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Changes in Stockholders' Equity and Comprehensive Income (Tables)
6 Months Ended
Sep. 30, 2012
Stockholders Equity Note [Abstract]  
Schedule of changes in Stockholders' Equity
 
 
               
Accumulated
 
   
Additional
         
Other
 
   
Paid-In
   
Retained
   
Comprehensive
 
   
Capital
   
Earnings
   
Gain
 
                   
 Beginning balance at March 31, 2012:
  $ -     $ 81,108     $ 44  
    Share based compensation
    1,039       -       -  
    Dividends declared
    -       (6,085 )     -  
    Net income
    -       7,986       -  
    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
    2,994       (2,994 )     -  
    Net change in unrealized gain on short term
                       
       investments
    -       -       25  
 Ending balance at September 30, 2012:
  $ -     $ 80,015     $ 69  
Schedule of changes in Comprehensive Income
 
 
   
Three Months Ended
   
Six Months Ended
 
   
September 30,
   
September 30,
 
   
2012
   
2011
   
2012
   
2011
 
                         
Net income
  $ 4,034     $ 3,930     $ 7,986     $ 8,767  
Net change in unrealized gain on short term investments
    16       22       25       68  
Net change in unrealized gain on redemptions
                               
   of long term investments
    -       27       -       74  
Comprehensive income
  $ 4,050     $ 3,979     $ 8,011     $ 8,909