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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Real Estate Properties (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2017 segment | Apr. 30, 2017 | Aug. 31, 2017 property | Jul. 31, 2018 USD ($) property $ / shares | Jul. 31, 2017 USD ($) $ / shares | Apr. 30, 2016 segment | Apr. 30, 2018 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  | $ 0 | $ 256,000 |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |
Number of reportable segments | segment | 2 |  |  |  |  | 5 |
Net income (loss) available to common shareholders |  |  |  | $ 1,211,000 | $ (13,550,000) |  |
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ (0.11) |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |  |  |  |
Mortgage loans receivable |  |  |  | $ 10,530,000 |  |  | $ 10,329,000
Interest income |  |  |  | 481,000 | $ 21,000 |  |
Principal proceeds on mortgage loans receivable |  |  |  | $ 425,000 | 0 |  |
Service Life [Member] |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |
Depreciation expense |  |  |  |  | 14,400,000 |  |
Net income (loss) available to common shareholders |  |  |  |  | $ (14,400,000) |  |
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares |  |  |  |  | $ (0.11) |  |
Service Life [Member] | Minimum [Member] |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |
Estimated useful lives |  | 20 years |  | 10 years |  |  |
Service Life [Member] | Maximum [Member] |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |
Estimated useful lives |  | 40 years |  | 37 years |  |  |
Property with Previous Nine Year Life [Member] | Service Life [Member] |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |
Estimated useful lives |  | 9 years |  |  |  |  |
Property with Previous Nine Year Life [Member] | Service Life [Member] | Minimum [Member] |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |
Estimated useful lives |  |  |  | 5 years |  |  |
Property with Previous Nine Year Life [Member] | Service Life [Member] | Maximum [Member] |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |
Estimated useful lives |  |  |  | 10 years |  |  |
Fully Depreciated Property [Member] | Service Life [Member] |  |  |  |  |  |  |
CHANGE IN DEPRECIABLE LIVES OF REAL ESTATE ASSETS [Abstract] |  |  |  |  |  |  |
Depreciation expense |  |  |  |  | $ 9,000,000 |  |
Net income (loss) per common share - basic & diluted (in dollars per share) | $ / shares |  |  |  |  | $ (0.07) |  |
Multi-Family Residential [Member] |  |  |  |  |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |  |  |  |
Interest rate |  |  |  | 6.00% |  |  |
Loan commitment |  |  |  |  | $ 16,200,000 |  |
Assets Held for Sale [Member] | Unimproved Land [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Impairment of real estate investments |  |  |  |  | 256,000 |  |
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |  |  |  |
Interest income |  |  |  | $ 0 | $ 544,000 |  |
Discontinued Operations, Disposed of by Sale [Member] | Multi-Family Residential [Member] |  |  |  |  |  |  |
MORTGAGE RECEIVABLE AND NOTES RECEIVABLE |  |  |  |  |  |  |
Number of real estate properties sold | property |  |  | 13 | 13 |  |  |
Interest rate |  |  |  | 5.50% |  |  |
Interest income |  |  |  | $ 202,000 |  |  |
Number of real estate properties released | property |  |  |  | 1 |  |  |

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