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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Preferred Stock
Convertible Preferred Stock
Common Stock
Additional Paid-In Capital
Retained Earnings
Treasury Stock
Other Comprehensive Gain (Loss)
Total
Balance at Mar. 31, 2009 $ 9 $ 23   $ 75,156    $ (220) $ 74,968
Balance (in shares) at Mar. 31, 2009 3 22,687           
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock from exercise of stock options     735        735
Issuance of common stock from exercise of stock options (in shares)   102           
Issuance of restricted stock, net               
Issuance of restricted stock, net (in shares)   201           
Share based compensation     1,594        1,594
Tax benefit related to stock options exercised     299        299
Dividends declared       (6,853)      (6,853)
Repurchased and retired shares               
Repurchased and retired shares (in shares)               
Deferred tax adjustment related to resticted stock and stock options               
Allocation of retirement of repurchased shares of additional paid in capital and retained earnings               
Net income       26,002    26,002 26,002
Net Change in unrealized gain on short term investments               
Net Change in unrealized gain on long term investments            112 112
Total comprehensive income            26,114  
Balance at Mar. 31, 2010 9 23 2,628 94,305    (108) 96,857
Balance (in shares) at Mar. 31, 2010 3 22,990           
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock from exercise of stock options     340        340
Issuance of common stock from exercise of stock options (in shares)   46           
Issuance of restricted stock, net               
Issuance of restricted stock, net (in shares)   86           
Share based compensation     2,171        2,171
Tax benefit related to stock options exercised               
Dividends declared       (10,822)      (10,822)
Repurchased and retired shares   (1) (12,246)        (12,247)
Repurchased and retired shares (in shares)   (791)           
Deferred tax adjustment related to resticted stock and stock options     (132)        (132)
Allocation of retirement of repurchased shares of additional paid in capital and retained earnings     7,239 (7,239)       
Net income       20,871    20,871 20,871
Net Change in unrealized gain on short term investments            (31) (31)
Net Change in unrealized gain on long term investments            (2) (2)
Total comprehensive income            20,838  
Balance at Mar. 31, 2011 9 22   97,115    (141) 97,005
Balance (in shares) at Mar. 31, 2011 3 22,331           
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock from exercise of stock options               
Issuance of common stock from exercise of stock options (in shares)               
Issuance of restricted stock, net               
Issuance of restricted stock, net (in shares)   91           
Share based compensation     2,246        2,246
Tax benefit related to stock options exercised               
Dividends declared       (10,989)      (10,989)
Repurchased and retired shares   (2) (23,683)        (23,685)
Repurchased and retired shares (in shares)   (2,084)           
Deferred tax adjustment related to resticted stock and stock options     (240)        (240)
Allocation of retirement of repurchased shares of additional paid in capital and retained earnings     21,677 (21,677)       
Net income       16,659    16,659 16,659
Net Change in unrealized gain on short term investments            75 75
Net Change in unrealized gain on long term investments            110 110
Total comprehensive income            16,844  
Balance at Mar. 31, 2012 $ 9 $ 20   $ 81,108    $ 44 $ 81,181
Balance (in shares) at Mar. 31, 2012 3 20,338