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Note J - Weighted Average Shares Outstanding (Tables)
 12 Months Ended
Apr. 30, 2019
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
    Years Ended April 30,
    2019   2018   2017
             
Weighted average shares outstanding-basic    
6,810,879
      
7,232,014
      
7,854,238
  
Dilutive options and restricted stock    
260,889
      
209,344
      
256,539
  
                         
Weighted average shares outstanding-diluted    
7,071,768
      
7,441,358
      
8,110,777
  
                         
Antidilutive securities not included:                        
Options    
60,000
      
229,000
      
359,250