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Consolidated Statements Of Shareholders' Equity - USD ($)
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, 2014 $ 292,000 $ 135,227,000 $ 22,768,000 $ (121,000) $ (9,481,000) $ 148,685,000
Balance, shares at Dec. 31, 2014 29,229,000       (1,101,000)  
Net income 4,005,000 4,005,000
Foreign currency translation gain (loss) 45,000 45,000
Comprehensive income 4,050,000
Cash dividends paid (3,408,000) (3,408,000)
Equity compensation $ 3,000 5,323,000 5,326,000
Equity compensation, shares 271,000        
Exercise of options $ 2,000 1,837,000 $ (1,002,000) 837,000
Exercise of options, shares 248,000       (93,000)  
Employee stock purchase plan $ 1,000 688,000 $ 689,000
Employee stock purchase plan, shares 78,000         78,000
Excess tax benefit/shortfall 458,000 $ 458,000
Redemption and repurchase of stock to cover tax withholdings (645,000) $ (741,000) (1,386,000)
Redemption and repurchase of stock to cover tax withholdings, shares (60,000)       (71,000)  
Balance at Dec. 31, 2015 $ 298,000 142,888,000 23,365,000 (76,000) $ (11,224,000) 155,251,000
Balance, shares at Dec. 31, 2015 29,766,000       (1,265,000)  
Net income 10,778,000 10,778,000
Foreign currency translation gain (loss) (353,000) (353,000)
Comprehensive income 10,425,000
Equity compensation $ 3,000 6,599,000 6,602,000
Equity compensation, shares 342,000        
Exercise of options $ 3,000 2,083,000 $ (712,000) 1,374,000
Exercise of options, shares 372,000       (69,000)  
Employee stock purchase plan $ 1,000 828,000 $ 829,000
Employee stock purchase plan, shares 90,000         90,000
Excess tax benefit/shortfall 606,000 $ 606,000
Redemption and repurchase of stock to cover tax withholdings (499,000) $ (198,000) (697,000)
Redemption and repurchase of stock to cover tax withholdings, shares (44,000)       (22,000)  
Stock issued during period, Acquisition $ 37,000 34,556,000 34,593,000
Stock issued during period, Shares, Acquisition 3,704,000          
Balance at Dec. 31, 2016 $ 342,000 187,061,000 34,143,000 (429,000) $ (12,134,000) 208,983,000
Balance, shares at Dec. 31, 2016 34,230,000       (1,356,000)  
Net income 3,704,000 3,704,000
Foreign currency translation gain (loss) 2,286,000 2,286,000
Comprehensive income 5,990,000
Equity compensation $ 3,000 7,310,000 7,313,000
Equity compensation, shares 311,000          
Exercise of options $ 4,000 2,476,000 $ (585,000) 1,895,000
Exercise of options, shares 393,000       (30,000)  
Employee stock purchase plan $ 1,000 1,230,000 $ 1,231,000
Employee stock purchase plan, shares 93,000         93,000
Redemption and repurchase of stock to cover tax withholdings $ (1,000) (1,613,000) $ (1,614,000)
Redemption and repurchase of stock to cover tax withholdings, shares (92,000)        
Stock issued during period, Acquisition $ 27,000 53,092,000 53,119,000
Stock issued during period, Shares, Acquisition 2,683,000        
Balance at Dec. 31, 2017 $ 376,000 249,935,000 37,609,000 1,857,000 $ (12,719,000) 277,058,000
Balance, shares at Dec. 31, 2017 37,618,000       (1,386,000)  
Cumulative effect of ASU 2016-09 Adjustment | ASU 2016-09 [Member] $ 379,000 $ (238,000) $ 141,000