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Note 13 - Treasury Stock and Repurchase Program (Tables)
 12 Months Ended
Apr. 30, 2017
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, 2014 (1)
    
182,071
    $
2,122
    $
11.65
    $
2,268
 
Purchases effected in open market (2)
    
8,433
    $
122
    $
14.47
    $
2,146
 
Balance as of April 30, 2015
    
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