |  |  | 20,241 |  |  |
Accumulated Depreciation | (9,812) |  |  |  | (9,812) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 20,241 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 9,812 |  |  |  |  |  |  |
Multi-Family Residential | Park Meadows - Waite Park, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Park Meadows - Waite Park, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Park Place - Plymouth, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 10,609 |  |  |
Buildings & Improvements |  |  |  |  | 80,781 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,471 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 10,623 |  |  |
Buildings & Improvements |  |  |  |  | 84,238 |  |  |
Total | 94,861 |  |  |  | 94,861 |  |  |
Accumulated Depreciation | (3,892) |  |  |  | (3,892) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 94,861 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,892 |  |  |  |  |  |  |
Multi-Family Residential | Park Place - Plymouth, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Park Place - Plymouth, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Pebble Springs - Bismarck, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 7 |  |  |
Buildings & Improvements |  |  |  |  | 748 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 236 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 65 |  |  |
Buildings & Improvements |  |  |  |  | 926 |  |  |
Total | 991 |  |  |  | 991 |  |  |
Accumulated Depreciation | (497) |  |  |  | (497) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 991 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 497 |  |  |  |  |  |  |
Multi-Family Residential | Pebble Springs - Bismarck, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Pebble Springs - Bismarck, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Pinehurst - Billings, MT |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 72 |  |  |
Buildings & Improvements |  |  |  |  | 687 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 523 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 168 |  |  |
Buildings & Improvements |  |  |  |  | 1,114 |  |  |
Total | 1,282 |  |  |  | 1,282 |  |  |
Accumulated Depreciation | (493) |  |  |  | (493) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 1,282 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 493 |  |  |  |  |  |  |
Multi-Family Residential | Pinehurst - Billings, MT | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Pinehurst - Billings, MT | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Plaza - Minot, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 867 |  |  |
Buildings & Improvements |  |  |  |  | 12,784 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,046 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 998 |  |  |
Buildings & Improvements |  |  |  |  | 15,699 |  |  |
Total | 16,697 |  |  |  | 16,697 |  |  |
Accumulated Depreciation | (4,410) |  |  |  | (4,410) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 16,697 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 4,410 |  |  |  |  |  |  |
Multi-Family Residential | Plaza - Minot, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Plaza - Minot, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Pointe West - Rapid City, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 2,393 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 240 |  |  |
Buildings & Improvements |  |  |  |  | 3,538 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,095 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 431 |  |  |
Buildings & Improvements |  |  |  |  | 5,442 |  |  |
Total | 5,873 |  |  |  | 5,873 |  |  |
Accumulated Depreciation | (3,253) |  |  |  | (3,253) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 5,873 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,253 |  |  |  |  |  |  |
Multi-Family Residential | Pointe West - Rapid City, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Pointe West - Rapid City, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Ponds at Heritage Place - Sartell, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 395 |  |  |
Buildings & Improvements |  |  |  |  | 4,564 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 446 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 413 |  |  |
Buildings & Improvements |  |  |  |  | 4,992 |  |  |
Total | 5,405 |  |  |  | 5,405 |  |  |
Accumulated Depreciation | (1,098) |  |  |  | (1,098) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 5,405 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,098 |  |  |  |  |  |  |
Multi-Family Residential | Ponds at Heritage Place - Sartell, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Ponds at Heritage Place - Sartell, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Prairie Winds - Sioux Falls, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 1,292 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 144 |  |  |
Buildings & Improvements |  |  |  |  | 1,816 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 739 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 309 |  |  |
Buildings & Improvements |  |  |  |  | 2,390 |  |  |
Total | 2,699 |  |  |  | 2,699 |  |  |
Accumulated Depreciation | (1,589) |  |  |  | (1,589) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 2,699 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,589 |  |  |  |  |  |  |
