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Note H - Weighted Average Shares Outstanding (Tables)
 9 Months Ended
Jan. 31, 2015
Weighted Average Shares Outstanding [Abstract]  
Schedule of Weighted Average Number of Shares [Table Text Block]
    Three Months Ended
January 31, 		  Nine Months Ended
January 31,
    2015   2014   2015   2014
Weighted average shares outstanding-basic     8,587,761       8,917,826       8,636,036       8,984,958  
Dilutive options and restricted stock     448,325       452,809       431,159       464,422  
Weighted average shares outstanding-diluted     9,036,086       9,370,635       9,067,195       9,449,380  
                                 
Antidilutive securities not included:                                
  Options     74,000       80,000       77,667       73,333