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Acquisition Activity (Pro Forma Information) (Details) - Dynamic Systems Inc. - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Pro forma net revenues $ 298,085 $ 314,437
Pro forma net earnings attributable to VPG stockholders $ 22,775 $ 23,821
Pro forma basic earnings per share attributable to VPG stockholders (in dollars per share) $ 1.69 $ 1.77
Pro forma diluted earnings per share attributable to VPG stockholders (in dollars per share) $ 1.68 $ 1.76