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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | $ 512,140 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 152,834 |  |  |
Buildings & Improvements |  |  |  | 1,330,889 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 197,517 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 175,438 |  |  |
Buildings & Improvements |  |  |  | 1,505,802 |  |  |
Total | $ 1,681,240 |  |  | 1,681,240 |  |  |
Accumulated Depreciation | (311,324) | $ (255,599) | $ (237,859) | (311,324) | $ (255,599) | $ (237,859) | $ (212,826)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Write down of asset and accumulated depreciation on impaired assets | (8,597) | (7,144) | 0 |  |  |  |
Other | (74) | 0 | 0 |  |  |  |
Balance at close of year | 1,681,240 |  |  |  |  |  |
Total real estate investments |  |  |  | 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 | 311,324 | 255,599 | 237,859 | 212,826
Additions during year [Abstract] |  |  |  |  |  |  |
Provisions for depreciation | 78,785 | 42,960 | 37,846 |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Accumulated depreciation on real estate sold or classified as held for sale | (11,033) | (14,687) | (9,957) |  |  |  |
Write down of asset and accumulated depreciation on impaired assets | (8,597) | (7,144) | 0 |  |  |  |
Other | (3,430) | (3,389) | (2,856) |  |  |  |
Balance at close of year | 311,324 | 255,599 | 237,859 |  |  |  |
Net basis of real estate investments for federal income tax purposes |  |  |  | 1,500,000 | 1,400,000 | 1,600,000 |
Unimproved Land [Member] |  |  |  |  |  |  |
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 |  |  |  | 10,427 |  |  |
Buildings & Improvements |  |  |  | 0 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 1,049 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 11,476 |  |  |
Buildings & Improvements |  |  |  | 0 |  |  |
Total | 18,455 | 20,939 | 25,827 | 11,476 | 18,455 | 20,939 | 25,827
Accumulated Depreciation | 0 |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 18,455 | 20,939 | 25,827 |  |  |  |
Improvements and Other | 0 | 1,024 | 205 |  |  |  |
Cost of real estate sold | (1,000) | 0 | (442) |  |  |  |
Impairment charge | (2,617) | (3,508) | (1,285) |  |  |  |
Transfers | (3,288) | 0 | (1,632) |  |  |  |
Development placed in service | 0 | 0 | (1,734) |  |  |  |
Balance at close of year | 11,476 | 18,455 | 20,939 |  |  |  |
Total real estate investments |  |  |  | 1,369,916 | 1,121,385 | 1,204,654 |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |
Unimproved Land [Member] | Renaissance Heights - Williston, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 750 |  |  |
Buildings & Improvements |  |  |  | 0 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 750 |  |  |
Buildings & Improvements |  |  |  | 0 |  |  |
Total | 750 |  |  | 750 |  |  |
Accumulated Depreciation | 0 |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 750 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |
Unimproved Land [Member] | Badger Hills - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,050 |  |  |
Buildings & Improvements |  |  |  | 0 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 354 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,404 |  |  |
Buildings & Improvements |  |  |  | 0 |  |  |
Total | 1,404 |  |  | 1,404 |  |  |
Accumulated Depreciation | 0 |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 1,404 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |
Unimproved Land [Member] | Creekside Crossing - Bismarck, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 3,577 |  |  |
Buildings & Improvements |  |  |  | 0 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 693 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 4,270 |  |  |
Buildings & Improvements |  |  |  | 0 |  |  |
Total | 4,270 |  |  | 4,270 |  |  |
Accumulated Depreciation | 0 |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 4,270 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |
Unimproved Land [Member] | Grand Forks Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 2,798 |  |  |
Buildings & Improvements |  |  |  | 0 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 2 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 2,800 |  |  |
Buildings & Improvements |  |  |  | 0 |  |  |
Total | 2,800 |  |  | 2,800 |  |  |
Accumulated Depreciation | 0 |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 2,800 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |
Unimproved Land [Member] | Minot 1525 24th Ave SW - Minot, ND [Member] |  |  |  |  |  |  |
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 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |
Unimproved Land [Member] | Rapid City Unimproved- Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |  |
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 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |
Unimproved Land [Member] | Weston - Weston, WI [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 0 |  |  |
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 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | 0 |  |  |  |  |  |
Wholly Owned Properties [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Total | 1,358,529 | 1,369,893 | 1,090,362 | 1,669,764 | 1,358,529 | 1,369,893 | 1,090,362
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,358,529 | 1,369,893 | 1,090,362 |  |  |  |
Improvements and Other | 15,065 | 34,761 | 31,007 |  |  |  |
Total Additions | 1,742,926 | 1,466,219 | 1,406,449 |  |  |  |
Cost of real estate sold | (46,001) | (21,601) | (1,305) |  |  |  |
Impairment charge | (15,192) | (51,401) | 0 |  |  |  |
Write down of asset and accumulated depreciation on impaired assets | (8,597) | (7,144) | 0 |  |  |  |
Transfers | 0 | (24,156) | (26,373) |  |  |  |
Other | (3,372) | (3,388) | (8,878) |  |  |  |
Balance at close of year | 1,669,764 | 1,358,529 | 1,369,893 |  |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Write down of asset and accumulated depreciation on impaired assets | (8,597) | (7,144) | 0 |  |  |  |
Development in Progress [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Total | 0 | 51,681 | 153,994 | 0 | 0 | $ 51,681 | $ 153,994
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 | 51,681 | 153,994 |  |  |  |
Improvements and Other | 0 | 7,762 | 48,109 |  |  |  |
Transfers | 0 | 0 | 1,734 |  |  |  |
Development placed in service | 0 | (59,443) | (152,156) |  |  |  |
Balance at close of year | 0 | 0 | 51,681 |  |  |  |
Multi-Family Residential [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 505,618 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 135,906 |  |  |
Buildings & Improvements |  |  |  | 1,289,330 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 181,185 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 157,150 |  |  |
Buildings & Improvements |  |  |  | 1,449,271 |  |  |
Total | 1,606,421 |  |  | 1,606,421 |  |  |
Accumulated Depreciation | (294,477) |  |  | (294,477) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 1,606,421 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 294,477 |  |  | 294,477 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | 294,477 |  |  |  |  |  |
Multi-Family Residential [Member] | 71 France - Edina, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 56,000 |  |  |
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 |  |  |  | 62 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 4,721 |  |  |
Buildings & Improvements |  |  |  | 61,824 |  |  |
Total | 66,545 |  |  | 66,545 |  |  |
Accumulated Depreciation | (5,731) |  |  | (5,731) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 66,545 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 5,731 |  |  | 5,731 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 5,731 |  |  |  |  |  |
Multi-Family Residential [Member] | 71 France - Edina, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | 71 France - Edina, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Alps Park - Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 3,618 |  |  |
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 |  |  |  | 356 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 333 |  |  |
Buildings & Improvements |  |  |  | 5,861 |  |  |
Total | $ 6,194 |  |  | 6,194 |  |  |
Accumulated Depreciation | (898) |  |  | (898) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 6,194 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 898 |  |  | 898 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 898 |  |  |  |  |  |
Multi-Family Residential [Member] | Alps Park - Rapid City, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Alps Park - Rapid City, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Arbors - S Sioux City, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 3,562 |  |  |
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 |  |  |  | 2,375 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,048 |  |  |
Buildings & Improvements |  |  |  | 8,302 |  |  |
Total | $ 9,350 |  |  | 9,350 |  |  |
Accumulated Depreciation | (2,966) |  |  | (2,966) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 9,350 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,966 |  |  | 2,966 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,966 |  |  |  |  |  |
Multi-Family Residential [Member] | Arbors - S Sioux City, NE [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Arbors - S Sioux City, NE [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Arcata - Golden Valley, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 98 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 2,089 |  |  |
Buildings & Improvements |  |  |  | 31,133 |  |  |
Total | $ 33,222 |  |  | 33,222 |  |  |
Accumulated Depreciation | (4,177) |  |  | (4,177) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 33,222 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 4,177 |  |  | 4,177 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 4,177 |  |  |  |  |  |
Multi-Family Residential [Member] | Arcata - Golden Valley, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Arcata - Golden Valley, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Ashland - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 5,193 |  |  |
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 |  |  |  | 268 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 795 |  |  |
Buildings & Improvements |  |  |  | 7,783 |  |  |
Total | $ 8,578 |  |  | 8,578 |  |  |
Accumulated Depreciation | (1,492) |  |  | (1,492) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 8,578 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,492 |  |  | 1,492 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,492 |  |  |  |  |  |