Multi-Family Residential | Prairie Winds - Sioux Falls, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Prairie Winds - Sioux Falls, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Quarry Ridge - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 25,277 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,254 |  |  |
Buildings & Improvements |  |  |  |  | 30,024 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,092 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,406 |  |  |
Buildings & Improvements |  |  |  |  | 31,964 |  |  |
Total | 34,370 |  |  |  | 34,370 |  |  |
Accumulated Depreciation | (8,553) |  |  |  | (8,553) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 34,370 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 8,553 |  |  |  |  |  |  |
Multi-Family Residential | Quarry Ridge - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Quarry Ridge - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Red 20 - Minneapolis, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 22,219 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,900 |  |  |
Buildings & Improvements |  |  |  |  | 24,116 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 185 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,908 |  |  |
Buildings & Improvements |  |  |  |  | 24,293 |  |  |
Total | 26,201 |  |  |  | 26,201 |  |  |
Accumulated Depreciation | (4,221) |  |  |  | (4,221) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 26,201 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 4,221 |  |  |  |  |  |  |
Multi-Family Residential | Red 20 - Minneapolis, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Red 20 - Minneapolis, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Regency Park Estates - St. Cloud, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 7,838 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 702 |  |  |
Buildings & Improvements |  |  |  |  | 10,198 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,455 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,060 |  |  |
Buildings & Improvements |  |  |  |  | 12,295 |  |  |
Total | 13,355 |  |  |  | 13,355 |  |  |
Accumulated Depreciation | (3,121) |  |  |  | (3,121) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 13,355 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,121 |  |  |  |  |  |  |
Multi-Family Residential | Regency Park Estates - St. Cloud, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Regency Park Estates - St. Cloud, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Ridge Oaks - Sioux City, IA |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,131 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 178 |  |  |
Buildings & Improvements |  |  |  |  | 4,073 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,007 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 318 |  |  |
Buildings & Improvements |  |  |  |  | 6,940 |  |  |
Total | 7,258 |  |  |  | 7,258 |  |  |
Accumulated Depreciation | (3,250) |  |  |  | (3,250) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 7,258 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,250 |  |  |  |  |  |  |
Multi-Family Residential | Ridge Oaks - Sioux City, IA | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Ridge Oaks - Sioux City, IA | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Rimrock West - Billings, MT |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,046 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 330 |  |  |
Buildings & Improvements |  |  |  |  | 3,489 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,062 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 516 |  |  |
Buildings & Improvements |  |  |  |  | 5,365 |  |  |
Total | 5,881 |  |  |  | 5,881 |  |  |
Accumulated Depreciation | (2,647) |  |  |  | (2,647) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 5,881 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,647 |  |  |  |  |  |  |
Multi-Family Residential | Rimrock West - Billings, MT | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Rimrock West - Billings, MT | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | River Ridge - Bismarck, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 576 |  |  |
Buildings & Improvements |  |  |  |  | 24,670 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 899 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 793 |  |  |
Buildings & Improvements |  |  |  |  | 25,352 |  |  |
Total | 26,145 |  |  |  | 26,145 |  |  |
Accumulated Depreciation | (5,598) |  |  |  | (5,598) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 26,145 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 5,598 |  |  |  |  |  |  |
Multi-Family Residential | River Ridge - Bismarck, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | River Ridge - Bismarck, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Rocky Meadows - Billings, MT |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 4,722 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 656 |  |  |
Buildings & Improvements |  |  |  |  | 5,726 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,617 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 815 |  |  |
Buildings & Improvements |  |  |  |  | 7,184 |  |  |
Total | 7,999 |  |  |  | 7,999 |  |  |
Accumulated Depreciation | (4,087) |  |  |  | (4,087) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 7,999 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 4,087 |  |  |  |  |  |  |
