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Note 13 - Treasury Stock and Repurchase Program (Tables)
 12 Months Ended
Apr. 30, 2021
Notes Tables  
Class of Treasury Stock [Table Text Block]
($ in thousands except for cost per share)
  
Shares
    
Cost Assigned
    
Average Cost
per Share
    
Aggregate Purchase Price Remaining under the Program
  
Balance as of April 30, 2018
    
308,380
     $
4,135
     $
13.41
     $
255
  
Purchases effected in open market
    
28,059
     $
608
     $
21.68
     $
-
  
Balance as of April 30, 2019
    
336,439
     $
4,743
     $
14.10
     $
1,438
  
Purchases effected in open market
    
46,840
     $
1,214
     $
25.91
     $
-
  
Balance as of April 30, 2020
    
383,279
     $
5,957
     $
15.54
     $
2,000
  
Purchases effected in open market (1)
    
53,551
     $
1,526
     $
28.50
     $
-
  
Balance as of April 30, 2021
    
436,830
     $
7,483
     $
17.13
     $
474