Multi-Family Residential [Member] | Ashland - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Ashland - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | 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 |  |  |  | 275 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,629 |  |  |
Buildings & Improvements |  |  |  | 34,336 |  |  |
Total | $ 35,965 |  |  | 35,965 |  |  |
Accumulated Depreciation | (2,354) |  |  | (2,354) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 35,965 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,354 |  |  | 2,354 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,354 |  |  |  |  |  |
Multi-Family Residential [Member] | Avalon Cove - Rochester, MN | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Avalon Cove - Rochester, MN | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Boulder Court - Eagan, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 3,003 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,503 |  |  |
Buildings & Improvements |  |  |  | 8,065 |  |  |
Total | $ 9,568 |  |  | 9,568 |  |  |
Accumulated Depreciation | (3,290) |  |  | (3,290) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 9,568 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,290 |  |  | 3,290 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,290 |  |  |  |  |  |
Multi-Family Residential [Member] | Boulder Court - Eagan, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Boulder Court - Eagan, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Brookfield Village - Topeka, KS [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 4,920 |  |  |
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 |  |  |  | 1,885 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 874 |  |  |
Buildings & Improvements |  |  |  | 8,218 |  |  |
Total | $ 9,092 |  |  | 9,092 |  |  |
Accumulated Depreciation | (3,144) |  |  | (3,144) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 9,092 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,144 |  |  | 3,144 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,144 |  |  |  |  |  |
Multi-Family Residential [Member] | Brookfield Village - Topeka, KS [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Brookfield Village - Topeka, KS [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Canyon Lake - Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 2,677 |  |  |
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 |  |  |  | 2,130 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 397 |  |  |
Buildings & Improvements |  |  |  | 5,996 |  |  |
Total | $ 6,393 |  |  | 6,393 |  |  |
Accumulated Depreciation | (2,555) |  |  | (2,555) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 6,393 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,555 |  |  | 2,555 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,555 |  |  |  |  |  |
Multi-Family Residential [Member] | Canyon Lake - Rapid City, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Canyon Lake - Rapid City, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | 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 |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,600 |  |  |
Buildings & Improvements |  |  |  | 33,400 |  |  |
Total | $ 35,000 |  |  | 35,000 |  |  |
Accumulated Depreciation | 0 |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 35,000 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 0 |  |  |  |  |  |
Multi-Family Residential [Member] | Cardinal Point - Grand Forks, ND | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Cardinal Point - Grand Forks, ND | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | 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 |  |  |  | 66 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,586 |  |  |
Buildings & Improvements |  |  |  | 16,775 |  |  |
Total | $ 18,361 |  |  | 18,361 |  |  |
Accumulated Depreciation | (1,196) |  |  | (1,196) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 18,361 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,196 |  |  | 1,196 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,196 |  |  |  |  |  |
Multi-Family Residential [Member] | Cascade Shores - Rochester, MN | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Cascade Shores - Rochester, MN | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Castlerock - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 6,222 |  |  |
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 |  |  |  | 2,359 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,022 |  |  |
Buildings & Improvements |  |  |  | 6,937 |  |  |
Total | $ 7,959 |  |  | 7,959 |  |  |
Accumulated Depreciation | (3,587) |  |  | (3,587) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 7,959 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,587 |  |  | 3,587 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,587 |  |  |  |  |  |
Multi-Family Residential [Member] | Castlerock - Billings, MT [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Castlerock - Billings, MT [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Chateau I & II - Minot, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 880 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 322 |  |  |
Buildings & Improvements |  |  |  | 20,917 |  |  |
Total | $ 21,239 |  |  | 21,239 |  |  |
Accumulated Depreciation | (3,216) |  |  | (3,216) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 21,239 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,216 |  |  | 3,216 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,216 |  |  |  |  |  |
Multi-Family Residential [Member] | Chateau I & II - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Chateau I & II - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Cimarron Hills - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 4,470 |  |  |
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 |  |  |  | 4,700 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,494 |  |  |
Buildings & Improvements |  |  |  | 13,500 |  |  |
Total | $ 14,994 |  |  | 14,994 |  |  |
Accumulated Depreciation | (6,287) |  |  | (6,287) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 14,994 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 6,287 |  |  | 6,287 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 6,287 |  |  |  |  |  |
Multi-Family Residential [Member] | Cimarron Hills - Omaha, NE [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Cimarron Hills - Omaha, NE [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Colonial Villa - Burnsville, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 9,090 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 2,906 |  |  |
Buildings & Improvements |  |  |  | 20,100 |  |  |
Total | $ 23,006 |  |  | 23,006 |  |  |
Accumulated Depreciation | (8,380) |  |  | (8,380) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 23,006 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 8,380 |  |  | 8,380 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 8,380 |  |  |  |  |  |
Multi-Family Residential [Member] | Colonial Villa - Burnsville, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Colonial Villa - Burnsville, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Colony - Lincoln, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 12,453 |  |  |
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 |  |  |  | 1,428 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,708 |  |  |
Buildings & Improvements |  |  |  | 16,965 |  |  |
Total | $ 18,673 |  |  | 18,673 |  |  |
Accumulated Depreciation | (3,197) |  |  | (3,197) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 18,673 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,197 |  |  | 3,197 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,197 |  |  |  |  |  |
Multi-Family Residential [Member] | Colony - Lincoln, NE [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Colony - Lincoln, NE [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Commons at Southgate - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 26,094 |  |  |
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 |  |  |  | 1,136 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 6,268 |  |  |
Buildings & Improvements |  |  |  | 48,325 |  |  |
Total | $ 54,593 |  |  | 54,593 |  |  |
Accumulated Depreciation | (7,026) |  |  | (7,026) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 54,593 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 7,026 |  |  | 7,026 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 7,026 |  |  |  |  |  |
Multi-Family Residential [Member] | Commons at Southgate - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Commons at Southgate - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Cottage West Twin Homes - Sioux Falls, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 3,387 |  |  |
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 |  |  |  | 597 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,072 |  |  |
Buildings & Improvements |  |  |  | 4,255 |  |  |
Total | $ 5,327 |  |  | 5,327 |  |  |
Accumulated Depreciation | (813) |  |  | (813) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 5,327 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 813 |  |  | 813 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 813 |  |  |  |  |  |
Multi-Family Residential [Member] | Cottage West Twin Homes - Sioux Falls, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Cottage West Twin Homes - Sioux Falls, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Cottonwood - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 14,848 |  |  |
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 |  |  |  | 5,411 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,597 |  |  |
Buildings & Improvements |  |  |  | 22,242 |  |  |
Total | $ 23,839 |  |  | 23,839 |  |  |
Accumulated Depreciation | (9,318) |  |  | (9,318) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 23,839 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 9,318 |  |  | 9,318 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 9,318 |  |  |  |  |  |
Multi-Family Residential [Member] | Cottonwood - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Cottonwood - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Country Meadows - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 6,161 |  |  |
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 |  |  |  | 1,736 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 569 |  |  |
