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Note 13 - Treasury Stock and Repurchase Program (Tables)
 12 Months Ended
Apr. 30, 2016
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, 2013 (1)
     123,572     $ 1,572     $ 12.72     $ 2,818  
Purchases effected in open market (2)
     58,499     $ 550     $ 9.41     $ 2,268  
Balance as of April 30, 2014
     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