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Changes in Shareholders' Equity and Comprehensive Income: (Tables)
3 Months Ended
Jun. 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     463       -  
Dividends declared     -       (3,885 )
Net income     -       6,594  
Ending balance at June 30, 2016:   $ 5,334     $ 81,004