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Note 7 - Schedule of Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
U.S. statutory federal rate 35.00% 35.00% 35.00%
State and local income taxes, net of federal income tax benefit (3.39%) (0.15%) 0.84%
Effect of dividends received deductions (0.41%) (0.40%) (0.33%)
Write off goodwill (1.62%)
Domestic production tax credit (0.33%) (0.44%) (0.58%)
Other, net (3.72%) (1.87%) (1.43%)
Effective income tax rate 27.15% 30.52% 33.50%