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Note 2 - Schedule of Cash Flow Supplemental Disclosures (Details) - USD ($)
12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
State and local income tax payments $ 188,000 $ 238,000 $ 114,000
Federal income tax payments to the Parent $ 3,545,000 $ 3,366,000 $ 2,254,000