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Note 13 - Treasury Stock and Repurchase Program (Tables)
12 Months Ended
Apr. 30, 2018
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, 2015 (1)
   
190,504
    $
2,244
    $
11.78
    $
2,146
 
Purchases effected in open market (2)
   
52,907
    $
796
    $
15.05
    $
1,350
 
Balance as of April 30, 2016
   
243,411
    $
3,040
    $
12.49
    $
1,350
 
Purchases effected in open market (2)
   
44,924
    $
741
    $
16.51
    $
609
 
Balance as of April 30, 2017
   
288,335
    $
3,781
    $
13.11
    $
609
 
Purchases effected in open market (2)
   
20,045
    $
354
    $
17.67
    $
255
 
Balance as of April 30, 2018
   
308,380
    $
4,135
    $
13.41
    $
255