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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended | 20 Months Ended |  |
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Dec. 14, 2018 | Apr. 30, 2017 USD ($) shares | Aug. 31, 2017 property | Dec. 31, 2018 USD ($) $ / shares shares | Oct. 31, 2018 USD ($) $ / shares | Jul. 31, 2018 USD ($) $ / shares | Apr. 30, 2018 USD ($) $ / shares shares | Jan. 31, 2018 USD ($) $ / shares | Oct. 31, 2017 USD ($) $ / shares | Jul. 31, 2017 USD ($) $ / shares | Apr. 30, 2017 USD ($) $ / shares shares | Jan. 31, 2017 USD ($) $ / shares | Oct. 31, 2016 USD ($) $ / shares | Jul. 31, 2016 USD ($) $ / shares | Dec. 31, 2018 USD ($) property $ / shares shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2018 USD ($) shares | Apr. 30, 2018 USD ($) property $ / shares shares | Dec. 31, 2017 | Apr. 30, 2017 USD ($) property $ / shares shares | Dec. 31, 2016 | Apr. 30, 2016 USD ($) property $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 27, 2018 shares | Dec. 26, 2018 shares
BASIS OF PRESENTATION [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in operating partnership (in hundredths) |  | 88.60% |  | 89.70% |  |  | 89.40% |  |  |  | 88.60% |  |  |  | 89.70% |  | 89.70% | 89.40% |  | 88.60% |  |  | 89.70% |  |
Percentage of general interest partnership (in hundredths) |  | 100.00% |  | 100.00% |  |  | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% |  | 100.00% | 100.00% |  | 100.00% |  |  | 100.00% |  |
Reverse stock split, conversion ratio | 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares of Beneficial Interest, shares issued (in shares) | shares |  | 12,119,930 |  | 11,942,372 |  |  | 11,952,598 |  |  |  | 12,119,930 |  |  |  | 11,942,372 |  | 11,942,372 | 11,952,598 |  | 12,119,930 |  |  | 11,942,372 | 11,900,000 | 119,400,000
Reverse stock split, units (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 | 13,700,000
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments |  | $ 1,121,385,000 |  | $ 1,289,476,000 |  |  | $ 1,380,245,000 |  |  |  | $ 1,121,385,000 |  |  |  | $ 1,289,476,000 |  | $ 1,289,476,000 | $ 1,380,245,000 |  | $ 1,121,385,000 |  |  | $ 1,289,476,000 |  |
Construction period interest capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 4,000 |  | 431,000 |  | $ 4,900,000 |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,221,000 |  |  | 18,065,000 |  | 57,028,000 |  | 5,983,000 |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  | $ (3,892,000) | $ (6,264,000) | $ 1,211,000 | $ (22,579,000) | $ 134,331,000 | $ 6,360,000 | $ (13,550,000) | $ 27,994,000 | $ 19,172,000 | $ 8,722,000 | $ (24,522,000) | $ (8,945,000) | $ 117,461,000 |  | $ 104,562,000 |  | $ 31,366,000 |  | $ 60,492,000 |  |  |
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares |  |  |  | $ (0.33) | $ (0.52) | $ 0.10 | $ (1.89) | $ 11.22 | $ 0.53 | $ (1.12) | $ 2.33 | $ 1.58 | $ 0.72 | $ (2.02) | $ (0.75) | $ 9.78 |  | $ 8.71 |  | $ 2.58 |  | $ 4.91 |  |  |
HELD FOR SALE [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of year after date of acquisition related to adjustment of real estate preliminary allocations of purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
RESTRICTED CASH [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | 27,981,000 |  | $ 5,464,000 |  |  | $ 4,225,000 |  |  |  | $ 27,981,000 |  |  |  | $ 5,464,000 |  | 5,464,000 | $ 4,225,000 |  | $ 27,981,000 |  |  | 5,464,000 |  |
PROPERTY AND EQUIPMENT [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment cost |  | 2,100,000 |  | 2,200,000 |  |  | 2,100,000 |  |  |  | 2,100,000 |  |  |  | 2,200,000 |  | 2,200,000 | 2,100,000 |  | 2,100,000 |  |  | 2,200,000 |  |
Accumulated depreciation |  | $ 1,200,000 |  | 1,400,000 |  |  | 1,300,000 |  |  |  | $ 1,200,000 |  |  |  | $ 1,400,000 |  | $ 1,400,000 | $ 1,300,000 |  | $ 1,200,000 |  |  | 1,400,000 |  |
INCOME TAXES [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum dividend distribution percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |
Dividend distribution percentage (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  | 90.00% |  | 90.00% |  | 90.00% |  |  |
Distribution of federal income tax (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  | 14.59% |  | 12.43% |  |  |  |
Distribution of capital gain (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.87% |  | 87.57% |  |  |  |
Distribution made as return of capital (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36.54% |  |  |  |  |  |
MORTGAGE LOANS RECEIVABLE AND NOTES RECEIVABLE [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28 |  |  |  |  |  |  |
Mortgage loans receivable |  |  |  | 10,400,000 |  |  | 11,000,000 |  |  |  |  |  |  |  | $ 10,400,000 |  | $ 10,400,000 | $ 11,000,000 |  |  |  |  | $ 10,400,000 |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,168,000 | $ 432,000 |  | 1,197,000 |  | $ 366,000 |  | $ 78,000 |  |  |
Proceeds from collection of loans receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 545,000 |  |  | 0 |  | 0 |  | 0 |  |  |
GAIN ON BARGAIN PURCHASE [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on bargain purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  | $ 0 |  | 0 |  | $ 3,424,000 |  |  |
Buildings and Improvements | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Buildings and Improvements | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37 years |  |  |  |  |  |  |  |  |  |
Furniture, Fixtures and Equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Furniture, Fixtures and Equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Renovations and Improvements | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Renovations and Improvements | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Minot, ND - property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,900,000 |  |  |  |  |
Multi-family Residential Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 16 |  |  |  |  |
Multi-family Residential Properties | Grand Forks, North Dakota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,200,000 |  |  |  |  |  |  |
Multi-family Residential Properties | Williston, ND - property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Multi-family Residential Properties | Williston, ND - property 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,900,000 |  |  |  |  |
