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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Capital in Excess of Par Value
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Items
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adoption of ASU | ASU No. 2014-09 $ 119     $ 119      
Adoption of ASU | ASU No. 2016-16 (75)     (75)      
Beginning balance (in shares) at Dec. 30, 2017   14,624,159     3,613,838    
Beginning balance at Dec. 30, 2017 332,504 $ 146 $ 103,221 342,893 $ (88,554) $ (26,715) $ 1,513
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 42,478     41,991     487
Dividend declared – Common Stock (7,326)     (7,326)      
Dividend paid to minority shareholder (465)           (465)
Activity under stock plans 2,273   (104)   $ 2,377    
Activity under stock plans (in shares)         (96,975)    
Other comprehensive items (11,069)         (11,012) (57)
Ending balance (in shares) at Sep. 29, 2018   14,624,159     3,516,863    
Ending balance at Sep. 29, 2018 358,439 $ 146 103,117 377,602 $ (86,177) (37,727) 1,478
Beginning balance (in shares) at Jun. 30, 2018   14,624,159     3,528,550    
Beginning balance at Jun. 30, 2018 341,685 $ 146 101,842 361,262 $ (86,464) (36,853) 1,752
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 18,979     18,784     195
Dividend declared – Common Stock (2,444)     (2,444)      
Dividend paid to minority shareholder (465)           (465)
Activity under stock plans 1,562   1,275   $ 287    
Activity under stock plans (in shares)         (11,687)    
Other comprehensive items (878)         (874) (4)
Ending balance (in shares) at Sep. 29, 2018   14,624,159     3,516,863    
Ending balance at Sep. 29, 2018 358,439 $ 146 103,117 377,602 $ (86,177) (37,727) 1,478
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adoption of ASU | ASU No. 2016-02 (17)     (17)      
Beginning balance (in shares) at Dec. 29, 2018   14,624,159     3,514,163    
Beginning balance at Dec. 29, 2018 374,571 $ 146 104,731 393,578 $ (86,111) (39,376) 1,603
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 43,679     43,319     360
Dividend declared – Common Stock (7,753)     (7,753)      
Activity under stock plans 4,461   488   $ 3,973    
Activity under stock plans (in shares)         (162,129)    
Other comprehensive items (8,068)         (7,984) (84)
Ending balance (in shares) at Sep. 28, 2019   14,624,159     3,352,034    
Ending balance at Sep. 28, 2019 406,873 $ 146 105,219 429,127 $ (82,138) (47,360) 1,879
Beginning balance (in shares) at Jun. 29, 2019   14,624,159     3,369,304    
Beginning balance at Jun. 29, 2019 400,560 $ 146 103,767 415,605 $ (82,562) (38,251) 1,855
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 16,213     16,115     98
Dividend declared – Common Stock (2,593)     (2,593)      
Activity under stock plans 1,876   1,452   $ 424    
Activity under stock plans (in shares)         (17,270)    
Other comprehensive items (9,183)         (9,109) (74)
Ending balance (in shares) at Sep. 28, 2019   14,624,159     3,352,034    
Ending balance at Sep. 28, 2019 $ 406,873 $ 146 $ 105,219 $ 429,127 $ (82,138) $ (47,360) $ 1,879