Buildings & Improvements |  |  |  | 9,467 |  |  |
Total | $ 10,036 |  |  | 10,036 |  |  |
Accumulated Depreciation | (4,834) |  |  | (4,834) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 10,036 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 4,834 |  |  | 4,834 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 4,834 |  |  |  |  |  |
Multi-Family Residential [Member] | Country Meadows - Billings, MT [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Country Meadows - Billings, MT [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Crestview - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 3,576 |  |  |
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 |  |  |  | 2,206 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 600 |  |  |
Buildings & Improvements |  |  |  | 6,131 |  |  |
Total | $ 6,731 |  |  | 6,731 |  |  |
Accumulated Depreciation | (3,737) |  |  | (3,737) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 6,731 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,737 |  |  | 3,737 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,737 |  |  |  |  |  |
Multi-Family Residential [Member] | Crestview - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Crestview - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Crown Colony - Topeka, KS [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 7,614 |  |  |
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 |  |  |  | 3,742 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,148 |  |  |
Buildings & Improvements |  |  |  | 13,170 |  |  |
Total | $ 14,318 |  |  | 14,318 |  |  |
Accumulated Depreciation | (6,016) |  |  | (6,016) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 14,318 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 6,016 |  |  | 6,016 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 6,016 |  |  |  |  |  |
Multi-Family Residential [Member] | Crown Colony - Topeka, KS [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Crown Colony - Topeka, KS [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | 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 |  |  |  | 224 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 436 |  |  |
Buildings & Improvements |  |  |  | 11,646 |  |  |
Total | $ 12,082 |  |  | 12,082 |  |  |
Accumulated Depreciation | (780) |  |  | (780) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 12,082 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 780 |  |  | 780 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 780 |  |  |  |  |  |
Multi-Family Residential [Member] | Crystal Bay - Rochester, MN | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Crystal Bay - Rochester, MN | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Cypress Court - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 12,400 |  |  |
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 |  |  |  | 222 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,607 |  |  |
Buildings & Improvements |  |  |  | 19,077 |  |  |
Total | $ 20,684 |  |  | 20,684 |  |  |
Accumulated Depreciation | (2,857) |  |  | (2,857) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 20,684 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,857 |  |  | 2,857 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,857 |  |  |  |  |  |
Multi-Family Residential [Member] | Cypress Court - St. Cloud, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Cypress Court - St. Cloud, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Dakota Commons - Williston, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 823 |  |  |
Buildings & Improvements |  |  |  | 3,210 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 24 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 823 |  |  |
Buildings & Improvements |  |  |  | 3,234 |  |  |
Total | $ 4,057 |  |  | 4,057 |  |  |
Accumulated Depreciation | (169) |  |  | (169) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 4,057 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 169 |  |  | 169 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 169 |  |  |  |  |  |
Multi-Family Residential [Member] | Dakota Commons - Williston, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Dakota Commons - Williston, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Deer Ridge - Jamestown, ND |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 11,201 |  |  |
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 |  |  |  | 175 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 733 |  |  |
Buildings & Improvements |  |  |  | 24,282 |  |  |
Total | $ 25,015 |  |  | 25,015 |  |  |
Accumulated Depreciation | (2,642) |  |  | (2,642) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 25,015 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,642 |  |  | 2,642 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,642 |  |  |  |  |  |
Multi-Family Residential [Member] | Deer Ridge - Jamestown, ND | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Deer Ridge - Jamestown, ND | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Dylan - Denver Co [Member] |  |  |  |  |  |  |
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 |  |  |  | 77,216 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 158 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 12,155 |  |  |
Buildings & Improvements |  |  |  | 77,374 |  |  |
Total | $ 89,529 |  |  | 89,529 |  |  |
Accumulated Depreciation | (1,184) |  |  | (1,184) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 89,529 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,184 |  |  | 1,184 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,184 |  |  |  |  |  |
Multi-Family Residential [Member] | Dylan - Denver Co [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Dylan - Denver Co [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Evergreen - Isanti, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 1,874 |  |  |
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 |  |  |  | 364 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,141 |  |  |
Buildings & Improvements |  |  |  | 5,876 |  |  |
Total | $ 7,017 |  |  | 7,017 |  |  |
Accumulated Depreciation | (1,361) |  |  | (1,361) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 7,017 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,361 |  |  | 1,361 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,361 |  |  |  |  |  |
Multi-Family Residential [Member] | Evergreen - Isanti, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Evergreen - Isanti, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Forest Park - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 7,119 |  |  |
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 |  |  |  | 8,203 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,459 |  |  |
Buildings & Improvements |  |  |  | 13,133 |  |  |
Total | $ 14,592 |  |  | 14,592 |  |  |
Accumulated Depreciation | (7,370) |  |  | (7,370) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 14,592 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 7,370 |  |  | 7,370 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 7,370 |  |  |  |  |  |
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |  |
Multi-Family Residential [Member] | Forest Park - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | French Creek - Rochester, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 146 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 207 |  |  |
Buildings & Improvements |  |  |  | 4,875 |  |  |
Total | $ 5,082 |  |  | 5,082 |  |  |
Accumulated Depreciation | (313) |  |  | (313) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 5,082 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 313 |  |  | 313 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 313 |  |  |  |  |  |
Multi-Family Residential [Member] | French Creek - Rochester, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | French Creek - Rochester, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Gables Townhomes - Sioux Falls, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 1,371 |  |  |
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 |  |  |  | 237 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 397 |  |  |
Buildings & Improvements |  |  |  | 2,110 |  |  |
Total | $ 2,507 |  |  | 2,507 |  |  |
Accumulated Depreciation | (396) |  |  | (396) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 2,507 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 396 |  |  | 396 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 396 |  |  |  |  |  |
Multi-Family Residential [Member] | Gables Townhomes - Sioux Falls, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Gables Townhomes - Sioux Falls, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Gardens - Grand Forks, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 109 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 528 |  |  |
Buildings & Improvements |  |  |  | 8,801 |  |  |
Total | $ 9,329 |  |  | 9,329 |  |  |
Accumulated Depreciation | (770) |  |  | (770) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 9,329 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 770 |  |  | 770 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 770 |  |  |  |  |  |
Multi-Family Residential [Member] | Gardens - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Gardens - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Grand Gateway - St. Cloud, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 1,860 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 941 |  |  |
Buildings & Improvements |  |  |  | 8,819 |  |  |
Total | $ 9,760 |  |  | 9,760 |  |  |
Accumulated Depreciation | (2,003) |  |  | (2,003) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 9,760 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,003 |  |  | 2,003 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,003 |  |  |  |  |  |
Multi-Family Residential [Member] | Grand Gateway - St. Cloud, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Grand Gateway - St. Cloud, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | GrandeVille at Cascade Lake - Rochester, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 1,551 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 5,065 |  |  |
Buildings & Improvements |  |  |  | 51,852 |  |  |
Total | $ 56,917 |  |  | 56,917 |  |  |
Accumulated Depreciation | (4,343) |  |  | (4,343) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 56,917 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 4,343 |  |  | 4,343 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 4,343 |  |  |  |  |  |
