Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (loss)
Balance at Dec. 31, 2021	$ 94,437	$ 270	$ 110,330	$ 108,042	$ (107,265)	$ (16,940)
Balance, shares at Dec. 31, 2021		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		27,018,000			11,599,000
Balance at Dec. 31, 2022	$ 105,979	$ 270	109,868	114,651	$ (103,504)	(15,306)
Balance, shares at Dec. 31, 2022	27,017,824	27,018,000			11,274,000
Employee Stock Purchase Plan share issuance	$ 56		(13)		$ 69
Employee Stock Purchase Plan share issuance, shares					(7,000)
Stock Option Plan share issuance, net	68		(117)		$ 185
Stock Option Plan share issuance, net, shares					(18,000)
Restricted Stock Plan share issuance/forfeiture	(447)		(1,843)		$ 1,396
Restricted Stock Plan share issuance/forfeiture, shares					(137,000)
Equity-based compensation	345		345
Net income	315			315
Foreign currency adjustment	944					944
Pension loss adjustment, net of tax	44					44
Balance at Mar. 31, 2023	$ 107,304	$ 270	$ 108,240	$ 114,966	$ (101,854)	$ (14,318)
Balance, shares at Mar. 31, 2023	27,017,824	27,018,000			11,112,000