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Note 11 - Treasury Stock and Repurchase Program (Tables)
 9 Months Ended
Jan. 31, 2017
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, 2016 (1)(2)
    
243,411
    $
3,040
    $
12.49
    $
1,350
 
Purchases effected in open market during the quarters ended:
                                
July 31, 2016 (2)
    
32,714
    $
535
    $
12.95
    $
815
 
October 31, 2016 (2)
    
8,747
    $
146
    $
16.68
    $
669
 
January 31, 2017 (2)
    
-
    $
-
    $
-
    $
-
 
Balance as of January 31, 2017
    
284,872
    $
3,721
    $
13.06
    $
669