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Note H - Weighted Average Shares of Common Stock Outstanding (Details) - shares
3 Months Ended 6 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Employee Stock Option [Member]        
Antidilutive securities not included:        
Options (in shares) 251,000 89,000 254,500 79,500
Restricted Stock [Member]        
Antidilutive securities not included:        
Options (in shares) 9,500 4,750
Basic (in shares) 8,471,918 8,604,003 8,492,679 8,660,173
Dilutive options and restricted stock (in shares) 418,434 360,942 422,577
Weighted average shares outstanding-diluted (in shares) 8,471,918 9,022,437 8,853,621 9,082,750