Multi-Family Residential [Member] | GrandeVille at Cascade Lake - Rochester, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | GrandeVille at Cascade Lake - Rochester, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Greenfield - Omaha, NE [Member] |  |  |  |  |  |  |
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 |  |  |  | 1,314 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 868 |  |  |
Buildings & Improvements |  |  |  | 5,146 |  |  |
Total | $ 6,014 |  |  | 6,014 |  |  |
Accumulated Depreciation | (1,604) |  |  | (1,604) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 6,014 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,604 |  |  | 1,604 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,604 |  |  |  |  |  |
Multi-Family Residential [Member] | Greenfield - Omaha, NE [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Greenfield - Omaha, NE [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Heritage Manor - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 3,375 |  |  |
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 |  |  |  | 3,227 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 666 |  |  |
Buildings & Improvements |  |  |  | 9,932 |  |  |
Total | $ 10,598 |  |  | 10,598 |  |  |
Accumulated Depreciation | (4,886) |  |  | (4,886) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 10,598 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 4,886 |  |  | 4,886 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 4,886 |  |  |  |  |  |
Multi-Family Residential [Member] | Heritage Manor - Rochester, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Heritage Manor - Rochester, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Homestead Garden - Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 2,957 |  |  |
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 |  |  |  | 514 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 713 |  |  |
Buildings & Improvements |  |  |  | 14,595 |  |  |
Total | $ 15,308 |  |  | 15,308 |  |  |
Accumulated Depreciation | (1,772) |  |  | (1,772) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 15,308 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,772 |  |  | 1,772 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,772 |  |  |  |  |  |
Multi-Family Residential [Member] | Homestead Garden - Rapid City, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Homestead Garden - Rapid City, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Indian Hills - Sioux City, IA [Member] |  |  |  |  |  |  |
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 |  |  |  | 4,362 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 461 |  |  |
Buildings & Improvements |  |  |  | 7,116 |  |  |
Total | $ 7,577 |  |  | 7,577 |  |  |
Accumulated Depreciation | (2,103) |  |  | (2,103) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 7,577 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,103 |  |  | 2,103 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,103 |  |  |  |  |  |
Multi-Family Residential [Member] | Indian Hills - Sioux City, IA [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Indian Hills - Sioux City, IA [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Kirkwood Manor - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 3,083 |  |  |
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 |  |  |  | 1,832 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 610 |  |  |
Buildings & Improvements |  |  |  | 4,396 |  |  |
Total | $ 5,006 |  |  | 5,006 |  |  |
Accumulated Depreciation | (2,299) |  |  | (2,299) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 5,006 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,299 |  |  | 2,299 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,299 |  |  |  |  |  |
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 12 years |  |  |  |  |  |
Multi-Family Residential [Member] | Kirkwood Manor - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Lakeside Village Lincoln, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 12,307 |  |  |
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 |  |  |  | 1,011 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,315 |  |  |
Buildings & Improvements |  |  |  | 16,748 |  |  |
Total | $ 18,063 |  |  | 18,063 |  |  |
Accumulated Depreciation | (3,075) |  |  | (3,075) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 18,063 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,075 |  |  | 3,075 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,075 |  |  |  |  |  |
Multi-Family Residential [Member] | Lakeside Village Lincoln, NE [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Lakeside Village Lincoln, NE [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Landmark - Grand Forks, ND [Member] |  |  |  |  |  |  |
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 |  |  |  |  | 1,175 |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  |  | 356 |  |
Buildings & Improvements |  |  |  |  | 2,517 |  |
Total | $ 2,873 | 2,873 |  |  | 2,873 |  |
Accumulated Depreciation |  | (1,379) |  |  | (1,379) |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,873 |  |  |  |  |  |
Balance at close of year |  | 2,873 |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year |  | 1,379 |  |  | $ 1,379 |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year |  | $ 1,379 |  |  |  |  |
Multi-Family Residential [Member] | Landmark - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Landmark - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Legacy - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 14,327 |  |  |
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 |  |  |  | 10,396 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 2,257 |  |  |
Buildings & Improvements |  |  |  | 31,228 |  |  |
Total | 33,485 |  |  | 33,485 |  |  |
Accumulated Depreciation | (13,904) |  |  | (13,904) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 33,485 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 13,904 |  |  | 13,904 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 13,904 |  |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |  |
Multi-Family Residential [Member] | Legacy - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Legacy Heights - Bismarck, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 384 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,288 |  |  |
Buildings & Improvements |  |  |  | 14,045 |  |  |
Total | $ 15,333 |  |  | 15,333 |  |  |
Accumulated Depreciation | (1,237) |  |  | (1,237) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 15,333 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,237 |  |  | 1,237 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,237 |  |  |  |  |  |
Multi-Family Residential [Member] | Legacy Heights - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Legacy Heights - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Mariposa - Topeka, KS [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 2,756 |  |  |
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 |  |  |  | 934 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 453 |  |  |
Buildings & Improvements |  |  |  | 5,990 |  |  |
Total | $ 6,443 |  |  | 6,443 |  |  |
Accumulated Depreciation | (2,038) |  |  | (2,038) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 6,443 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,038 |  |  | 2,038 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,038 |  |  |  |  |  |
Multi-Family Residential [Member] | Mariposa - Topeka, KS [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Mariposa - Topeka, KS [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Meadows - Jamestown, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 1,922 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 707 |  |  |
Buildings & Improvements |  |  |  | 6,324 |  |  |
Total | $ 7,031 |  |  | 7,031 |  |  |
Accumulated Depreciation | (2,842) |  |  | (2,842) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 7,031 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,842 |  |  | 2,842 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,842 |  |  |  |  |  |
Multi-Family Residential [Member] | Meadows - Jamestown, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Meadows - Jamestown, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Monticello Crossings - Monticello, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 30,131 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 32 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,734 |  |  |
Buildings & Improvements |  |  |  | 30,163 |  |  |
Total | $ 31,897 |  |  | 31,897 |  |  |
Accumulated Depreciation | (1,742) |  |  | (1,742) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 31,897 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,742 |  |  | 1,742 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,742 |  |  |  |  |  |
Multi-Family Residential [Member] | Monticello Crossings - Monticello, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Monticello Crossings - Monticello, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Monticello Village - Monticello, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 1,053 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 637 |  |  |
Buildings & Improvements |  |  |  | 4,662 |  |  |
Total | $ 5,299 |  |  | 5,299 |  |  |
Accumulated Depreciation | (1,743) |  |  | (1,743) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 5,299 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,743 |  |  | 1,743 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,743 |  |  |  |  |  |
Multi-Family Residential [Member] | Monticello Village - Monticello, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Monticello Village - Monticello, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | North Pointe - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 3,216 |  |  |
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 |  |  |  | 1,290 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 376 |  |  |
Buildings & Improvements |  |  |  | 5,174 |  |  |
Total | $ 5,550 |  |  | 5,550 |  |  |
Accumulated Depreciation | (2,083) |  |  | (2,083) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 5,550 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,083 |  |  | 2,083 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,083 |  |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |  |
Multi-Family Residential [Member] | North Pointe - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Northridge - Bismarck, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 183 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 970 |  |  |
