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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Stock Outstanding [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
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 (in shares) 17        
Exercise of stock options   285     285
Net share settlement of restricted stock units (in shares) (8)        
Net share settlement of restricted stock units   (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
Balance (in shares) at Dec. 31, 2018 7,385     30  
Balance at Dec. 31, 2018 $ 74 29,168 111,802 $ (587) 140,457
Net income         8,332
Balance (in shares) at Jun. 30, 2019 7,428     30  
Balance at Jun. 30, 2019 $ 74 30,033 120,134 $ (587) 149,654
Balance (in shares) at Mar. 31, 2019 7,414     30  
Balance at Mar. 31, 2019 $ 74 29,476 115,536 $ (587) 144,499
Share-based compensation   402     402
Exercise of stock options (in shares) 14        
Exercise of stock options   155     155
Net income     4,598   4,598
Balance (in shares) at Jun. 30, 2019 7,428     30  
Balance at Jun. 30, 2019 $ 74 30,033 120,134 $ (587) 149,654
Balance (in shares) at Dec. 31, 2019 7,446,000     30,000  
Balance at Dec. 31, 2019 $ 74 30,952 131,552 $ (587) 161,991
Share-based compensation (in shares) 28,000        
Share-based compensation   537     537
Exercise of stock options (in shares) 20,000        
Exercise of stock options $ 1 415     416
Net share settlement of restricted stock units (in shares) (11,000)        
Net share settlement of restricted stock units   (560)     (560)
Net income     3,891   3,891
Balance (in shares) at Mar. 31, 2020 7,483,000     30,000  
Balance at Mar. 31, 2020 $ 75 31,344 135,443 $ (587) 166,275
Balance (in shares) at Dec. 31, 2019 7,446,000     30,000  
Balance at Dec. 31, 2019 $ 74 30,952 131,552 $ (587) 161,991
Net income         6,209
Balance (in shares) at Jun. 30, 2020 7,495,000     30,000  
Balance at Jun. 30, 2020 $ 75 31,963 137,761 $ (587) 169,212
Balance (in shares) at Mar. 31, 2020 7,483,000     30,000  
Balance at Mar. 31, 2020 $ 75 31,344 135,443 $ (587) 166,275
Share-based compensation (in shares) 6,000        
Share-based compensation   562     562
Exercise of stock options (in shares) 6,000        
Exercise of stock options   59     59
Net share settlement of restricted stock units   (2)     (2)
Net income     2,318   2,318
Balance (in shares) at Jun. 30, 2020 7,495,000     30,000  
Balance at Jun. 30, 2020 $ 75 $ 31,963 $ 137,761 $ (587) $ 169,212