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Federal, State and Local Income Taxes - Tax effect of temporary differences in deferred tax asset and deferred tax liability (Details 1) - USD ($)
$ in Thousands
Jul. 31, 2015
Apr. 30, 2015
Deferred Tax Assets and Liabilities [Line Items]    
Deferred tax asset, short term $ 404 $ 356
Deferred tax liability, long term 21,856 22,064
Federal tax liability (benefit)    
Deferred Tax Assets and Liabilities [Line Items]    
Unrealized gains on securities available-for-sale (7) (57)
Operating lease deferred obligation 70 70
Deferred professional fees 76 34
Deferred charges 229 263
Deferred tax asset, short term 368 310
Deferred gain on deconsolidation of EAM 17,705 17,679
Deferred non-cash post-employment compensation (619) (619)
Depreciation and amortization 2,418 2,435
Other 448 401
Deferred tax liability, long term 19,952 19,896
State and local tax liabilities (benefits)    
Deferred Tax Assets and Liabilities [Line Items]    
Other 36 46
Deferred tax asset, short term 36 46
Deferred gain on deconsolidation of EAM 1,735 1,970
Deferred non-cash post-employment compensation (61) (69)
Depreciation and amortization 237 271
Deferred professional fees (7) (4)
Deferred tax liability, long term $ 1,904 $ 2,168