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	84		(2)		$ 86
Employee Stock Purchase Plan share issuance, shares					9,000
Stock Option Plan share issuance, net	366		(427)		$ 793
Stock Option Plan share issuance, net, shares					82,000
Restricted Stock Plan share issuance/forfeiture	(389)		(1,117)		$ 728
Restricted Stock Plan share issuance/forfeiture, shares					(61,000)
Equity-based compensation	1,272		1,272
Net income	3,341			3,341
Foreign currency adjustment	(1,991)					(1,991)
Pension loss adjustment, net of tax	606					606
Balance at Jul. 02, 2021	82,797	$ 270	109,133	97,653	$ (107,507)	(16,752)
Balance, shares at Jul. 02, 2021		27,018,000			11,690,000
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
Employee Stock Purchase Plan share issuance	48		5		$ 43
Employee Stock Purchase Plan share issuance, shares					(5,000)
Stock Option Plan share issuance, net	143		(40)		$ 183
Restricted Stock Plan share issuance/forfeiture	(293)		101		$ (394)
Restricted Stock Plan share issuance/forfeiture, shares					59,000
Equity-based compensation	682		682
Net income	1,833			1,833
Foreign currency adjustment	254					254
Pension loss adjustment, net of tax	56					56
Balance at Jul. 02, 2021	82,797	$ 270	109,133	97,653	$ (107,507)	(16,752)
Balance, shares at Jul. 02, 2021		27,018,000			11,690,000
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	$ 84		(3)		$ 87
Employee Stock Purchase Plan share issuance, shares					(9,000)
Stock Option Plan share issuance, net	215		(233)		$ 448
Stock Option Plan share issuance, net, shares					(49,000)
Restricted Stock Plan share issuance/forfeiture	(1,229)		(2,380)		$ 1,151
Restricted Stock Plan share issuance/forfeiture, shares					(111,000)
Equity-based compensation	1,176		1,176
Net income	4,280			4,280
Foreign currency adjustment	(4,567)					(4,567)
Pension loss adjustment, net of tax	911					911
Balance at Jul. 01, 2022	$ 95,307	$ 270	108,890	112,322	$ (105,579)	(20,596)
Balance, shares at Jul. 01, 2022	27,017,824	27,018,000			11,499,000
Balance at Apr. 01, 2022	$ 95,408	$ 270	109,422	110,282	$ (106,628)	(17,938)
Balance, shares at Apr. 01, 2022		27,018,000			11,599,000
Employee Stock Purchase Plan share issuance	47		(1)		$ 48
Employee Stock Purchase Plan share issuance, shares					(5,000)
Stock Option Plan share issuance, net	125		(139)		$ 264
Stock Option Plan share issuance, net, shares					(29,000)
Restricted Stock Plan share issuance/forfeiture	(258)		(995)		$ 737
Restricted Stock Plan share issuance/forfeiture, shares					(66,000)
Equity-based compensation	603		603
Net income	2,040			2,040
Foreign currency adjustment	(3,238)					(3,238)
Pension loss adjustment, net of tax	580					580
Balance at Jul. 01, 2022	$ 95,307	$ 270	$ 108,890	$ 112,322	$ (105,579)	$ (20,596)
Balance, shares at Jul. 01, 2022	27,017,824	27,018,000			11,499,000