Note H - Weighted Average Shares of Common Stock Outstanding (Details) - shares	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Employee Stock Option [Member]
Antidilutive securities not included:
Antidilutive securities (in shares)	410,500	258,000
Restricted Stock [Member]
Antidilutive securities not included:
Antidilutive securities (in shares)	9,000
Basic (in shares)	7,948,925	8,513,440
Dilutive options and restricted stock (in shares)	236,152	396,157
Weighted average shares outstanding-diluted (in shares)	8,185,077	8,909,597