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Changes in Shareholders' Equity and Comprehensive Income: (Tables)
6 Months Ended
Sep. 30, 2016
Stockholders' Equity Note [Abstract]  
Schedule of changes in stockholders' equity
    Additional        
    Paid-In     Retained  
    Capital     Earnings  
             
Beginning balance at March 31, 2016:   $ 4,871     $ 78,295  
Share based compensation     946       -  
Dividends declared     -       (7,786 )
Excess tax benefits related to restricted stock     115       -  
Net income     -       11,493  
                 
Ending balance at September 30, 2016:   $ 5,932     $ 82,002