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Changes in Stockholders' Equity and Comprehensive Income (Loss)- Summary of Changes in stockholders' equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 75,435  
Net income $ 4,890 $ 4,797 15,149 $ 12,502
Net change in unrealized gain (loss) on short term investments (14) $ (20) (33) $ (13)
Ending balance 80,875   80,875  
Additional Paid-In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     3,117  
Share based compensation     $ 1,189  
Dividends declared      
Tax adjustment related to restricted stock     $ 92  
Net income      
Net change in unrealized gain (loss) on short term investments      
Ending balance 4,398   $ 4,398  
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 72,343  
Share based compensation      
Dividends declared     $ (10,957)  
Tax adjustment related to restricted stock      
Net income     $ 15,149  
Net change in unrealized gain (loss) on short term investments      
Ending balance 76,535   $ 76,535  
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ (54)  
Share based compensation      
Dividends declared      
Tax adjustment related to restricted stock      
Net income      
Net change in unrealized gain (loss) on short term investments     $ (33)  
Ending balance $ (87)   $ (87)