Buildings & Improvements |  |  |  | 7,612 |  |  |
Total | $ 8,582 |  |  | 8,582 |  |  |
Accumulated Depreciation | (841) |  |  | (841) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 8,582 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 841 |  |  | 841 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 841 |  |  |  |  |  |
Multi-Family Residential [Member] | Northridge - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Northridge - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Oakmont Estates - Sioux Falls, SD [Member] |  |  |  |  |  |  |
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 |  |  |  | 1,361 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 705 |  |  |
Buildings & Improvements |  |  |  | 5,916 |  |  |
Total | $ 6,621 |  |  | 6,621 |  |  |
Accumulated Depreciation | (2,438) |  |  | (2,438) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 6,621 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,438 |  |  | 2,438 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,438 |  |  |  |  |  |
Multi-Family Residential [Member] | Oakmont Estates - Sioux Falls, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Oakmont Estates - Sioux Falls, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Oakwood Estates - Sioux Falls, SD [Member] |  |  |  |  |  |  |
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 |  |  |  | 4,741 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 868 |  |  |
Buildings & Improvements |  |  |  | 7,200 |  |  |
Total | $ 8,068 |  |  | 8,068 |  |  |
Accumulated Depreciation | (5,004) |  |  | (5,004) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 8,068 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 5,004 |  |  | 5,004 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 5,004 |  |  |  |  |  |
Multi-Family Residential [Member] | Oakwood Estates - Sioux Falls, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Oakwood Estates - Sioux Falls, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Olympic Village - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 9,933 |  |  |
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 |  |  |  | 3,818 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,824 |  |  |
Buildings & Improvements |  |  |  | 13,599 |  |  |
Total | $ 15,423 |  |  | 15,423 |  |  |
Accumulated Depreciation | (6,454) |  |  | (6,454) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 15,423 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 6,454 |  |  | 6,454 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 6,454 |  |  |  |  |  |
Multi-Family Residential [Member] | Olympic Village - Billings, MT [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Olympic Village - Billings, MT [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Olympik Village - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 3,991 |  |  |
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 |  |  |  | 2,597 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,271 |  |  |
Buildings & Improvements |  |  |  | 8,469 |  |  |
Total | $ 9,740 |  |  | 9,740 |  |  |
Accumulated Depreciation | (2,992) |  |  | (2,992) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 9,740 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,992 |  |  | 2,992 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,992 |  |  |  |  |  |
Multi-Family Residential [Member] | Olympik Village - Rochester, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Olympik Village - Rochester, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Oxbo - St Paul, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 66 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 5,809 |  |  |
Buildings & Improvements |  |  |  | 51,652 |  |  |
Total | $ 57,461 |  |  | 57,461 |  |  |
Accumulated Depreciation | (1,759) |  |  | (1,759) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 57,461 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,759 |  |  | 1,759 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,759 |  |  |  |  |  |
Multi-Family Residential [Member] | Oxbo - St Paul, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Oxbo - St Paul, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Oxbow Park - Sioux Falls, SD [Member] |  |  |  |  |  |  |
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 |  |  |  | 3,707 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 990 |  |  |
Buildings & Improvements |  |  |  | 6,273 |  |  |
Total | $ 7,263 |  |  | 7,263 |  |  |
Accumulated Depreciation | (4,227) |  |  | (4,227) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 7,263 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 4,227 |  |  | 4,227 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 4,227 |  |  |  |  |  |
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |  |
Multi-Family Residential [Member] | Oxbow Park - Sioux Falls, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Park Meadows - Waite Park, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 8,041 |  |  |
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 |  |  |  | 9,686 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 2,025 |  |  |
Buildings & Improvements |  |  |  | 17,903 |  |  |
Total | $ 19,928 |  |  | 19,928 |  |  |
Accumulated Depreciation | (8,722) |  |  | (8,722) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 19,928 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 8,722 |  |  | 8,722 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 8,722 |  |  |  |  |  |
Multi-Family Residential [Member] | Park Meadows - Waite Park, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Park Meadows - Waite Park, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Park Place - Plymouth, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 1,967 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 10,609 |  |  |
Buildings & Improvements |  |  |  | 82,748 |  |  |
Total | $ 93,357 |  |  | 93,357 |  |  |
Accumulated Depreciation | (1,819) |  |  | (1,819) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 93,357 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,819 |  |  | 1,819 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,819 |  |  |  |  |  |
Multi-Family Residential [Member] | Park Place - Plymouth, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Park Place - Plymouth, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Pebble Springs - Bismarck, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 228 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 63 |  |  |
Buildings & Improvements |  |  |  | 920 |  |  |
Total | $ 983 |  |  | 983 |  |  |
Accumulated Depreciation | (459) |  |  | (459) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 983 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 459 |  |  | 459 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 459 |  |  |  |  |  |
Multi-Family Residential [Member] | Pebble Springs - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Pebble Springs - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Pinehurst - Billings, MT [Member] |  |  |  |  |  |  |
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 |  |  |  | 458 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 168 |  |  |
Buildings & Improvements |  |  |  | 1,049 |  |  |
Total | $ 1,217 |  |  | 1,217 |  |  |
Accumulated Depreciation | (434) |  |  | (434) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 1,217 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 434 |  |  | 434 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 434 |  |  |  |  |  |
Multi-Family Residential [Member] | Pinehurst - Billings, MT [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Pinehurst - Billings, MT [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Plaza - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 4,915 |  |  |
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 |  |  |  | 2,864 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 998 |  |  |
Buildings & Improvements |  |  |  | 15,517 |  |  |
Total | $ 16,515 |  |  | 16,515 |  |  |
Accumulated Depreciation | (3,958) |  |  | (3,958) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 16,515 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,958 |  |  | 3,958 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,958 |  |  |  |  |  |
Multi-Family Residential [Member] | Plaza - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Plaza - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Pointe West - Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 2,438 |  |  |
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 |  |  |  | 2,022 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 410 |  |  |
Buildings & Improvements |  |  |  | 5,390 |  |  |
Total | $ 5,800 |  |  | 5,800 |  |  |
Accumulated Depreciation | (3,032) |  |  | (3,032) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 5,800 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,032 |  |  | 3,032 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,032 |  |  |  |  |  |
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |  |
Multi-Family Residential [Member] | Pointe West - Rapid City, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Ponds at Heritage Place - Sartell, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 441 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 410 |  |  |
Buildings & Improvements |  |  |  | 4,990 |  |  |
Total | $ 5,400 |  |  | 5,400 |  |  |
Accumulated Depreciation | (919) |  |  | (919) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 5,400 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 919 |  |  | 919 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 919 |  |  |  |  |  |
Multi-Family Residential [Member] | Ponds at Heritage Place - Sartell, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Ponds at Heritage Place - Sartell, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Prairie Winds - Sioux Falls, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 1,315 |  |  |
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 |  |  |  | 732 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 309 |  |  |
Buildings & Improvements |  |  |  | 2,383 |  |  |
Total | $ 2,692 |  |  | 2,692 |  |  |
Accumulated Depreciation | (1,509) |  |  | (1,509) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 2,692 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,509 |  |  | 1,509 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,509 |  |  |  |  |  |
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |  |
Multi-Family Residential [Member] | Prairie Winds - Sioux Falls, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Quarry Ridge - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 25,662 |  |  |