Multi-Family Residential | Rocky Meadows - Billings, MT | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Rocky Meadows - Billings, MT | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Rum River - Isanti, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,235 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 843 |  |  |
Buildings & Improvements |  |  |  |  | 4,823 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 463 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 864 |  |  |
Buildings & Improvements |  |  |  |  | 5,265 |  |  |
Total | 6,129 |  |  |  | 6,129 |  |  |
Accumulated Depreciation | (1,700) |  |  |  | (1,700) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 6,129 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,700 |  |  |  |  |  |  |
Multi-Family Residential | Rum River - Isanti, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Rum River - Isanti, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Sherwood - Topeka, KS |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 11,268 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,142 |  |  |
Buildings & Improvements |  |  |  |  | 14,684 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 5,327 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,159 |  |  |
Buildings & Improvements |  |  |  |  | 18,994 |  |  |
Total | 21,153 |  |  |  | 21,153 |  |  |
Accumulated Depreciation | (9,478) |  |  |  | (9,478) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 21,153 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 9,478 |  |  |  |  |  |  |
Multi-Family Residential | Sherwood - Topeka, KS | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Sherwood - Topeka, KS | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Sierra Vista - Sioux Falls, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 241 |  |  |
Buildings & Improvements |  |  |  |  | 2,097 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 596 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 291 |  |  |
Buildings & Improvements |  |  |  |  | 2,643 |  |  |
Total | 2,934 |  |  |  | 2,934 |  |  |
Accumulated Depreciation | (662) |  |  |  | (662) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 2,934 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 662 |  |  |  |  |  |  |
Multi-Family Residential | Sierra Vista - Sioux Falls, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Sierra Vista - Sioux Falls, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Silver Springs - Rapid City, SD |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 2,088 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 215 |  |  |
Buildings & Improvements |  |  |  |  | 3,007 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 724 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 257 |  |  |
Buildings & Improvements |  |  |  |  | 3,689 |  |  |
Total | 3,946 |  |  |  | 3,946 |  |  |
Accumulated Depreciation | (574) |  |  |  | (574) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 3,946 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 574 |  |  |  |  |  |  |
Multi-Family Residential | Silver Springs - Rapid City, SD | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Silver Springs - Rapid City, SD | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | South Pointe - Minot, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 7,871 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 550 |  |  |
Buildings & Improvements |  |  |  |  | 9,548 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 5,638 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,373 |  |  |
Buildings & Improvements |  |  |  |  | 14,363 |  |  |
Total | 15,736 |  |  |  | 15,736 |  |  |
Accumulated Depreciation | (8,222) |  |  |  | (8,222) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 15,736 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 8,222 |  |  |  |  |  |  |
Multi-Family Residential | South Pointe - Minot, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | South Pointe - Minot, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Southpoint - Grand Forks, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 576 |  |  |
Buildings & Improvements |  |  |  |  | 9,893 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 169 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 633 |  |  |
Buildings & Improvements |  |  |  |  | 10,005 |  |  |
Total | 10,638 |  |  |  | 10,638 |  |  |
Accumulated Depreciation | (1,548) |  |  |  | (1,548) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 10,638 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,548 |  |  |  |  |  |  |
Multi-Family Residential | Southpoint - Grand Forks, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Southpoint - Grand Forks, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Southwind - Grand Forks, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 5,031 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 400 |  |  |
Buildings & Improvements |  |  |  |  | 4,938 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,119 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 827 |  |  |
Buildings & Improvements |  |  |  |  | 8,630 |  |  |
Total | 9,457 |  |  |  | 9,457 |  |  |
Accumulated Depreciation | (4,988) |  |  |  | (4,988) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 9,457 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 4,988 |  |  |  |  |  |  |
Multi-Family Residential | Southwind - Grand Forks, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Southwind - Grand Forks, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Sunset Trail - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 7,476 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 336 |  |  |
