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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
Apr. 30, 2015
Apr. 30, 2014
Deferred Tax Assets and Liabilities [Line Items]    
Deferred tax asset, short term $ 356 $ 364
Deferred gain on deconsolidation of EAM 50,510  
Deferred non-cash post-employment compensation 1,770  
Deferred tax liability, long term 22,064 22,520
Federal tax benefit (liability)    
Deferred Tax Assets and Liabilities [Line Items]    
Unrealized gains on securities available-for-sale (57) (134)
Operating lease exit obligation 70 70
Deferred professional fees 34 36
Deferred charges 263 327
Deferred tax asset, short term 310 299
Deferred gain on deconsolidation of EAM 17,679 17,679
Deferred non-cash post-employment compensation (619) (619)
Depreciation and amortization 2,435 2,416
Other 401 646
Deferred tax liability, long term 19,896 20,122
State and local tax liabilities (benefits)    
Deferred Tax Assets and Liabilities [Line Items]    
Other - deferred charges 46 65
Deferred tax asset, short term 46 65
Deferred gain on deconsolidation of EAM 1,970 2,181
Deferred non-cash post-employment compensation (69) (76)
Depreciation and amortization 271 298
Deferred professional fees (4) (5)
Deferred tax liability, long term $ 2,168 $ 2,398