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 |  |  |  | 2,058 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 2,406 |  |  |
Buildings & Improvements |  |  |  | 31,930 |  |  |
Total | $ 34,336 |  |  | 34,336 |  |  |
Accumulated Depreciation | (7,649) |  |  | (7,649) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 34,336 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 7,649 |  |  | 7,649 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 7,649 |  |  |  |  |  |
Multi-Family Residential [Member] | Quarry Ridge - Rochester, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Quarry Ridge - Rochester, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Red 20 - Minneapolis, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 22,518 |  |  |
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 |  |  |  | 41 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,908 |  |  |
Buildings & Improvements |  |  |  | 24,149 |  |  |
Total | $ 26,057 |  |  | 26,057 |  |  |
Accumulated Depreciation | (3,361) |  |  | (3,361) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 26,057 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,361 |  |  | 3,361 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,361 |  |  |  |  |  |
Multi-Family Residential [Member] | Red 20 - Minneapolis, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Red 20 - Minneapolis, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Regency Park Estates - St. Cloud, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 7,976 |  |  |
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 |  |  |  | 2,356 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,019 |  |  |
Buildings & Improvements |  |  |  | 12,237 |  |  |
Total | $ 13,256 |  |  | 13,256 |  |  |
Accumulated Depreciation | (2,637) |  |  | (2,637) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 13,256 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,637 |  |  | 2,637 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,637 |  |  |  |  |  |
Multi-Family Residential [Member] | Regency Park Estates - St. Cloud, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Regency Park Estates - St. Cloud, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Renaissance Heights - Williston, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 22,739 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 3,080 |  |  |
Buildings & Improvements |  |  |  | 15,389 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 265 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 3,117 |  |  |
Buildings & Improvements |  |  |  | 15,617 |  |  |
Total | $ 18,734 |  |  | 18,734 |  |  |
Accumulated Depreciation | (826) |  |  | (826) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 18,734 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 826 |  |  | 826 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 826 |  |  |  |  |  |
Multi-Family Residential [Member] | Renaissance Heights - Williston, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Renaissance Heights - Williston, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Ridge Oaks - Sioux City, IA [Member] |  |  |  |  |  |  |
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 |  |  |  | 178 |  |  |
Buildings & Improvements |  |  |  | 4,073 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 2,921 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 307 |  |  |
Buildings & Improvements |  |  |  | 6,865 |  |  |
Total | $ 7,172 |  |  | 7,172 |  |  |
Accumulated Depreciation | (2,999) |  |  | (2,999) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 7,172 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,999 |  |  | 2,999 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,999 |  |  |  |  |  |
Multi-Family Residential [Member] | Ridge Oaks - Sioux City, IA [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Ridge Oaks - Sioux City, IA [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Rimrock West - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 3,092 |  |  |
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 |  |  |  | 2,018 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 516 |  |  |
Buildings & Improvements |  |  |  | 5,321 |  |  |
Total | $ 5,837 |  |  | 5,837 |  |  |
Accumulated Depreciation | (2,425) |  |  | (2,425) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 5,837 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 2,425 |  |  | 2,425 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 2,425 |  |  |  |  |  |
Multi-Family Residential [Member] | Rimrock West - Billings, MT [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Rimrock West - Billings, MT [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | River Ridge - Bismarck, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 870 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 779 |  |  |
Buildings & Improvements |  |  |  | 25,337 |  |  |
Total | $ 26,116 |  |  | 26,116 |  |  |
Accumulated Depreciation | (4,492) |  |  | (4,492) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 26,116 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 4,492 |  |  | 4,492 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 4,492 |  |  |  |  |  |
Multi-Family Residential [Member] | River Ridge - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | River Ridge - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Rocky Meadows - Billings, MT [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 4,795 |  |  |
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 |  |  |  | 1,531 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 802 |  |  |
Buildings & Improvements |  |  |  | 7,111 |  |  |
Total | $ 7,913 |  |  | 7,913 |  |  |
Accumulated Depreciation | (3,849) |  |  | (3,849) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 7,913 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,849 |  |  | 3,849 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,849 |  |  |  |  |  |
Multi-Family Residential [Member] | Rocky Meadows - Billings, MT [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Rocky Meadows - Billings, MT [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Rum River - Isanti, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 3,294 |  |  |
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 |  |  |  | 391 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 864 |  |  |
Buildings & Improvements |  |  |  | 5,193 |  |  |
Total | $ 6,057 |  |  | 6,057 |  |  |
Accumulated Depreciation | (1,543) |  |  | (1,543) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 6,057 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,543 |  |  | 1,543 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,543 |  |  |  |  |  |
Multi-Family Residential [Member] | Rum River - Isanti, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Rum River - Isanti, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Sherwood - Topeka, KS [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 11,439 |  |  |
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 |  |  |  | 5,036 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,996 |  |  |
Buildings & Improvements |  |  |  | 18,866 |  |  |
Total | $ 20,862 |  |  | 20,862 |  |  |
Accumulated Depreciation | (8,743) |  |  | (8,743) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 20,862 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 8,743 |  |  | 8,743 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 8,743 |  |  |  |  |  |
Multi-Family Residential [Member] | Sherwood - Topeka, KS [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Sherwood - Topeka, KS [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Sierra Vista - Sioux Falls, SD [Member] |  |  |  |  |  |  |
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 |  |  |  | 581 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 283 |  |  |
Buildings & Improvements |  |  |  | 2,636 |  |  |
Total | $ 2,919 |  |  | 2,919 |  |  |
Accumulated Depreciation | (571) |  |  | (571) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 2,919 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 571 |  |  | 571 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 571 |  |  |  |  |  |
Multi-Family Residential [Member] | Sierra Vista - Sioux Falls, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Sierra Vista - Sioux Falls, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Silver Springs - Rapid City, SD [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 2,116 |  |  |
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 |  |  |  | 639 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 256 |  |  |
Buildings & Improvements |  |  |  | 3,605 |  |  |
Total | $ 3,861 |  |  | 3,861 |  |  |
Accumulated Depreciation | (448) |  |  | (448) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 3,861 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 448 |  |  | 448 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 448 |  |  |  |  |  |
Multi-Family Residential [Member] | Silver Springs - Rapid City, SD [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Silver Springs - Rapid City, SD [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | South Pointe - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 8,018 |  |  |
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 |  |  |  | 5,208 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,372 |  |  |
Buildings & Improvements |  |  |  | 13,934 |  |  |
Total | $ 15,306 |  |  | 15,306 |  |  |
Accumulated Depreciation | (7,460) |  |  | (7,460) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 15,306 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 7,460 |  |  | 7,460 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 7,460 |  |  |  |  |  |
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |  |
Multi-Family Residential [Member] | South Pointe - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Southpoint - Grand Forks, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 166 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 633 |  |  |
Buildings & Improvements |  |  |  | 10,002 |  |  |
Total | $ 10,635 |  |  | 10,635 |  |  |
Accumulated Depreciation | (1,302) |  |  | (1,302) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 10,635 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,302 |  |  | 1,302 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,302 |  |  |  |  |  |
