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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 11,008     10,858     150
Dividend declared – Common Stock, $0.22/share in 2018 and $0.23/share in 2019 (2,440)     (2,440)      
Activity under stock plans (1,435)   (3,393)   $ 1,958    
Activity under stock plans (in shares)         (79,888)    
Other comprehensive items 5,546         5,503 43
Ending balance (in shares) at Mar. 31, 2018   14,624,159     3,533,950    
Ending balance at Mar. 31, 2018 345,227 $ 146 99,828 351,355 $ (86,596) (21,212) 1,706
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 11,065     10,900     165
Dividend declared – Common Stock, $0.22/share in 2018 and $0.23/share in 2019 (2,570)     (2,570)      
Activity under stock plans (372)   (1,951)   $ 1,579    
Activity under stock plans (in shares)         (64,435)    
Other comprehensive items (681)         (648) (33)
Ending balance (in shares) at Mar. 30, 2019   14,624,159     3,449,728    
Ending balance at Mar. 30, 2019 $ 381,996 $ 146 $ 102,780 $ 401,891 $ (84,532) $ (40,024) $ 1,735