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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Common Stock
Common Stock
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Additional Paid-in Capital
Additional Paid-in Capital
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Accumulated Other Comprehensive loss
Accumulated Other Comprehensive loss
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Retained Earnings
Retained Earnings
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Treasury Stock
Treasury Stock
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
AVD Total
AVD Total
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Non- Controlling Interest
Non- Controlling Interest
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Balance at Dec. 31, 2017 $ 305,314 $ 2,214 $ 3,225 $ 75,658 $ (4,507) $ 238,953 $ 2,214 $ (8,269) $ 305,060 $ 2,214 $ 254
Balance (in shares) at Dec. 31, 2017     32,241,866               2,450,634          
Adjustment to recognize new standard on taxes on foreign asset transfers (180)         (180)     (180)    
Stocks issued under ESPP $ 670   $ 2   668         670    
Stocks issued under ESPP, Shares 35,950   35,950                          
Cash dividends on common stock ($0.08 per share 2018, $0.08 per share 2019, $0.04 per share 2020) $ (2,342)         (2,342)     (2,342)    
Stock based compensation 5,805     5,805         5,805    
Stock options exercised; grants, termination, and vesting of restricted stock units (net of shares in lieu of taxes) 1,047   $ 49   998         1,047    
Stock options exercised; grants, termination, and vesting of restricted stock units (net of shares in lieu of taxes), Shares     475,011                          
Non-controlling interest (73)     48         48   (121)  
Shares repurchased (7,287)           $ (7,287)   (7,287)    
Shares repurchased (In Shares)                     (452,358)          
Net income 24,062         24,195     24,195   (133)  
Balance at Dec. 31, 2018 329,230   $ 3,276   83,177   (4,507)   262,840   $ (15,556)   329,230    
Balance (in shares) at Dec. 31, 2018     32,752,827               2,902,992          
Stocks issued under ESPP $ 716   $ 5   711         716    
Stocks issued under ESPP, Shares 47,229   47,229                          
Cash dividends on common stock ($0.08 per share 2018, $0.08 per share 2019, $0.04 per share 2020) $ (2,323)         (2,323)     (2,323)    
Foreign currency translation adjustment, net (1,191)       (1,191)       (1,191)    
Stock based compensation 7,160     7,160         7,160    
Stock options exercised; grants, termination, and vesting of restricted stock units (net of shares in lieu of taxes) (433)   $ 43   (476)         (433)    
Stock options exercised; grants, termination, and vesting of restricted stock units (net of shares in lieu of taxes), Shares     433,558                          
Shares repurchased (2,604)           $ (2,604)   (2,604)    
Shares repurchased (In Shares)                     (158,048)          
Net income 13,601         13,601     13,601    
Balance at Dec. 31, 2019 $ 344,156   $ 3,324   90,572   (5,698)   274,118   $ (18,160)   344,156    
Balance (in shares) at Dec. 31, 2019 33,233,614   33,233,614               3,061,040          
Stocks issued under ESPP $ 721   $ 5   716         721    
Stocks issued under ESPP, Shares 49,668   49,668                          
Cash dividends on common stock ($0.08 per share 2018, $0.08 per share 2019, $0.04 per share 2020) $ (1,178)         (1,178)     (1,178)    
Foreign currency translation adjustment, net (3,624)       (3,624)       (3,624)    
Stock based compensation 6,561     6,561         6,561    
Stock options exercised; grants, termination, and vesting of restricted stock units (net of shares in lieu of taxes) (1,142)   $ 65   (1,207)         (1,142)    
Stock options exercised; grants, termination, and vesting of restricted stock units (net of shares in lieu of taxes), Shares     639,151                          
Net income 15,242         15,242     15,242    
Balance at Dec. 31, 2020 $ 360,736   $ 3,394   $ 96,642   $ (9,322)   $ 288,182   $ (18,160)   $ 360,736    
Balance (in shares) at Dec. 31, 2020 33,922,433   33,922,433               3,061,040