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Note J - Weighted Average Shares Outstanding (Details) - Weighted average shares of common stock outstanding
12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Weighted average shares of common stock outstanding [Abstract]      
Weighted average shares outstanding-basic 9,111,851 9,793,616 10,861,403
Dilutive options and restricted stock 457,851 362,739 226,840
Weighted average shares outstanding-diluted 9,569,702 10,156,355 11,088,243
Antidilutive securities not included:      
Options 40,000 27,500 556,000