Interest in joint venture |  | 70.00% |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |
Multi-family Residential Properties | Williston, ND - property 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,800,000 |  |  |  |  |
Multi-family Residential Properties | Williston, ND - property 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,700,000 |  |  |  |  |
Interest in joint venture |  | 60.00% |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |
Commercial Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 2 |  | 2 |  |  |
Land | Grand Forks, North Dakota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |
Land | Minot, ND - property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Land | Bismark, North Dakota - First Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 256,000 |  |  |  |  |  |  |
Land | Bismark, North Dakota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Land | Bismark, North Dakota - Second Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 709,000 |  |  |  |  |  |  |
Land | Williston, ND - property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 428,000 |  | $ 2,800,000 |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Interest in joint venture |  | 70.00% |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |
Land | River Falls Wisconsin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 162,000 |  |  |
Industrial | Bloomington, Minnesota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  |  |
Industrial | Woodbury, Minnesota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 922,000 |  |  |  |  |  |  |
Retail Site | Minot, ND - property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 630,000 |  |  |  |  |  |  |
Office |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Commercial Healthcare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Multi-Family Residential |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |
MORTGAGE LOANS RECEIVABLE AND NOTES RECEIVABLE [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on mortgages payable |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan commitment |  |  |  |  |  |  |  |  |  | $ 16,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multi-Family Residential | St Cloud Minnesota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900,000 |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |
Office Property | Eden Prairie Minnesota |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 440,000 |  |  |
Assets Held for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HELD FOR SALE [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |
Assets Held for Sale | Multi-family Residential Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HELD FOR SALE [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |
Assets Held for Sale | Multi-family Residential Properties | Minot, ND - property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |
Assets Held for Sale | Retail Site |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HELD FOR SALE [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Assets Held for Sale | Commercial Healthcare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HELD FOR SALE [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Assets Held for Sale | Medical Property | Sartell, Minnesota, Healthcare Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 |  |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 440,000 |  |  |
Discontinued Operations | Land | Grand Chute, Wisconsin, Unimproved Land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MORTGAGE LOANS RECEIVABLE AND NOTES RECEIVABLE [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 661,000 |  | $ 2,179,000 |  | 2,179,000 |  |  |
Discontinued Operations, Disposed of by Sale | Multi-Family Residential |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MORTGAGE LOANS RECEIVABLE AND NOTES RECEIVABLE [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold | property |  |  | 13 |  |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |  |  |  |  |  |  |
Interest rate on mortgages payable |  |  | 5.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 448,000 |  |  | 372,000 |  |  |  |  |  |  |
Number of real estate properties released | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Service Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,300,000 |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (29,300,000) |  |  |  |  |  |  |
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (0.22) |  |  |  |  |  |  |
Service Life | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Service Life | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  | 40 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37 years |  |
Service Life | Property With Previous Nine Year Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service Life | Property With Previous Nine Year Life | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Service Life | Property With Previous Nine Year Life | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Escrow Deposits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RESTRICTED CASH [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | $ 4,300,000 |  | $ 5,500,000 |  |  | $ 4,200,000 |  |  |  | $ 4,300,000 |  |  |  | $ 5,500,000 |  | $ 5,500,000 | $ 4,200,000 |  | 4,300,000 |  |  | $ 5,500,000 |  |
Tax-Deferred Exchange Proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RESTRICTED CASH [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | $ 23,700,000 |  |  |  |  |  |  |  |  | $ 23,700,000 |  |  |  |  |  |  |  |  | $ 23,700,000 |  |  |  |  |
187 unit - Avalon Cove - Rochester, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GAIN ON BARGAIN PURCHASE [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total acquisition costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,300,000 |  |  |
Form of consideration, cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |
Shares exchanged (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |
Shares exchanged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,800,000 |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 70.90 |  |  |
Gain on bargain purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,400,000 |  |  |

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