Segment Information (Schedule of Segment Reporting) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 28, 2020	Mar. 30, 2019
Segment Reporting Information [Line Items]
Net revenues	$ 67,696	$ 76,525
Gross profit	25,065	33,051
Segment operating income	4,644	12,603
Restructuring costs	(130)	0
Foil Technology Products
Segment Reporting Information [Line Items]
Net revenues	30,477	37,049
Restructuring costs	(130)	0
Force Sensors
Segment Reporting Information [Line Items]
Net revenues	14,695	16,732
Weighing and Control Systems
Segment Reporting Information [Line Items]
Net revenues	22,524	22,744
Operating Segments
Segment Reporting Information [Line Items]
Net revenues	67,696	76,525
Gross profit	25,065	33,051
Operating Segments \| Foil Technology Products
Segment Reporting Information [Line Items]
Net revenues	30,477	37,049
Gross profit	11,201	16,579
Segment operating income	5,384	10,306
Operating Segments \| Force Sensors
Segment Reporting Information [Line Items]
Net revenues	14,695	16,732
Gross profit	3,572	5,061
Segment operating income	1,204	2,535
Operating Segments \| Weighing and Control Systems
Segment Reporting Information [Line Items]
Net revenues	22,524	22,744
Gross profit	10,292	11,411
Segment operating income	4,668	6,575
Segment Reconciling Items
Segment Reporting Information [Line Items]
Unallocated G&A expenses	(6,482)	(6,813)
Restructuring costs	$ (130)	$ 0

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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