Acquisitions (Pro Forma Information) (Details) - Dynamic Systems Inc. $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 30, 2019 USD ($) $ / shares
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma net revenues \| $	$ 83,622
Pro forma net earnings attributable to VPG stockholders \| $	$ 11,831
Pro forma basic earnings per share attributable to VPG stockholders (in dollars per share) \| $ / shares	$ 0.88
Pro forma diluted earnings per share attributable to VPG stockholders (in dollars per share) \| $ / shares	$ 0.87

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB
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