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Note J - Weighted Average Shares Outstanding (Tables)
12 Months Ended
Apr. 30, 2018
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
    Years Ended April 30,
    2018   2017   2016
             
Weighted average shares outstanding-basic    
7,232,014
     
7,854,238
     
8,370,478
 
Dilutive options and restricted stock    
209,344
     
256,539
     
295,553
 
                         
Weighted average shares outstanding-diluted    
7,441,358
     
8,110,777
     
8,666,031
 
                         
Antidilutive securities not included:                        
Options    
229,000
     
359,250
     
325,125