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Treasury Stock and Repurchase Program - Components of treasury stock, at cost (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Jul. 31, 2015
Jun. 30, 2015
May. 31, 2015
Jul. 31, 2015
Jul. 31, 2014
Shares          
Balance as of April 30, 2015 [1],[2]     190,504 190,504  
Purchases effected in open market [2] 6,002 1,246 4,989    
Balance as of July 31, 2015 202,741     202,741  
Total Average Cost Assigned          
Balance as of April 30, 2015 [1],[2]     $ 2,244 $ 2,244  
Purchases effected in open market $ 80 [2] $ 16 [2] $ 70 [2] 166 $ 42
Balance as of July 31, 2015 $ 2,410     $ 2,410  
Average Cost per Share          
Balance as of April 30, 2014 [1],[2]     $ 11.78 $ 11.78  
Purchases effected in open market [2] $ 13.41 $ 12.75 $ 13.99    
Balance as of July 31, 2015 $ 11.89     $ 11.89  
Aggregate Purchase Price Remaining Under the Program          
Balance as of April 30, 2015 [1],[2]     $ 2,146 $ 2,146  
Purchases effected in open market [2] $ 1,980 $ 2,060 $ 2,076 1,980  
Balance as of July 31, 2015 $ 1,980     $ 1,980  
[1] Includes 85,219 shares with a total average cost of $1,036,000 that were acquired during the former repurchase program, which was authorized in January 2011 and expired in January 2012; 18,400 shares were acquired prior to the repurchase program authorized in January 2011.
[2] Were acquired during the $3 million repurchase program authorized in September 2012.