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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, unless otherwise specified
Jan. 31, 2014
Apr. 30, 2013
Deferred Tax Assets and Liabilities [Line Items]    
Deferred tax asset, short term $ 463 $ 227
Deferred tax liability, long term 22,359 21,326
Federal tax liability (benefit)
    
Deferred Tax Assets and Liabilities [Line Items]    
Unrealized gains on securities available-for-sale (110) (136)
Operating lease deferred obligation 70 13
Deferred professional fees 39 49
Deferred charges 227 265
Deferred tax asset, short term 226 191
Deferred gain on deconsolidation of EAM 17,679 17,679
Deferred non-cash post-employment compensation (619) (619)
Depreciation and amortization 2,359 1,642
Other 590 262
Deferred tax liability, long term 20,009 18,964
State and local tax liabilities (benefits)
    
Deferred Tax Assets and Liabilities [Line Items]    
NYC UBT tax credit carryforward 181   
Other 56 36
Deferred tax asset, short term 237 36
Deferred gain on deconsolidation of EAM 2,144 2,243
Deferred non-cash post-employment compensation (75) (79)
Depreciation and amortization 286 208
Deferred professional fees (5) (10)
Deferred tax liability, long term $ 2,350 $ 2,362