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Note J - Weighted Average Shares Outstanding (Tables)
 12 Months Ended
Apr. 30, 2017
Notes Tables  
Schedule of Weighted Average Number of Shares [Table Text Block]
    Years Ended April 30,
    2017   2016   2015
             
Weighted average shares outstanding-basic    
7,854,238
      
8,370,478
      
8,617,864
  
Dilutive options and restricted stock    
256,539
      
295,553
      
431,093
  
                         
Weighted average shares outstanding-diluted    
8,110,777
      
8,666,031
      
9,048,957
  
                         
Antidilutive securities not included:                        
Options    
359,250
      
325,125
      
76,250