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Note 7 - Federal, State and Local Income Taxes - Schedule of Components of Deferred Tax Asset and Deferred Tax Liability (Details) - USD ($)
Apr. 30, 2017
Apr. 30, 2016
Total federal tax benefit $ 349,000 $ 432,000
Total federal tax liability 18,725,000 20,683,000
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  
Deferred tax liability, long term 18,725,000 20,683,000
Domestic Tax Authority [Member]    
Unrealized gains on securities available-for-sale (249,000) (68,000)
Capital loss carryforward 86,000
Operating lease exit obligation 151,000 58,000
Deferred professional fees 17,000 77,000
Deferred charges 402,000 250,000
Total federal tax benefit 321,000 403,000
Depreciation and amortization 454,000 1,812,000
Other (45,000) 8,000
Total federal tax liability 17,532,000 18,880,000
Deferred Tax Liabilities, Deferred Gain on Deconsolidation of Subsidiary Noncurrent 17,742,000 17,679,000
Deferred Tax Assets, Deferred Non Cash Postemployment Compensation, Noncurrent (619,000) (619,000)
Deferred tax liability, long term 17,532,000 18,880,000
State and Local Jurisdiction [Member]    
Total federal tax benefit 28,000 29,000
Other - deferred charges 28,000 29,000
Depreciation and amortization 31,000 174,000
Deferred professional fees (2,000) (15,000)
Total federal tax liability 1,193,000 1,803,000
Deferred Tax Liabilities, Deferred Gain on Deconsolidation of Subsidiary Noncurrent 1,206,000 1,704,000
Deferred Tax Assets, Deferred Non Cash Postemployment Compensation, Noncurrent (42,000) (60,000)
Deferred tax liability, long term $ 1,193,000 $ 1,803,000