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Changes in Shareholders' Equity and Comprehensive Income: (Tables)
9 Months Ended
Dec. 31, 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     1,444       -  
Dividends declared     -       (11,686 )
Tax adjustment related to restricted stock     115       -  
Net income     -       16,316  
                 
Ending balance at December 31, 2016:   $ 6,430     $ 82,925