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Treasury Stock and Repurchase Program - Components of treasury stock, at cost (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2014
Jul. 31, 2014
Oct. 31, 2014
Oct. 31, 2013
Shares        
Balance as of April 30, 2014   182,071 [1],[2],[3] 182,071 [1],[2],[3]  
Purchases effected in open market 2,008 3,053    
Balance as of October 31, 2014 187,132   187,132  
Total Average Cost Assigned        
Balance as of April 30, 2014   $ 2,122 [1],[2],[3] $ 2,122 [1],[2],[3]  
Purchases effected in open market 29 42 71 349
Balance as of October 31, 2014 2,193   2,193  
Average Cost per Share        
Balance as of April 30, 2014   $ 11.65 [1],[2],[3] $ 11.65 [1],[2],[3]  
Purchases effected in open market $ 14.44 $ 13.76    
Balance as of October 31, 2014 $ 11.72   $ 11.72  
Aggregate Purchase Price Remaining Under the Program        
Balance as of April 30, 2014   2,268 [1],[2],[3] 2,268 [1],[2],[3]  
Purchases effected in open market $ 2,197 $ 2,226 $ 2,197  
[1] Includes 18,400 shares with a total average cost of $354,000 that were acquired prior to the repurchase program authorized in January 2011.
[2] 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.
[3] Includes 78,452 shares with a total average cost of $732,000 that were acquired during the current repurchase program authorized in September 2012.