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Changes in Stockholders' Equity and Comprehensive Income (Loss) (Tables)
6 Months Ended
Sep. 30, 2015
Stockholders' Equity Note [Abstract]  
Schedule of changes in stockholders' equity
                Accumulated  
    Additional           Other  
    Paid-In     Retained     Comprehensive  
    Capital     Earnings     Loss  
                         
Beginning balance at March 31, 2015:   $ 3,117     $ 72,343     $ (54 )
Share based compensation     777       -       -  
Dividends declared     -       (7,301 )     -  
Tax adjustment related to restricted stock     93       -       -  
Net income     -       10,259       -  
Net change in unrealized gain (loss) on short term investments     -       -       (19 )
Ending balance at September 30, 2015:   $ 3,987     $ 75,301     $ (73 )