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Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Numerator:    
Net earnings attributable to VPG stockholders $ 3,312 $ 8,243
Denominator:    
Weighted average shares (in shares) 13,541 13,495
Effect of dilutive securities:    
Restricted stock units (in shares) 45 68
Dilutive potential common shares 45 68
Denominator for diluted earnings per share:    
Adjusted weighted average shares (in shares) 13,586 13,563
Basic earnings per share attributable to VPG stockholders (dollars per share) $ 0.24 $ 0.61
Diluted earnings per share attributable to VPG stockholders (dollars per share) $ 0.24 $ 0.61