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Segment Information (Intersegment Sales) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 67,696	$ 76,525
Foil Technology Products
Segment Reporting Information [Line Items]
Total revenue	30,477	37,049
Foil Technology Products | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenue	724	933
Force Sensors
Segment Reporting Information [Line Items]
Total revenue	14,695	16,732
Force Sensors | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenue	0	427
Weighing and Control Systems
Segment Reporting Information [Line Items]
Total revenue	22,524	22,744
Weighing and Control Systems | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenue	$ 87	$ 153

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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+ References

No definition available.

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