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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Properties (Details) | 3 Months Ended | 12 Months Ended
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Apr. 30, 2016 USD ($) property shares | Jul. 31, 2015 property | Apr. 30, 2016 USD ($) property item shares | Dec. 31, 2015 | Apr. 30, 2015 USD ($) property | Dec. 31, 2014 | Apr. 30, 2014 USD ($) property
BASIS OF PRESENTATION [Abstract] |  |  |  |  |  |  |
Interest in operating partnership (in hundredths) | 88.10% |  | 88.10% |  | 89.90% |  |
Percentage of general interest partnership (in hundredths) | 100.00% |  | 100.00% |  | 100.00% |  |
Redemption basis |  |  | 1:1 |  |  |  |
Redemptions by limited partner, maximum | item |  |  | 2 |  |  |  |
Number of units to redeem, minimum (in units) | shares | 1,000 |  | 1,000 |  |  |  |
Period to hold the beneficial interest, minimum |  |  | 1 year |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Number of year after date of acquisition related to adjustment of real estate preliminary allocations of purchase price |  |  | 1 year |  |  |  |
Impairment of real estate investments |  |  | $ 5,983,000 |  | $ 6,105,000 |  | $ 44,426,000
Number of impaired properties | property |  |  |  |  |  |  | 15
IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |  |  |
New intangible assets |  |  | 2,200,000 |  | 416,000 |  |
Addition to intangible liabilities |  |  | $ 101,000 |  | $ 0 |  |
Weighted average lives of intangible assets acquired |  |  | 8 months 12 days |  | 6 months |  |
Goodwill book value | $ 1,680,000 |  | $ 1,680,000 |  | $ 1,718,000 |  |
Recognized impairment goodwill |  |  | 0 |  | 0 |  |
Goodwill recognized |  |  |  |  | 852,000 |  |
Goodwill derecognized |  |  | 196,000 |  | 40,000 |  | $ 7,000
PROPERTY AND EQUIPMENT [Abstract] |  |  |  |  |  |  |
Property and equipment cost | 2,100,000 |  | 2,100,000 |  | 2,400,000 |  |
Accumulated depreciation | $ 1,058,000 |  | $ 1,058,000 |  | $ 1,374,000 |  |
INCOME TAXES [Abstract] |  |  |  |  |  |  |
Minimum dividend distribution percentage (in hundredths) |  |  | 90.00% |  |  |  |
Dividend distribution percentage (in hundredths) |  |  | 90.00% |  | 90.00% |  | 90.00%
Distribution of federal income tax (in hundredths) |  |  |  | 36.28% |  | 25.74% |
Distribution of capital gain (in hundredths) |  |  |  | 11.99% |  | 23.09% |
Distribution made as return of capital (in hundredths) |  |  |  | 51.73% |  | 51.17% |
Buildings and Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  | 20 years |  |  |  |
Buildings and Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Estimated useful life of assets (in years) |  |  | 40 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) |  |  | 12 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 |  |  |  |
Multi-family Residential Properties [Member] |  |  |  |  |  |  |
IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |  |  |
Number of real estate properties disposed | property |  |  |  |  | 1 |  |
Multi-Family Residential [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Number of impaired properties | property |  |  | 8 |  |  |  |
Multi-Family Residential [Member] | St Cloud Minnesota Member |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  | $ 1,900,000 |  |  |  |
Number of impaired properties | property |  |  | 8 |  |  |  |
Unimproved Land [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Number of impaired properties | property |  |  | 2 |  | 2 |  |
Unimproved Land [Member] | Grand Chute, Wisconsin, Unimproved Land [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  | $ 1,600,000 |  |  |  |
Unimproved Land [Member] | River Falls Wisconsin Member |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  | $ 162,000 |  |  |  |
Unimproved Land [Member] | Eagan, Minnesota, Unimproved Land [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  | $ 98,000 |  |
Unimproved Land [Member] | Weston, Wisconsin, Unimproved Land [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  | $ 442,000 |  |
Commercial Properties [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Number of impaired properties | property |  |  |  |  | 4 |  |
IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES AND GOODWILL [Abstract] |  |  |  |  |  |  |
Number of real estate properties disposed | property |  |  | 8 |  | 2 |  |
Commercial Healthcare [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Number of impaired properties | property |  |  | 1 |  |  |  |
Industrial [Member] | St. Louis Park, Minnesota, Industrial Property [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  | $ 864,000
Industrial [Member] | Clive, Iowa, Industrial Property [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  | 402,000
Industrial [Member] | Roseville, Minnesota, Industrial Property [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  | 4,800,000
Office [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Number of impaired properties | property |  |  | 1 |  |  |  |
Office [Member] | Golden Valley, Minnesota [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  | 2,100,000
Office [Member] | Bloomington, Minnesota [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  | 329,000
Office [Member] | Edina, Minnesota, Office Property [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  | 835,000
Retail [Member] | Kalispell, Montana, Retail Property [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  | $ 2,100,000 |  |
Retail [Member] | Anoka, Minnesota, Retail Property [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  |  |  | 265,000
Office Property [Member] | Eden Prairie Minnesota Member |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  | $ 440,000 |  |  |  |
Office Property [Member] | Golden Valley, Minnesota [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  | 183,000 |  |
Office Property [Member] | Minneapolis, Minnesota, Office Property [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  | 1,800,000 |  |
Office Property [Member] | Boise, Idaho, Office Property [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  | 1,400,000 |  |
Medical Property [Member] | Sartell, Minnesota, Healthcare Property [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  | 1,900,000 |  |  |  |
Discontinued Operations [Member] |  |  |  |  |  |  |
REAL ESTATE INVESTMENTS [Abstract] |  |  |  |  |  |  |
Impairment of real estate investments |  |  | $ 440,000 |  | $ 1,400,000 |  | $ 36,700,000
Discontinued Operations [Member] | Retail [Member] |  |  |  |  |  |  |
RECLASSIFICATIONS [Abstract] |  |  |  |  |  |  |
Number of real estate properties classified as discontinued operations | property |  | 17 |  |  |  |  |
Discontinued Operations [Member] | Office Property [Member] |  |  |  |  |  |  |
RECLASSIFICATIONS [Abstract] |  |  |  |  |  |  |
Number of real estate properties classified as discontinued operations | property |  | 48 |  |  |  |  |
Discontinued Operations [Member] | Medical Property [Member] |  |  |  |  |  |  |
RECLASSIFICATIONS [Abstract] |  |  |  |  |  |  |
Number of real estate properties classified as discontinued operations | property |  | 1 |  |  |  |  |
Discontinued Operations [Member] | Senior Housing properties [Member] |  |  |  |  |  |  |
RECLASSIFICATIONS [Abstract] |  |  |  |  |  |  |
Number of real estate properties classified as discontinued operations | property | 34 |  |  |  |  |  |
Assets Held for Sale [Member] | Multi-Family Residential [Member] |  |  |  |  |  |  |
REAL ESTATE HELD FOR SALE [Abstract] |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  | 1 |  |  |  |
Assets Held for Sale [Member] | Unimproved Land [Member] |  |  |  |  |  |  |
REAL ESTATE HELD FOR SALE [Abstract] |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  | 3 |  |  |  |
Assets Held for Sale [Member] | Industrial [Member] |  |  |  |  |  |  |
REAL ESTATE HELD FOR SALE [Abstract] |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  | 1 |  |  |  |
Assets Held for Sale [Member] | Office [Member] |  |  |  |  |  |  |
REAL ESTATE HELD FOR SALE [Abstract] |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  |  |  | 1 |  |
Assets Held for Sale [Member] | Medical Property [Member] |  |  |  |  |  |  |
REAL ESTATE HELD FOR SALE [Abstract] |  |  |  |  |  |  |
Number of real estate properties classified as held for sale | property |  |  | 35 |  | 1 |  |

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