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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Properties (Details) $ / shares in Units, shares in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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Apr. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) property | Apr. 30, 2018 USD ($) $ / shares | Jan. 31, 2018 USD ($) $ / shares | Oct. 31, 2017 USD ($) $ / shares | Jul. 31, 2017 USD ($) $ / shares | Apr. 30, 2017 USD ($) $ / shares | Jan. 31, 2017 USD ($) $ / shares | Oct. 31, 2016 USD ($) $ / shares | Jul. 31, 2016 USD ($) $ / shares | Oct. 31, 2017 segment | Jan. 31, 2018 | Apr. 30, 2018 USD ($) property $ / shares | Dec. 31, 2017 | Apr. 30, 2017 USD ($) property $ / shares | Dec. 31, 2016 | Apr. 30, 2016 USD ($) property segment $ / shares shares
BASIS OF PRESENTATION [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in operating partnership (in hundredths) | 88.60% |  | 89.40% |  |  |  | 88.60% |  |  |  |  |  | 89.40% |  | 88.60% |  |
Percentage of general interest partnership (in hundredths) | 100.00% |  | 100.00% |  |  |  | 100.00% |  |  |  |  |  | 100.00% |  | 100.00% |  |
Redemption basis |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
RECENT ACCOUNTING PRONOUNCEMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs capitalized |  |  | $ 411,536 |  |  |  |  |  |  |  |  |  | $ 411,536 |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate investments | $ 1,121,385,000 |  | 1,380,245,000 |  |  |  | $ 1,121,385,000 |  |  |  |  |  | 1,380,245,000 |  | $ 1,121,385,000 |  |
Construction period interest capitalized |  |  |  |  |  |  |  |  |  |  |  |  | 4,000 |  | 431,000 |  | $ 4,900,000
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  | 18,065,000 |  | 57,028,000 |  | $ 5,983,000
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  | 5
Net income |  |  | $ (22,579,000) | $ 134,331,000 | $ 6,360,000 | $ (13,550,000) | $ 27,994,000 | $ 19,172,000 | $ 8,722,000 | $ (24,522,000) |  |  | $ 104,562,000 |  | $ 31,366,000 |  | $ 60,492,000
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares |  |  | $ (0.19) | $ 1.12 | $ 0.05 | $ (0.11) | $ 0.23 | $ 0.16 | $ 0.07 | $ (0.20) |  |  | $ 0.87 |  | $ 0.26 |  | $ 0.49
Held for Sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of year after date of acquisition related to adjustment of real estate preliminary allocations of purchase price |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |
PROPERTY AND EQUIPMENT [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment cost | 2,100,000 |  | $ 2,100,000 |  |  |  | $ 2,100,000 |  |  |  |  |  | $ 2,100,000 |  | $ 2,100,000 |  |
Accumulated depreciation | 1,200,000 |  | 1,300,000 |  |  |  | 1,200,000 |  |  |  |  |  | 1,300,000 |  | 1,200,000 |  |
RESTRICTED CASH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | 27,981,000 |  | 4,225,000 |  |  |  | 27,981,000 |  |  |  |  |  | $ 4,225,000 |  | $ 27,981,000 |  |
INCOME TAXES [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum dividend distribution percentage |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |
Dividend distribution percentage (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  | 90.00% |  | 90.00%
Distribution of federal income tax (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.59% |  | 12.43% |
Distribution of capital gain (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.87% |  | 87.57% |
Distribution made as return of capital (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  | 36.54% |  |  |
Financing Receivable, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold | property |  |  |  |  |  |  |  |  |  |  |  |  | 28 |  |  |  |
Mortgage loans receivable | $ 0 |  | 10,329,000 |  |  |  | $ 0 |  |  |  |  |  | $ 10,329,000 |  | $ 0 |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 1,197,000 |  | 366,000 |  | $ 78,000
Business Combination, Bargain Purchase [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on bargain purchase |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | 0 |  | $ 3,424,000
Buildings and Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Buildings and Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 37 years |  |  |  |
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Renovations and Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Renovations and Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Minot, ND - property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,900,000 |  |
Multi-family Residential Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 16 |  |
Multi-family Residential Properties [Member] | Grand Forks, North Dakota [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,200,000 |  |  |  |
Multi-family Residential Properties [Member] | Williston, ND - property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Multi-family Residential Properties [Member] | Williston, ND - property 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] | Williston, ND - property 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,800,000 |  |
Multi-family Residential Properties [Member] | Williston, ND - property 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Land [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 2 |  | 2
Land [Member] | Grand Forks, North Dakota [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |
Land [Member] | Minot, ND - property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Land [Member] | Bismark, North Dakota - First Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  | $ 256,000 |  |  |  |
