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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Involuntary Conversion of Assets(Details) $ / shares in Units, $ in Thousands, shares in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 22, 2016 USD ($) $ / shares shares | Dec. 31, 2013 item | Apr. 30, 2016 USD ($) | Apr. 30, 2015 USD ($) | Apr. 30, 2014 USD ($) | Feb. 29, 2012 property
Unusual or Infrequent Item [Line Items] |  |  |  |  |  |
Total gain on involuntary conversion |  |  |  |  | $ 2,480 |
GAIN ON BARGAIN PURCHASE [Abstract] |  |  |  |  |  |
Gain on bargain purchase |  |  | $ 3,424 |  |  |
187 unit - Avalon Cove - Rochester, MN [Member] |  |  |  |  |  |
GAIN ON BARGAIN PURCHASE [Abstract] |  |  |  |  |  |
Fair value at acquisition | $ 36,000 |  |  |  |  |
Cash consideration | $ 15,000 |  |  |  |  |
Units issued, acquisitions | shares | 2.5 |  |  |  |  |
Value of units issued, acquisitions | $ 17,800 |  |  |  |  |
Share price on acquisition date | $ / shares | $ 7.09 |  |  |  |  |
Gain on bargain purchase | $ 3,000 |  |  |  |  |
2012 Fire [Member] |  |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |  |
Number of buildings destroyed | property |  |  |  |  |  | 1
Proceeds from final settlement |  |  |  |  | 5,100 |
Total gain on involuntary conversion |  |  |  |  | 2,500 |
2013 Fire [Member] |  |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |  |
Total gain on involuntary conversion |  |  |  | $ 0 |  |
Insurance proceeds received for flood clean up costs and redevelopment |  |  |  | $ 6,000 | $ 1,000 |
2013 Fire [Member] | Building One [Member] |  |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |  |
Number of units in building | item |  | 15 |  |  |  |
2013 Fire [Member] | Building Two [Member] |  |  |  |  |  |
Unusual or Infrequent Item [Line Items] |  |  |  |  |  |
Number of units in building | item |  | 57 |  |  |  |

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