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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Beginning balance at Dec. 31, 2011 $ 101,655 $ 99 $ 20,943 $ (34) $ 80,647
Beginning balance, shares at Dec. 31, 2011   9,871,000      
Common stock issued on exercise of options, shares   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 (60,232) (30) (22,864) 0 (37,338)
Cash dividends on common stock (2,639) 0 0 0 (2,639)
Unrealized holding gains (losses) on marketable securities, net of tax 24 0 0 24 0
Net Income 7,342 0 0 0 7,342
Ending Balance at Sep. 30, 2012 48,667 70 595 (10) 48,012
Ending balance, shares at Sep. 30, 2012   7,013,000      
Beginning balance at Dec. 31, 2012 53,896 70 913 23 52,890
Beginning balance, shares at Dec. 31, 2012   7,017,000      
Common stock issued on exercise of options, shares   148,000      
Common stock issued on exercise of options 1,860 2 1,858 0 0
Stock option compensation expense, net of tax, shares   0      
Stock option compensation expense, net of tax 602 0 602 0 0
Excess tax benefits from share-based compensation 2,083 0 2,083 0 0
Cash dividends on common stock (2,765) 0 0 0 (2,765)
Unrealized holding gains (losses) on marketable securities, net of tax (39) 0 0 (39) 0
Net Income 12,331 0 0 0 12,331
Ending Balance at Sep. 30, 2013 $ 67,968 $ 72 $ 5,456 $ (16) $ 62,456
Ending balance, shares at Sep. 30, 2013   7,165,000