Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (loss) [Member]
Balance at Dec. 31, 2018	$ 64,228	$ 270	$ 116,427	$ 82,548	$ (120,406)	$ (14,611)
Balance, shares at Dec. 31, 2018		27,018,000			12,746,000
Employee Stock Purchase Plan share issuance	38		(43)		$ 81
Employee Stock Purchase Plan share issuance, shares					(9,000)
Restricted stock plan share issuance/forfeiture	(94)		475		$ (569)
Restricted stock plan share issuance/forfeiture, shares					219,000
Deferred compensation plan share issuance			(2,034)		$ 2,034
Deferred compensation plan share issuance, shares					(215,000)
Equity-based compensation	249		249
Net Income	632			632
Foreign currency adjustment	(923)					(923)
Pension gain adjustment, net of tax	143					143
Balance at Mar. 29, 2019	64,273	$ 270	115,074	83,180	$ (118,860)	(15,391)
Balance, shares at Mar. 29, 2019		27,018,000			12,741,000
Balance at Dec. 31, 2019	$ 66,236	$ 270	112,096	86,673	$ (114,261)	(18,542)
Balance, shares at Dec. 31, 2019	27,017,824	27,018,000			12,311,000
Employee Stock Purchase Plan share issuance	$ 28		(23)		$ 51
Employee Stock Purchase Plan share issuance, shares					(5,000)
Restricted stock plan share issuance/forfeiture	(81)		(3,473)		$ 3,392
Restricted stock plan share issuance/forfeiture, shares					(356,000)
Equity-based compensation	512		512
Net Income	1,144			1,144
Foreign currency adjustment	(788)					(788)
Pension gain adjustment, net of tax	149					149
Balance at Mar. 27, 2020	$ 67,200	$ 270	$ 109,112	$ 87,817	$ (110,818)	$ (19,181)
Balance, shares at Mar. 27, 2020	27,017,824	27,018,000			11,950,000