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Note 11 - Treasury Stock and Repurchase Program (Tables)
 3 Months Ended
Jul. 31, 2019
Notes Tables  
Class of Treasury Stock [Table Text Block]
(in thousands except for shares and cost per share)
  
Shares
    
Total Average
Cost Assigned
    
Average Cost per
Share
    
Aggregate Purchase Price Remaining Under the Program
  
Balance as of April 30, 2019 (1), (2), (3)
    
336,439
     $
4,743
     $
14.10
     $
1,438
  
Purchases effected in open market during the quarters ended (2):
                                
                                 
May 31, 2019
    
2,409
      
56
      
23.21
      
1,382
  
June 30, 2019
    
1,448
      
36
      
24.98
      
1,346
  
July 31, 2019
    
-
      
-
      
-
      
1,346
  
Balance as of July 31, 2019 (2) (3)
    
340,296
     $
4,835
     $
14.21
     $
1,346