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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Balance (in shares) at Dec. 31, 2017 7,280     30  
Balance at Dec. 31, 2017 $ 73 $ 26,664 $ 97,562 $ (587) $ 123,712
Share-based compensation (in shares) 16      
Share-based compensation 237 237
Exercise of stock options net of shares presented for exercise (in shares) 30      
Exercise of stock options net of shares presented for exercise 367 367
Net share settlement of restricted stock units and stock option tax withholding (in shares) (5)      
Net share settlement of restricted stock units and stock option tax withholding (144) (144)
Net income 1,777 1,777
Excess tax benefits on share-based compensation - adjustment 167 167
Adoption of ASC 606 (95) (95)
Balance (in shares) at Mar. 31, 2018 7,321     30  
Balance at Mar. 31, 2018 $ 73 27,291 99,244 $ (587) 126,021
Balance (in shares) at Dec. 31, 2018 7,385     30  
Balance at Dec. 31, 2018 $ 74 29,168 111,802 $ (587) 140,457
Share-based compensation (in shares) 20        
Share-based compensation 294     294
Exercise of stock options net of shares presented for exercise (in shares) 17        
Exercise of stock options net of shares presented for exercise 285     285
Net share settlement of restricted stock units and stock option tax withholding (in shares) (8)      
Net share settlement of restricted stock units and stock option tax withholding (271) (271)
Net income     3,734   3,734
Balance (in shares) at Mar. 31, 2019 7,414     30  
Balance at Mar. 31, 2019 $ 74 $ 29,476 $ 115,536 $ (587) $ 144,499