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Note H - Income Taxes (Details) - Reconciliation of Income Tax to Statutory Rate (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Reconciliation of Income Tax to Statutory Rate [Abstract]      
Tax provision at statutory rate $ 17,729 $ 18,473 $ 15,766
State taxes, net of federal benefit 829 1,125 980
Other, net (67) 194 85
$ 18,491 $ 19,792 $ 16,831