Multi-Family Residential [Member] | Southpoint - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Southpoint - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Southwind - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 5,125 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 400 |  |  |
Buildings & Improvements |  |  |  | 5,034 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 3,553 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 825 |  |  |
Buildings & Improvements |  |  |  | 8,162 |  |  |
Total | $ 8,987 |  |  | 8,987 |  |  |
Accumulated Depreciation | (4,680) |  |  | (4,680) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 8,987 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 4,680 |  |  | 4,680 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 4,680 |  |  |  |  |  |
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Life on which depreciation in latest income statement is computed | 24 years |  |  |  |  |  |
Multi-Family Residential [Member] | Southwind - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Sunset Trail - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 7,581 |  |  |
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 |  |  |  | 3,239 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 720 |  |  |
Buildings & Improvements |  |  |  | 15,669 |  |  |
Total | $ 16,389 |  |  | 16,389 |  |  |
Accumulated Depreciation | (7,108) |  |  | (7,108) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 16,389 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 7,108 |  |  | 7,108 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 7,108 |  |  |  |  |  |
Multi-Family Residential [Member] | Sunset Trail - Rochester, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Sunset Trail - Rochester, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Thomasbrook - Lincoln, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 5,574 |  |  |
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 |  |  |  | 5,139 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,642 |  |  |
Buildings & Improvements |  |  |  | 14,403 |  |  |
Total | $ 16,045 |  |  | 16,045 |  |  |
Accumulated Depreciation | (6,178) |  |  | (6,178) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 16,045 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 6,178 |  |  | 6,178 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 6,178 |  |  |  |  |  |
Multi-Family Residential [Member] | Thomasbrook - Lincoln, NE [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Thomasbrook - Lincoln, NE [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Valley Park - Grand Forks, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 3,607 |  |  |
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 |  |  |  | 3,950 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,193 |  |  |
Buildings & Improvements |  |  |  | 7,188 |  |  |
Total | $ 8,381 |  |  | 8,381 |  |  |
Accumulated Depreciation | (3,719) |  |  | (3,719) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 8,381 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,719 |  |  | 3,719 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,719 |  |  |  |  |  |
Multi-Family Residential [Member] | Valley Park - Grand Forks, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Valley Park - Grand Forks, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Villa West - Topeka, KS [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 11,523 |  |  |
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 |  |  |  | 1,664 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 2,226 |  |  |
Buildings & Improvements |  |  |  | 16,788 |  |  |
Total | $ 19,014 |  |  | 19,014 |  |  |
Accumulated Depreciation | (3,177) |  |  | (3,177) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 19,014 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,177 |  |  | 3,177 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,177 |  |  |  |  |  |
Multi-Family Residential [Member] | Villa West - Topeka, KS [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Villa West - Topeka, KS [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Village Green - Rochester, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 1,047 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 359 |  |  |
Buildings & Improvements |  |  |  | 3,218 |  |  |
Total | $ 3,577 |  |  | 3,577 |  |  |
Accumulated Depreciation | (1,281) |  |  | (1,281) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 3,577 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,281 |  |  | 1,281 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,281 |  |  |  |  |  |
Multi-Family Residential [Member] | Village Green - Rochester, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Village Green - Rochester, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Westend - Denver CO [Member] |  |  |  |  |  |  |
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 |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 25,525 |  |  |
Buildings & Improvements |  |  |  | 102,180 |  |  |
Total | $ 127,705 |  |  | 127,705 |  |  |
Accumulated Depreciation | (501) |  |  | (501) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 127,705 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 501 |  |  | 501 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 501 |  |  |  |  |  |
Multi-Family Residential [Member] | Westend - Denver CO [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Westend - Denver CO [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | West Stonehill - Waite Park, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 7,865 |  |  |
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 |  |  |  | 7,593 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,810 |  |  |
Buildings & Improvements |  |  |  | 16,889 |  |  |
Total | $ 18,699 |  |  | 18,699 |  |  |
Accumulated Depreciation | (9,013) |  |  | (9,013) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 18,699 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 9,013 |  |  | 9,013 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 9,013 |  |  |  |  |  |
Multi-Family Residential [Member] | West Stonehill - Waite Park, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | West Stonehill - Waite Park, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Westwood Park - Bismarck, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 1,841 |  |  |
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 |  |  |  | 2,043 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 292 |  |  |
Buildings & Improvements |  |  |  | 3,776 |  |  |
Total | $ 4,068 |  |  | 4,068 |  |  |
Accumulated Depreciation | (1,987) |  |  | (1,987) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 4,068 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 1,987 |  |  | 1,987 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 1,987 |  |  |  |  |  |
Multi-Family Residential [Member] | Westwood Park - Bismarck, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Westwood Park - Bismarck, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Whispering Ridge - Omaha, NE [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 20,844 |  |  |
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 |  |  |  | 1,542 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 2,418 |  |  |
Buildings & Improvements |  |  |  | 26,687 |  |  |
Total | $ 29,105 |  |  | 29,105 |  |  |
Accumulated Depreciation | (4,407) |  |  | (4,407) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 29,105 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 4,407 |  |  | 4,407 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 4,407 |  |  |  |  |  |
Multi-Family Residential [Member] | Whispering Ridge - Omaha, NE [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Whispering Ridge - Omaha, NE [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Williston Garden - Williston, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 6,283 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,400 |  |  |
Buildings & Improvements |  |  |  | 10,200 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 336 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,445 |  |  |
Buildings & Improvements |  |  |  | 10,491 |  |  |
Total | $ 11,936 |  |  | 11,936 |  |  |
Accumulated Depreciation | (576) |  |  | (576) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 11,936 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 576 |  |  | 576 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 576 |  |  |  |  |  |
Multi-Family Residential [Member] | Williston Garden - Williston, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Williston Garden - Williston, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Winchester - Rochester, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 2,516 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,044 |  |  |
Buildings & Improvements |  |  |  | 7,842 |  |  |
Total | $ 8,886 |  |  | 8,886 |  |  |
Accumulated Depreciation | (3,206) |  |  | (3,206) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 8,886 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,206 |  |  | 3,206 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,206 |  |  |  |  |  |
Multi-Family Residential [Member] | Winchester - Rochester, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Winchester - Rochester, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Woodridge - Rochester, MN [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 5,737 |  |  |
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 |  |  |  | 3,089 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 750 |  |  |
Buildings & Improvements |  |  |  | 8,737 |  |  |
Total | $ 9,487 |  |  | 9,487 |  |  |
Accumulated Depreciation | (4,663) |  |  | (4,663) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 9,487 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 4,663 |  |  | 4,663 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 4,663 |  |  |  |  |  |
Multi-Family Residential [Member] | Woodridge - Rochester, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Woodridge - Rochester, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Wholly Owned Properties [Member] |  |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Additions | $ 369,332 | $ 61,565 | $ 285,080 |  |  |  |
Other - Mixed Use [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 6,522 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 389 |  |  |
Buildings & Improvements |  |  |  | 17,319 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 4,947 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 598 |  |  |
Buildings & Improvements |  |  |  | 22,057 |  |  |
Total | 22,655 |  |  | 22,655 |  |  |
