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Consolidated Statements Of Shareholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2013 $ 282 $ 128,585 $ 18,741 $ 7 $ (2,868) $ 144,747
Balance, shares at Dec. 31, 2013 28,244,000       (413,000)  
Net income 7,322 7,322
Other comprehensive income (loss) (128) (128)
Comprehensive income 7,194
Cash dividends paid (3,295) (3,295)
Equity compensation $ 6 3,691 3,697
Equity compensation, shares 642,000        
Exercise of options $ 3 2,150 $ (191) 1,962
Exercise of options, shares 297,000       (18,000)  
Employee stock purchase plan $ 1 712 $ 713
Employee stock purchase plan, shares 111,000         111,000
Excess tax benefit/shortfall 738 $ 738
Repurchase of common stock $ (5,588) (5,588)
Repurchase of common stock, shares         (585,000)  
Redemption and repurchase of stock to cover tax withholdings (649) $ (834) (1,483)
Redemption and repurchase of stock to cover tax withholdings, shares (65,000)       (85,000)  
Balance at Dec. 31, 2014 $ 292 135,227 22,768 (121) $ (9,481) 148,685
Balance, shares at Dec. 31, 2014 29,229,000       (1,101,000)  
Net income 4,005 4,005
Other comprehensive income (loss) 45 45
Comprehensive income 4,050
Cash dividends paid (3,408) (3,408)
Equity compensation $ 3 5,323 5,326
Equity compensation, shares 271,000        
Exercise of options $ 2 1,837 $ (1,002) 837
Exercise of options, shares 248,000       (93,000)  
Employee stock purchase plan $ 1 688 $ 689
Employee stock purchase plan, shares 78,000         78,000
Excess tax benefit/shortfall 458 $ 458
Redemption and repurchase of stock to cover tax withholdings (645) $ (741) (1,386)
Redemption and repurchase of stock to cover tax withholdings, shares (60,000)       (71,000)  
Balance at Dec. 31, 2015 $ 298 142,888 23,365 (76) $ (11,224) 155,251
Balance, shares at Dec. 31, 2015 29,766,000       (1,265,000)  
Net income 10,778 10,778
Other comprehensive income (loss) (353) (353)
Comprehensive income 10,425
Equity compensation $ 3 6,599 6,602
Equity compensation, shares 342,000          
Exercise of options $ 3 2,083 $ (712) 1,374
Exercise of options, shares 372,000       (69,000)  
Employee stock purchase plan $ 1 828 $ 829
Employee stock purchase plan, shares 90,000         90,000
Excess tax benefit/shortfall 606 $ 606
Redemption and repurchase of stock to cover tax withholdings (499) $ (198) (697)
Redemption and repurchase of stock to cover tax withholdings, shares (44,000)       (22,000)  
Stock issued for On-X Transaction $ 37 34,556 34,593
Stock issued for On-X Transaction, shares 3,704,000        
Balance at Dec. 31, 2016 $ 342 $ 187,061 $ 34,143 $ (429) $ (12,134) $ 208,983
Balance, shares at Dec. 31, 2016 34,230,000       (1,356,000)