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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Identified Intangible Assets and Liabilities (Details) - USD ($) | 3 Months Ended |
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Jul. 31, 2017 | Jul. 31, 2016 | Apr. 30, 2017
Identified Intangible Assets and Liabilities and Goodwill [Abstract] |  |  |
Finite-lived Intangible Assets Acquired | $ 870,000 | $ 0 |
Addition to intangible liabilities | $ 89,000 | $ 0 |
Weighted average lives of intangible assets acquired | 10 months 24 days | 0 years |
Identified intangible assets (included in intangible assets) [Abstract] |  |  |
Gross carrying amount | $ 6,973,000 |  | $ 6,102,000
Accumulated amortization | (5,724,000) |  | (5,444,000)
Net carrying amount | 1,249,000 |  | 658,000
Identified intangible liabilities (included in other liabilities) [Abstract] |  |  |
Gross carrying amount | 246,000 |  | 156,000
Accumulated amortization | (84,000) |  | (76,000)
Net carrying amount | $ 162,000 |  | $ 80,000

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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