Buildings & Improvements |  |  |  |  | 12,814 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,283 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 720 |  |  |
Buildings & Improvements |  |  |  |  | 15,713 |  |  |
Total | 16,433 |  |  |  | 16,433 |  |  |
Accumulated Depreciation | (7,608) |  |  |  | (7,608) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 16,433 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 7,608 |  |  |  |  |  |  |
Multi-Family Residential | Sunset Trail - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Sunset Trail - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Thomasbrook - Lincoln, NE |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 5,496 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 600 |  |  |
Buildings & Improvements |  |  |  |  | 10,306 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 5,329 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,646 |  |  |
Buildings & Improvements |  |  |  |  | 14,589 |  |  |
Total | 16,235 |  |  |  | 16,235 |  |  |
Accumulated Depreciation | (6,829) |  |  |  | (6,829) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 16,235 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 6,829 |  |  |  |  |  |  |
Multi-Family Residential | Thomasbrook - Lincoln, NE | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Thomasbrook - Lincoln, NE | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Valley Park - Grand Forks, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 3,555 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 294 |  |  |
Buildings & Improvements |  |  |  |  | 4,137 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,049 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,223 |  |  |
Buildings & Improvements |  |  |  |  | 7,257 |  |  |
Total | 8,480 |  |  |  | 8,480 |  |  |
Accumulated Depreciation | (4,072) |  |  |  | (4,072) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 8,480 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 4,072 |  |  |  |  |  |  |
Multi-Family Residential | Valley Park - Grand Forks, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Valley Park - Grand Forks, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Villa West - Topeka, KS |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 11,381 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,590 |  |  |
Buildings & Improvements |  |  |  |  | 15,760 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,882 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,338 |  |  |
Buildings & Improvements |  |  |  |  | 16,894 |  |  |
Total | 19,232 |  |  |  | 19,232 |  |  |
Accumulated Depreciation | (3,787) |  |  |  | (3,787) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 19,232 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,787 |  |  |  |  |  |  |
Multi-Family Residential | Villa West - Topeka, KS | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Villa West - Topeka, KS | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Village Green - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 234 |  |  |
Buildings & Improvements |  |  |  |  | 2,296 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,068 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 359 |  |  |
Buildings & Improvements |  |  |  |  | 3,239 |  |  |
Total | 3,598 |  |  |  | 3,598 |  |  |
Accumulated Depreciation | (1,394) |  |  |  | (1,394) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 3,598 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 1,394 |  |  |  |  |  |  |
Multi-Family Residential | Village Green - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Village Green - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Westend - Denver CO |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 25,525 |  |  |
Buildings & Improvements |  |  |  |  | 102,180 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 174 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 25,525 |  |  |
Buildings & Improvements |  |  |  |  | 102,354 |  |  |
Total | 127,879 |  |  |  | 127,879 |  |  |
Accumulated Depreciation | (2,848) |  |  |  | (2,848) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 127,879 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,848 |  |  |  |  |  |  |
Multi-Family Residential | Westend - Denver CO | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Westend - Denver CO | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | West Stonehill - Waite Park, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 7,720 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 939 |  |  |
Buildings & Improvements |  |  |  |  | 10,167 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 7,836 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,914 |  |  |
Buildings & Improvements |  |  |  |  | 17,028 |  |  |
Total | 18,942 |  |  |  | 18,942 |  |  |
Accumulated Depreciation | (9,874) |  |  |  | (9,874) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 18,942 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 9,874 |  |  |  |  |  |  |
Multi-Family Residential | West Stonehill - Waite Park, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | West Stonehill - Waite Park, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Westwood Park - Bismarck, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 1,814 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 116 |  |  |
