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Note H - Weighted Average Shares Outstanding (Tables)
6 Months Ended
Oct. 31, 2017
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
    Three Months Ended
October 31,
  Six Months Ended
October 31,
    2017   2016   2017   2016
Weighted average shares outstanding-basic    
7,354,499
     
7,833,061
     
7,451,673
     
7,890,993
 
Dilutive options and restricted stock    
200,527
     
303,900
     
209,995
     
270,026
 
Weighted average shares outstanding-diluted    
7,555,026
     
8,136,961
     
7,661,668
     
8,161,019
 
Antidilutive securities not included:                                
Options    
314,750
     
343,250
     
326,250
     
376,875
 
Restricted stock    
-
     
10,000
     
17,000
     
9,500