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Note 8 - Federal, State and Local Income Taxes - Schedule of Components of Deferred Tax Asset and Deferred Tax Liability (Details) - USD ($) $ in Thousands | Jan. 31, 2017 | Apr. 30, 2016
--- | --- | ---
Total federal tax benefit | $ 344 | $ 432
Total federal tax liability | 19,224 | 20,683
Deferred tax liability, long term | 19,224 | 20,683
Domestic Tax Authority [Member] |  |
Unrealized gains on securities available-for-sale | (150) | (68)
Capital loss carryforward |  | 86
Operating lease deferred obligation |  | 58
Deferred professional fees | 17 | 77
Deferred charges | 460 | 250
Total federal tax benefit | 327 | 403
Deferred gain on deconsolidation of EAM | 17,737 | 17,679
Deferred non-cash post-employment compensation | (619) | (619)
Depreciation and amortization | 736 | 1,812
Other | 134 | 8
Total federal tax liability | 17,988 | 18,880
Other | 134 | 8
Deferred tax liability, long term | 17,988 | 18,880
State and Local Jurisdiction [Member] |  |
Total federal tax benefit | 17 | 29
Other | 17 | 29
Deferred gain on deconsolidation of EAM | 1,210 | 1,704
Deferred non-cash post-employment compensation | (42) | (60)
Depreciation and amortization | 70 | 174
Other | (2) | (15)
Total federal tax liability | 1,236 | 1,803
Other | (2) | (15)
Deferred tax liability, long term | $ 1,236 | $ 1,803

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