Land [Member] | Bismark, North Dakota [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Land [Member] | Bismark, North Dakota - Second Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  | $ 709,000 |  |  |  |
Land [Member] | Williston, ND - property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  | 428,000 |  | $ 2,800,000 |  |
Interest in joint venture | 70.00% |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  | 70.00% |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Land [Member] | River Falls Wisconsin [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 162,000
Industrial [Member] | Bloomington, Minnesota [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 |  |  |  |
Industrial [Member] | Woodbury, Minnesota [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  | 922,000 |  |  |  |
Retail Site [Member] | Minot, ND - property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  | 630,000 |  |  |  |
Office [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Commercial Healthcare [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Multi-Family Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8
Financing Receivable, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on mortgages payable |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |
Loan commitment |  |  |  |  |  | $ 16,200,000 |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  | 15,500,000 |  |  |  |  |  |  |  |  |  | $ 15,500,000 |  |  |  |
Multi-Family Residential [Member] | St Cloud Minnesota [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,900,000
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8
Office Property [Member] | Eden Prairie Minnesota [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 440,000
Assets Held for Sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Assets Held for Sale [Member] | Multi-family Residential Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |
Assets Held for Sale [Member] | Multi-family Residential Properties [Member] | Minot, ND - property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |
Assets Held for Sale [Member] | Retail Site [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Assets Held for Sale [Member] | Commercial Healthcare [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held for Sale [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Assets Held for Sale [Member] | Medical Property [Member] | Sartell, Minnesota, Healthcare Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 440,000
Financing Receivable, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | $ 661,000 |  | $ 2,179,000 |  | 2,179,000
Discontinued Operations [Member] | Land [Member] | Grand Chute, Wisconsin, Unimproved Land [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
IMPAIRMENT OF LONG-LIVED ASSETS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000
Discontinued Operations [Member] | Commercial Healthcare [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties classified as discontinued operations | property |  |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |
Discontinued Operations, Disposed of by Sale [Member] | Multi-Family Residential [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties sold | property |  | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans receivable |  | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred gain on sale of properties |  | $ 626,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on mortgages payable |  | 5.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | $ 372,000 |  |  |  |
Service Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 20 years |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Service Life [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 40 years |  |  |  |  |  |  |  |  |  |  | 37 years |  |  |  |  |
Service Life [Member] | Property With Previous Nine Year Life [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service Life [Member] | Property With Previous Nine Year Life [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Service Life [Member] | Property With Previous Nine Year Life [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Service Life [Member] | Fully Depreciated Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  | $ 9,000,000 |  |  |  |  |  |  |  |  |  |  |
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares |  |  |  |  |  | $ (0.07) |  |  |  |  |  |  |  |  |  |  |
Escrow Deposits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RESTRICTED CASH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 4,300,000 |  | $ 4,200,000 |  |  |  | $ 4,300,000 |  |  |  |  |  | $ 4,200,000 |  | 4,300,000 |  |
Tax-Deferred Exchange Proceeds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RESTRICTED CASH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 23,700,000 |  |  |  |  |  | $ 23,700,000 |  |  |  |  |  |  |  | $ 23,700,000 |  |
187 unit - Avalon Cove - Rochester, MN [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Bargain Purchase [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total acquisition costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,300,000
Form of consideration, cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000
Shares exchanged (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.5
Shares exchanged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,800,000
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.09
Gain on bargain purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,400,000

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