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Note 7 - Schedule of Components of Deferred Tax Asset and Deferred Tax Liability (Details) - USD ($)
Apr. 30, 2016
Apr. 30, 2015
Domestic Tax Authority [Member]    
Unrealized gains on securities available-for-sale $ (68,000) $ (57,000)
Capital loss carryforward 86,000
Operating lease exit obligation 58,000 70,000
Deferred professional fees 77,000 34,000
Deferred charges 250,000 263,000
Total federal tax benefit 403,000 310,000
Deferred Tax Liabilities, Deferred Gain on Deconsolidation of Subsidiary Noncurrent 17,679,000 17,679,000
Deferred Tax Assets, Deferred Non Cash Postemployment Compensation, Noncurrent (619,000) (619,000)
Depreciation and amortization 1,812,000 2,435,000
Other 8,000 401,000
Total federal tax liability 18,880,000 19,896,000
Deferred tax liability, long term 18,880,000 19,896,000
State and Local Jurisdiction [Member]    
Total federal tax benefit 29,000 46,000
Other - deferred charges 29,000 46,000
Deferred Tax Liabilities, Deferred Gain on Deconsolidation of Subsidiary Noncurrent 1,704,000 1,970,000
Deferred Tax Assets, Deferred Non Cash Postemployment Compensation, Noncurrent (60,000) (69,000)
Depreciation and amortization 174,000 271,000
Total federal tax liability 1,803,000 2,168,000
Deferred professional fees (15,000) (4,000)
Deferred tax liability, long term 1,803,000 2,168,000
Total federal tax benefit 432,000 356,000
Deferred Tax Liabilities, Deferred Gain on Deconsolidation of Subsidiary Noncurrent 50,510,000  
Deferred Tax Assets, Deferred Non Cash Postemployment Compensation, Noncurrent 1,770,000  
Total federal tax liability 20,683,000 22,064,000
Deferred tax liability, long term $ 20,683,000 $ 22,064,000