Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	AOCI Attributable to Parent
Balance at Dec. 31, 2020	$ 79,508	$ 270	$ 109,407	$ 94,312	$ (109,114)	$ (15,367)
Balance, shares at Dec. 31, 2020		27,018,000			11,842,000
Employee Stock Purchase Plan share issuance	36		(7)		$ 43
Employee Stock Purchase Plan share issuance, shares					5,000
Stock Option Plan share issuance, net	223		(387)		$ 610
Stock Option Plan share issuance, net, shares					82,000
Restricted stock plan share issuance/forfeiture	(96)		(1,218)		$ 1,122
Restricted stock plan share issuance/forfeiture, shares					(119,000)
Equity-based compensation	590		590
Net income	1,508			1,508
Foreign currency adjustment	(2,245)					(2,245)
Pension loss adjustment, net of tax	550					550
Balance at Apr. 02, 2021	80,074	$ 270	108,385	95,820	$ (107,339)	(17,062)
Balance, shares at Apr. 02, 2021		27,018,000			11,636,000
Balance at Dec. 31, 2021	$ 94,437	$ 270	110,330	108,042	$ (107,265)	(16,940)
Balance, shares at Dec. 31, 2021	27,017,824	27,018,000			11,668,000
Employee Stock Purchase Plan share issuance	$ 37		(2)		$ 39
Employee Stock Purchase Plan share issuance, shares					4,000
Stock Option Plan share issuance, net	90		(94)		$ 184
Stock Option Plan share issuance, net, shares					20,000
Restricted stock plan share issuance/forfeiture	(971)		(1,385)		$ 414
Restricted stock plan share issuance/forfeiture, shares					(45,000)
Equity-based compensation	573		573
Net income	2,240			2,240
Foreign currency adjustment	(1,329)					(1,329)
Pension loss adjustment, net of tax	331					331
Balance at Apr. 01, 2022	$ 95,408	$ 270	$ 109,422	$ 110,282	$ (106,628)	$ (17,938)
Balance, shares at Apr. 01, 2022	27,017,824	27,018,000			11,599,000