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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

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