Buildings & Improvements |  |  |  |  | 1,909 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,063 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 293 |  |  |
Buildings & Improvements |  |  |  |  | 3,795 |  |  |
Total | 4,088 |  |  |  | 4,088 |  |  |
Accumulated Depreciation | (2,114) |  |  |  | (2,114) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 4,088 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 2,114 |  |  |  |  |  |  |
Multi-Family Residential | Westwood Park - Bismarck, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Westwood Park - Bismarck, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Whispering Ridge - Omaha, NE |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 20,561 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,139 |  |  |
Buildings & Improvements |  |  |  |  | 25,424 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 1,693 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,438 |  |  |
Buildings & Improvements |  |  |  |  | 26,818 |  |  |
Total | 29,256 |  |  |  | 29,256 |  |  |
Accumulated Depreciation | (5,317) |  |  |  | (5,317) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 29,256 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 5,317 |  |  |  |  |  |  |
Multi-Family Residential | Whispering Ridge - Omaha, NE | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Whispering Ridge - Omaha, NE | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Winchester - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 748 |  |  |
Buildings & Improvements |  |  |  |  | 5,622 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 2,554 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,044 |  |  |
Buildings & Improvements |  |  |  |  | 7,880 |  |  |
Total | 8,924 |  |  |  | 8,924 |  |  |
Accumulated Depreciation | (3,536) |  |  |  | (3,536) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 8,924 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,536 |  |  |  |  |  |  |
Multi-Family Residential | Winchester - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Winchester - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Woodridge - Rochester, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 5,610 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 370 |  |  |
Buildings & Improvements |  |  |  |  | 6,028 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,358 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 750 |  |  |
Buildings & Improvements |  |  |  |  | 9,006 |  |  |
Total | 9,756 |  |  |  | 9,756 |  |  |
Accumulated Depreciation | (5,068) |  |  |  | (5,068) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 9,756 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 5,068 |  |  |  |  |  |  |
Multi-Family Residential | Woodridge - Rochester, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Multi-Family Residential | Woodridge - Rochester, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Multi-Family Residential | Wholly Owned Properties |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Additions | 0 | $ 369,332 | $ 61,565 | $ 285,080 |  |  |  |
Other - Mixed Use |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 389 |  |  |
Buildings & Improvements |  |  |  |  | 17,320 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 5,012 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 598 |  |  |
Buildings & Improvements |  |  |  |  | 22,123 |  |  |
Total | 22,721 |  |  |  | 22,721 |  |  |
Accumulated Depreciation | (4,674) |  |  |  | (4,674) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 22,721 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 4,674 |  |  |  |  |  |  |
Other - Mixed Use | 71 France - Edina, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |  |
Buildings & Improvements |  |  |  |  | 5,879 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 775 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |  |
Buildings & Improvements |  |  |  |  | 6,654 |  |  |
Total | 6,654 |  |  |  | 6,654 |  |  |
Accumulated Depreciation | (585) |  |  |  | (585) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 6,654 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 585 |  |  |  |  |  |  |
Other - Mixed Use | 71 France - Edina, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Other - Mixed Use | 71 France - Edina, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Other - Mixed Use | Oxbo - St Paul, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |  |
Buildings & Improvements |  |  |  |  | 3,472 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 54 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |  |
Buildings & Improvements |  |  |  |  | 3,526 |  |  |
Total | 3,526 |  |  |  | 3,526 |  |  |
Accumulated Depreciation | (194) |  |  |  | (194) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 3,526 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 194 |  |  |  |  |  |  |
Other - Mixed Use | Oxbo - St Paul, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Other - Mixed Use | Oxbo - St Paul, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Other - Mixed Use | Plaza - Minot, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 389 |  |  |
Buildings & Improvements |  |  |  |  | 5,444 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 3,764 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 598 |  |  |
Buildings & Improvements |  |  |  |  | 8,999 |  |  |
Total | 9,597 |  |  |  | 9,597 |  |  |
