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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