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Note 8 - Federal, State and Local Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jul. 31, 2019
Apr. 30, 2019
Deferred tax liability $ 12,722 $ 12,624
Deferred tax liability 12,722 12,624
Domestic Tax Authority [Member]    
Deferred gain on deconsolidation of EAM 10,669 10,669
Deferred non-cash post-employment compensation (372) (372)
Depreciation and amortization 122 130
Unrealized gain on securities held for sale 469 446
Deferred charges (343) (354)
Other (296) (279)
Deferred tax liability 10,249 10,240
Deferred tax liability 10,249 10,240
State and Local Jurisdiction [Member]    
Deferred gain on deconsolidation of EAM 2,619 2,530
Deferred non-cash post-employment compensation (91) (74)
Depreciation and amortization 31 40
Other (86) (112)
Deferred tax liability 2,473 2,384
Deferred tax liability $ 2,473 $ 2,384