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Changes in Stockholders' Equity and Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Total
Beginning balance at Mar. 31, 2013    $ 63,987 $ (2) $ 64,014
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share based compensation 1,105        
Dividends declared    (9,879)     
Net income    13,446    13,446
Tax adjustment related to restricted stock 123      
Net change in unrealized loss on short term investments      (36) (36)
Ending balance at Dec. 31, 2013 $ 1,228 $ 67,554 $ (38) $ 68,773