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, 2015	Apr. 30, 2014
Deferred Tax Assets and Liabilities [Line Items]
Deferred tax asset, short term	$ 279us-gaap_DeferredTaxAssetsNetCurrent	$ 364us-gaap_DeferredTaxAssetsNetCurrent
Deferred tax liability, long term	22,223	22,520
Federal tax liability (benefit)
Deferred Tax Assets and Liabilities [Line Items]
Unrealized gains on securities available-for-sale	(116)	(134)
Operating lease deferred obligation	70	70
Deferred professional fees	33	36
Deferred charges	247	327
Deferred tax asset, short term	234	299
Deferred gain on deconsolidation of EAM	17,679	17,679
Deferred non-cash post-employment compensation	(619)	(619)
Depreciation and amortization	2,474	2,416
Other	548	646
Deferred tax liability, long term	20,082	20,122
State and local tax liabilities (benefits)
Deferred Tax Assets and Liabilities [Line Items]
Other	45	65
Deferred tax asset, short term	45	65
Deferred gain on deconsolidation of EAM	1,942	2,181
Deferred non-cash post-employment compensation	(68)	(76)
Depreciation and amortization	271	298
Deferred professional fees	(43)	(5)
Other	39
Deferred tax liability, long term	$ 2,141	$ 2,398

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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Amount of deferred tax liability attributable to taxable temporary differences from unrealized gains on trading securities.

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Amount deferred tax asset attributable to deductible temporary differences from deferred charges, expected to be realized or consumed within one year or operating cycle, if longer.

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Amount of deferred tax asset attributable to deductible temporary differences from deferred non-cash post employment compensation, expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount deferred tax asset attributable to deductible temporary differences from deferred professional fees, expected to be realized or consumed within one year or operating cycle, if longer.

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Amount deferred tax asset attributable to deductible temporary differences from deferred professional fees, expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of deferred tax (asset) liability attributable to deductible temporary differences from depreciation and amortization, expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Represents current potion of deferred tax assets operating lease exit obligation.

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Amount of deferred tax liability attributable to taxable temporary differences from deferred gain on deconsolidation of subsidiary, expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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No definition available.

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