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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive (Loss) Income
Retained Earnings
Balance at Dec. 31, 2010 $ 95,365 $ 102 $ 25,164 $ (65) $ 70,164
Balance, shares at Dec. 31, 2010   10,202,000      
Common stock issued on exercise of options, shares   3,000      
Common stock issued on exercise of options 5 0 5 0 0
Stock option compensation expense, net of tax, shares   0      
Stock option compensation expense, net of tax 332 0 332 0 0
Tax benefit of stock option exercises 13 0 13 0 0
Repurchase of common stock, shares   (271,000)      
Repurchase of common stock, value (3,827) (3) (3,824) 0 0
Cash dividend on common stock (2,748) 0 0 0 (2,748)
Unrealized holding gains on marketable securities, net of tax (61) 0 0 (61) 0
Net income 14,409 0 0 0 14,409
Balance at Sep. 30, 2011 103,488 99 21,690 (126) 81,825
Balance, shares at Sep. 30, 2011   9,934,000      
Balance at Dec. 31, 2011 101,655 99 20,943 (34) 80,647
Balance, shares at Dec. 31, 2011   9,871,000      
Common stock issued on exercise of options, shares (127,797) 128,000      
Common stock issued on exercise of options 1,768 1 1,767 0 0
Stock option compensation expense, net of tax, shares   0      
Stock option compensation expense, net of tax 490 0 490 0 0
Tax benefit of stock option exercises 259 0 259 0 0
Repurchase of common stock, shares   (2,986,000)      
Repurchase of common stock, value (60,232) (30) (22,864) 0 (37,338)
Cash dividend on common stock (2,639) 0 0 0 (2,639)
Unrealized holding gains on marketable securities, net of tax 24 0 0 24 0
Net income 7,342 0 0 0 7,342
Balance at Sep. 30, 2012 $ 48,667 $ 70 $ 595 $ (10) $ 48,012
Balance, shares at Sep. 30, 2012   7,013,000