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Note J - Weighted Average Shares Outstanding (Tables)
 12 Months Ended
Apr. 30, 2020
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
    Years Ended April 30,
    2020   2019   2018
             
Weighted average shares outstanding-basic    
6,630,023
      
6,810,879
      
7,232,014
  
Dilutive options and restricted stock    
315,629
      
260,889
      
209,344
  
                         
Weighted average shares outstanding-diluted    
6,945,652
      
7,071,768
      
7,441,358
  
                         
Antidilutive securities not included:                        
Options    
118,750
      
60,000
      
229,000
  
Restricted Stock    
7,224
      
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