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Note 7 - Federal, State and Local Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Apr. 30, 2023
Apr. 30, 2022
Unrealized gain on securities held for sale $ (178) $ (194)
Deferred tax liability 13,129 13,126
Unrealized gain on securities held for sale 178 194
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 59 77
Unrealized gain on securities held for sale 919 909
Right of Use Asset (174) (188)
Deferred charges (136) (154)
Other (333) (300)
Deferred tax liability 10,632 10,641
Unrealized gain on securities held for sale (919) (909)
State and Local Jurisdiction [Member]    
Deferred gain on deconsolidation of EAM 2,062 2,131
Deferred non-cash post-employment compensation (72) (74)
Depreciation and amortization 125 180
Other 204 54
Deferred tax liability $ 2,497 $ 2,485