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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Balance (in shares) at Dec. 31, 2014 7,069        
Balance at Dec. 31, 2014 $ 71,000 $ 22,132,000 $ 72,789,000   $ 94,992,000
Share-based compensation (in shares) 24        
Share-based compensation 1,069,000     1,069,000
Exercise of stock options net of shares presented for exercise (in shares) 77        
Exercise of stock options net of shares presented for exercise $ 1,000 357,000     358,000
Net share settlement of restricted stock units and stock option tax withholding (209,000) (209,000)
Excess tax benefits on share-based compensation   356,000     356,000
Repurchase of common stock (in shares) (30)     30  
Repurchase of common stock       $ (587,000) (587,000)
Net income     7,593,000   7,593,000
Balance (in shares) at Dec. 31, 2015 7,140     30  
Balance at Dec. 31, 2015 $ 72,000 23,705,000 80,382,000 $ (587,000) 103,572,000
Share-based compensation (in shares) 33        
Share-based compensation 1,056,000     1,056,000
Exercise of stock options net of shares presented for exercise (in shares) 48        
Exercise of stock options net of shares presented for exercise 529,000     529,000
Net share settlement of restricted stock units and stock option tax withholding (219,000) (219,000)
Excess tax benefits on share-based compensation   145,000     145,000
Net income     7,970,000   7,970,000
Net share settlement of restricted stock units and stock option tax withholding (in shares) (9)        
Balance (in shares) at Dec. 31, 2016 7,212     30  
Balance at Dec. 31, 2016 $ 72,000 25,216,000 88,352,000 $ (587,000) 113,053,000
Share-based compensation (in shares) 32        
Share-based compensation $ 1,000 1,067,000     1,068,000
Exercise of stock options net of shares presented for exercise (in shares) 47        
Exercise of stock options net of shares presented for exercise $ 1,000 676,000     677,000
Net share settlement of restricted stock units and stock option tax withholding $ (1,000) (295,000) (296,000)
Excess tax benefits on share-based compensation         0
Net income     9,210,000   9,210,000
Net share settlement of restricted stock units and stock option tax withholding (in shares) (11)        
Balance (in shares) at Dec. 31, 2017 7,280     30  
Balance at Dec. 31, 2017 $ 73,000 $ 26,664,000 $ 97,562,000 $ (587,000) $ 123,712,000