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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, Identified Intangible Assets and Liabilities (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2016 | Oct. 31, 2015 | Apr. 30, 2016
Identified Intangible Assets and Liabilities and Goodwill [Abstract] |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 0 | $ 1,300,000 |
Addition to intangible liabilities |  |  | $ 0 | $ 101,000 |
Weighted average lives of intangible assets acquired |  |  | 0 years | 29 days |
Identified intangible assets (included in intangible assets) [Abstract] |  |  |  |  |
Gross carrying amount | $ 6,103,000 |  | $ 6,103,000 |  | $ 8,088,000
Accumulated amortization | (5,261,000) |  | (5,261,000) |  | (6,230,000)
Net carrying amount | 842,000 |  | 842,000 |  | 1,858,000
Identified intangible liabilities (included in other liabilities) [Abstract] |  |  |  |  |
Gross carrying amount | 157,000 |  | 157,000 |  | 159,000
Accumulated amortization | (65,000) |  | (65,000) |  | (55,000)
Net carrying amount | 92,000 |  | 92,000 |  | $ 104,000
Amortization of above and below market leases | 4,000 | $ 4,000 | 9,000 | $ 11,000 |
Amortization of all other identified intangible assets | 321,000 | $ 331,000 | 995,000 | $ 523,000 |
Estimated annual amortization of acquired below-market leases, net of acquired above-market leases [Abstract] |  |  |  |  |
2018 | (11,000) |  | (11,000) |  |
2019 | (20,000) |  | (20,000) |  |
2020 | (16,000) |  | (16,000) |  |
2021 | (13,000) |  | (13,000) |  |
2022 | (6,000) |  | (6,000) |  |
Estimated annual amortization [Abstract] |  |  |  |  |
2018 | 269,000 |  | 269,000 |  |
2019 | 170,000 |  | 170,000 |  |
2020 | 104,000 |  | 104,000 |  |
2021 | 78,000 |  | 78,000 |  |
2022 | $ 25,000 |  | $ 25,000 |  |

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