Accumulated Depreciation | (3,494) |  |  |  | (3,494) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 9,597 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,494 |  |  |  |  |  |  |
Other - Mixed Use | Plaza - Minot, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Other - Mixed Use | Plaza - Minot, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Other - Mixed Use | Red 20 - Minneapolis, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |  |
Buildings & Improvements |  |  |  |  | 2,525 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 419 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 0 |  |  |
Buildings & Improvements |  |  |  |  | 2,944 |  |  |
Total | 2,944 |  |  |  | 2,944 |  |  |
Accumulated Depreciation | (401) |  |  |  | (401) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 2,944 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 401 |  |  |  |  |  |  |
Other - Mixed Use | Red 20 - Minneapolis, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Other - Mixed Use | Red 20 - Minneapolis, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Other - Commercial |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,642 |  |  |
Buildings & Improvements |  |  |  |  | 14,880 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,476 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 2,668 |  |  |
Buildings & Improvements |  |  |  |  | 19,330 |  |  |
Total | 21,998 |  |  |  | 21,998 |  |  |
Accumulated Depreciation | (9,116) |  |  |  | (9,116) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 21,998 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 9,116 |  |  |  |  |  |  |
Other - Commercial | Dakota West Plaza - Minot , ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 92 |  |  |
Buildings & Improvements |  |  |  |  | 493 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 39 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 106 |  |  |
Buildings & Improvements |  |  |  |  | 518 |  |  |
Total | 624 |  |  |  | 624 |  |  |
Accumulated Depreciation | (185) |  |  |  | (185) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 624 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 185 |  |  |  |  |  |  |
Other - Commercial | Dakota West Plaza - Minot , ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Other - Commercial | Dakota West Plaza - Minot , ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Other - Commercial | Minot 1400 31st Ave - Minot, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,026 |  |  |
Buildings & Improvements |  |  |  |  | 6,143 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 4,437 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,038 |  |  |
Buildings & Improvements |  |  |  |  | 10,568 |  |  |
Total | 11,606 |  |  |  | 11,606 |  |  |
Accumulated Depreciation | (5,485) |  |  |  | (5,485) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 11,606 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 5,485 |  |  |  |  |  |  |
Other - Commercial | Minot 1400 31st Ave - Minot, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Other - Commercial | Minot 1400 31st Ave - Minot, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Other - Commercial | Minot IPS - Minot, ND |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 416 |  |  |
Buildings & Improvements |  |  |  |  | 5,952 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 416 |  |  |
Buildings & Improvements |  |  |  |  | 5,952 |  |  |
Total | 6,368 |  |  |  | 6,368 |  |  |
Accumulated Depreciation | (3,399) |  |  |  | (3,399) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 6,368 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 3,399 |  |  |  |  |  |  |
Other - Commercial | Minot IPS - Minot, ND | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Other - Commercial | Minot IPS - Minot, ND | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Other - Commercial | Woodbury 1865 Woodlane - Woodbury, MN |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,108 |  |  |
Buildings & Improvements |  |  |  |  | 2,292 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 1,108 |  |  |
Buildings & Improvements |  |  |  |  | 2,292 |  |  |
Total | 3,400 |  |  |  | 3,400 |  |  |
Accumulated Depreciation | (47) |  |  |  | (47) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 3,400 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | 47 |  |  |  |  |  |  |
Other - Commercial | Woodbury 1865 Woodlane - Woodbury, MN | Minimum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 30 years |  |  |  |  |  |
Other - Commercial | Woodbury 1865 Woodlane - Woodbury, MN | Maximum |  |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed |  | 37 years |  |  |  |  |  |
Subtotal |  |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |  |
Encumbrances |  |  |  |  | 445,974 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 133,634 |  |  |
Buildings & Improvements |  |  |  |  | 1,292,639 |  |  |
Costs capitalized subsequent to acquisition |  |  |  |  | 201,363 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |  |
Land |  |  |  |  | 156,664 |  |  |
Buildings & Improvements |  |  |  |  | 1,470,972 |  |  |
Total | 1,627,636 |  |  |  | 1,627,636 |  |  |
Accumulated Depreciation | (353,871) |  |  |  | $ (353,871) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at close of year | 1,627,636 |  |  |  |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |  |
Balance at close of year | $ 353,871 |  |  |  |  |  |  |

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