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Note 7 - Federal, State and Local Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
U.S. statutory federal rate 35.00% 35.00% 35.00%
State and local income taxes, net of federal income tax benefit (0.88%) (3.39%) (0.15%)
Effect of dividends received deductions (0.33%) (0.41%) (0.40%)
Write off goodwill (1.62%)
Domestic production tax credit (0.17%) (0.33%) (0.44%)
Other, net (0.57%) (3.72%) (1.87%)
Effective Income Tax Rate Reconciliation, Percent 33.05% 27.15% 30.52%