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Note J - Weighted Average Shares Outstanding (Tables)
12 Months Ended
Apr. 30, 2016
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
    Years Ended April 30,
    2016   2015   2014
Weighted average shares outstanding-basic     8,370,478       8,617,864       8,930,592  
Dilutive options and restricted stock     295,553       431,093       461,075  
                         
Weighted average shares outstanding-diluted     8,666,031       9,048,957       9,391,667  
                         
Antidilutive securities not included:                        
Options     325,125       76,250       77,500