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Note 8 - Federal, State and Local Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Oct. 31, 2018
Apr. 30, 2018
Deferred tax liability $ 11,514 $ 11,714
Deferred tax liability 11,514 11,714
Domestic Tax Authority [Member]    
Deferred gain on deconsolidation of EAM 10,664 10,658
Deferred non-cash post-employment compensation (372) (372)
Depreciation and amortization 110 119
Unrealized loss (gain) on securities held for sale 256 208
Deferred charges (336) (331)
Other, asset 223 210
Deferred tax liability 10,545 10,492
Deferred tax liability 10,545 10,492
State and Local Jurisdiction [Member]    
Deferred gain on deconsolidation of EAM 1,028 1,299
Deferred non-cash post-employment compensation (36) (45)
Depreciation and amortization 11 15
Deferred tax liability 969 1,222
Other 34 47
Deferred tax liability $ 969 $ 1,222