Accumulated Depreciation | (4,046) |  |  | (4,046) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 22,655 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 4,046 |  |  | 4,046 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | 4,046 |  |  |  |  |  |
Other - Mixed Use [Member] | 71 France - Edina, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 774 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 0 |  |  |
Buildings & Improvements |  |  |  | 6,653 |  |  |
Total | 6,653 |  |  | 6,653 |  |  |
Accumulated Depreciation | (397) |  |  | (397) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 6,653 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 397 |  |  | 397 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 397 |  |  |  |  |  |
Other - Mixed Use [Member] | 71 France - Edina, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | 71 France - Edina, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Oxbo - St Paul, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 3,471 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 54 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 0 |  |  |
Buildings & Improvements |  |  |  | 3,525 |  |  |
Total | $ 3,525 |  |  | 3,525 |  |  |
Accumulated Depreciation | (113) |  |  | (113) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 3,525 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 113 |  |  | 113 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 113 |  |  |  |  |  |
Other - Mixed Use [Member] | Oxbo - St Paul, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Oxbo - St Paul, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Plaza - Minot, ND [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 6,522 |  |  |
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 | (3,226) |  |  | (3,226) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 9,597 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,226 |  |  | 3,226 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,226 |  |  |  |  |  |
Other - Mixed Use [Member] | Plaza - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Plaza - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Red 20 - Minneapolis, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 355 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 0 |  |  |
Buildings & Improvements |  |  |  | 2,880 |  |  |
Total | $ 2,880 |  |  | 2,880 |  |  |
Accumulated Depreciation | (310) |  |  | (310) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 2,880 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 310 |  |  | 310 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 310 |  |  |  |  |  |
Other - Mixed Use [Member] | Red 20 - Minneapolis, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Red 20 - Minneapolis, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] |  |  |  |  |  |  |
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 |  |  |  | 6,112 |  |  |
Buildings & Improvements |  |  |  | 24,240 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 10,336 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 6,214 |  |  |
Buildings & Improvements |  |  |  | 34,474 |  |  |
Total | $ 40,688 |  |  | 40,688 |  |  |
Accumulated Depreciation | (12,801) |  |  | (12,801) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 40,688 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 12,801 |  |  | 12,801 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | 12,801 |  |  |  |  |  |
Other - Commercial [Member] | Bloomington 2000 W 94th Street - Bloomington, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 2,133 |  |  |
Buildings & Improvements |  |  |  | 1,864 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 2,133 |  |  |
Buildings & Improvements |  |  |  | 1,864 |  |  |
Total | 3,997 |  |  | 3,997 |  |  |
Accumulated Depreciation | 0 |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 3,997 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 0 |  |  |  |  |  |
Other - Commercial [Member] | Bloomington 2000 W 94th Street - Bloomington, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Bloomington 2000 W 94th Street - Bloomington, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Dakota West Plaza - Minot , ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 30 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 106 |  |  |
Buildings & Improvements |  |  |  | 509 |  |  |
Total | $ 615 |  |  | 615 |  |  |
Accumulated Depreciation | (173) |  |  | (173) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 615 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 173 |  |  | 173 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 173 |  |  |  |  |  |
Other - Commercial [Member] | Dakota West Plaza - Minot , ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Dakota West Plaza - Minot , ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Fresenius - Duluth, MN [Member] |  |  |  |  |  |  |
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 |  |  |  | 50 |  |  |
Buildings & Improvements |  |  |  | 1,520 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 2 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 50 |  |  |
Buildings & Improvements |  |  |  | 1,522 |  |  |
Total | $ 1,572 |  |  | 1,572 |  |  |
Accumulated Depreciation | (547) |  |  | (547) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 1,572 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 547 |  |  | 547 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 547 |  |  |  |  |  |
Other - Commercial [Member] | Fresenius - Duluth, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Fresenius - Duluth, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Minot 1400 31st Ave - Minot, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 4,422 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 1,038 |  |  |
Buildings & Improvements |  |  |  | 10,553 |  |  |
Total | $ 11,591 |  |  | 11,591 |  |  |
Accumulated Depreciation | (5,334) |  |  | (5,334) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 11,591 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 5,334 |  |  | 5,334 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 5,334 |  |  |  |  |  |
Other - Commercial [Member] | Minot 1400 31st Ave - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Minot 1400 31st Ave - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Minot 2505 16th Street SW - Minot, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 298 |  |  |
Buildings & Improvements |  |  |  | 1,724 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 296 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 298 |  |  |
Buildings & Improvements |  |  |  | 2,020 |  |  |
Total | $ 2,318 |  |  | 2,318 |  |  |
Accumulated Depreciation | (544) |  |  | (544) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 2,318 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 544 |  |  | 544 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 544 |  |  |  |  |  |
Other - Commercial [Member] | Minot 2505 16th Street SW - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Minot 2505 16th Street SW - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Minot Arrowhead - Minot, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 100 |  |  |
Buildings & Improvements |  |  |  | 3,216 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 5,586 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 176 |  |  |
Buildings & Improvements |  |  |  | 8,726 |  |  |
Total | $ 8,902 |  |  | 8,902 |  |  |
Accumulated Depreciation | (3,191) |  |  | (3,191) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 8,902 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,191 |  |  | 3,191 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,191 |  |  |  |  |  |
Other - Commercial [Member] | Minot Arrowhead - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Minot Arrowhead - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Minot IPS - Minot, ND [Member] |  |  |  |  |  |  |
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 | (3,012) |  |  | (3,012) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 6,368 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 3,012 |  |  | 3,012 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 3,012 |  |  |  |  |  |
Other - Commercial [Member] | Minot IPS - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Minot IPS - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Minot Southgate Retail - Minot, ND [Member] |  |  |  |  |  |  |
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 |  |  |  | 889 |  |  |
Buildings & Improvements |  |  |  | 1,036 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 889 |  |  |
Buildings & Improvements |  |  |  | 1,036 |  |  |
Total | $ 1,925 |  |  | 1,925 |  |  |
Accumulated Depreciation | 0 |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 1,925 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 0 |  |  |  |  |  |
Other - Commercial [Member] | Minot Southgate Retail - Minot, ND [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Minot Southgate Retail - Minot, ND [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] | Woodbury 1865 Woodlane - Woodbury, MN [Member] |  |  |  |  |  |  |
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 | 0 |  |  | 0 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 3,400 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 0 |  |  | 0 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 0 |  |  |  |  |  |
Other - Commercial [Member] | Woodbury 1865 Woodlane - Woodbury, MN [Member] | Minimum [Member] |  |  |  |  |  |  |
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 [Member] | Woodbury 1865 Woodlane - Woodbury, MN [Member] | Maximum [Member] |  |  |  |  |  |  |
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 [Member] |  |  |  |  |  |  |
Real Estate And Accumulated Depreciation [Abstract] |  |  |  |  |  |  |
Encumbrances |  |  |  | 512,140 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 142,407 |  |  |
Buildings & Improvements |  |  |  | 1,330,889 |  |  |
Costs capitalized subsequent to acquisition |  |  |  | 196,468 |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract] |  |  |  |  |  |  |
Land |  |  |  | 163,962 |  |  |
Buildings & Improvements |  |  |  | 1,505,802 |  |  |
Total | $ 1,669,764 |  |  | 1,669,764 |  |  |
Accumulated Depreciation | (311,324) |  |  | (311,324) |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] |  |  |  |  |  |  |
Balance at close of year | 1,669,764 |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of year | 311,324 |  |  | $ 311,324 |  |  |
Deductions during year [Abstract] |  |  |  |  |  |  |
Balance at close of year | $ 311,324 |  |  |  |  |  |

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