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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Preferred Stock
Convertible
Common Stock
Additional Paid-In Capital
Retained Earnings
Other Comprehensive Gain (Loss)
Total
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
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 restricted stock     (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
Other comprehensive gain/loss:            
Net Change in unrealized loss on short term investments         (31) (31)
Net Change in unrealized loss on long term investments         (2) (2)
Total comprehensive income         20,838 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 restricted stock, net                  
Issuance of restricted stock, net (in shares)   91        
Share based compensation     2,246     2,246
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 restricted stock     (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
Other comprehensive gain/loss:            
Net Change in unrealized loss on short term investments         75 75
Net Change in unrealized loss on long term investments         110 110
Total comprehensive income         16,844 16,844
Balance at Mar. 31, 2012 9 20   81,108 44 81,181
Balance (in shares) at Mar. 31, 2012 3 20,338        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of restricted stock, net                  
Issuance of restricted stock, net (in shares)   168        
Share based compensation     1,943     1,943
Dividends declared       (32,080)   (32,080)
Repurchased and retired shares     (3,865)     (3,865)
Repurchased and retired shares (in shares)   (397)        
Deferred tax adjustment related to restricted stock     (284)     (284)
Allocation of retirement of repurchased shares of additional paid in capital and retained earnings     2,206 (2,206)    
Net income       17,165 17,165 17,165
Other comprehensive gain/loss:            
Net Change in unrealized loss on short term investments         (46) (46)
Total comprehensive income         17,119 17,119
Balance at Mar. 31, 2013 $ 9 $ 20   $ 63,987 $ (2) $ 64,014
Balance (in shares) at Mar. 31, 2013 3 20,109