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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, Identified Intangible Assets and Liabilities (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Apr. 30, 2016
Identified intangible assets (included in intangible assets) [Abstract] |  |  |
Gross carrying amount | $ 8,088,000 |  | $ 8,088,000
Accumulated amortization | (6,916,000) |  | (6,230,000)
Net carrying amount | 1,172,000 |  | 1,858,000
Identified intangible liabilities (included in other liabilities) [Abstract] |  |  |
Gross carrying amount | 159,000 |  | 159,000
Accumulated amortization | (61,000) |  | (55,000)
Net carrying amount | 98,000 |  | $ 104,000
Amortization of above and below market leases | 5,000 | $ 6,000 |
Amortization of all other identified intangible assets | 675,000 | $ 192,000 |
Estimated annual amortization of acquired below-market leases, net of acquired above-market leases [Abstract] |  |  |
2018 | 5,000 |  |
2019 | (11,000) |  |
2020 | (20,000) |  |
2021 | (16,000) |  |
2022 | (13,000) |  |
Estimated annual amortization [Abstract] |  |  |
2018 | 1,171,000 |  |
2019 | 269,000 |  |
2020 | 170,000 |  |
2021 | 104,000 |  |
2022 | $ 78,000 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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