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Changes in Stockholders' Equity and Comprehensive Income (Tables)
9 Months Ended
Dec. 31, 2012
Stockholders Equity Note [Abstract]  
Schedule of changes in Stockholders' Equity
 
               
Accumulated
 
   
Additional
              Other  
    Paid-In    
Retained
   
Comprehensive
 
    Capital    
Earnings
   
(Loss) Gain
 
Beginning balance at March 31, 2012:
  $ -     $ 81,108     $ 44  
Share based compensation
    1,496       -       -  
Dividends declared
    -       (29,079 )     -  
Net income
    -       12,563       -  
Repurchased and retired shares
    (3,865 )     -       -  
Deffered tax adjustment related to resticted stock
    (168 )     -       -  
Allocation of retirement of additional paid in capital 
and retained earnings
    2,537       (2,537 )     -  
Net change in unrealized loss on short term 
investments
    -       -       (58 )
Ending balance at December 31, 2012:
  $ -     $ 62,055     $ (14 )
  
Schedule of changes in Comprehensive Income
 
   
Three Months Ended
   
Nine Months Ended
 
   
December 31,
   
December 31,
 
   
2012
   
2011
   
2012
   
2011
 
                                 
Net income
  $ 4,577     $ 3,898     $ 12,563     $ 12,665  
Net change in unrealized (loss) gain 
on short term investments
    (83 )     (7 )     (58 )     61  
Net change in unrealized gain on redemptions 
of long term investments
    -       16       -       90  
Comprehensive income
  $ 4,494     $ 3,907     $ 12,505     $ 12,816