Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (loss) [Member]
Balance at Dec. 31, 2017	$ 78,624	$ 270	$ 120,247	$ 85,029	$ (113,246)	$ (13,676)
Balance, shares at Dec. 31, 2017		27,018,000			11,754,000
Implementation of Accounting Standards	73			73
Employee Stock Purchase Plan share issuance	29		(15)		$ 44
Employee Stock Purchase Plan share issuance, shares					(5,000)
Stock Option Plan share issuance, net	467		(473)		$ 940
Stock Option Plan share issuance, shares					(98,000)
Restricted stock plan share issuance/forfeiture	(615)		(2,436)		$ 1,821
Restricted stock plan share issuance/forfeiture, shares					(168,000)
Deferred compensation plan share issuance	395				$ 395
Deferred compensation plan share issuance, shares					41,000
Purchase of stock	(129)				$ (129)
Purchase of stock, shares					(25,000)
Equity-based compensation	472		472
Net Income	414			414
Foreign currency adjustment	680					680
Pension gain (loss) adjustment, net of tax	(233)					(233)
Balance at Mar. 30, 2018	80,177	$ 270	117,795	85,516	$ (110,175)	(13,229)
Balance, shares at Mar. 30, 2018		27,018,000			11,467,000
Balance at Dec. 31, 2018	$ 64,228	$ 270	116,427	82,548	$ (120,406)	(14,611)
Balance, shares at Dec. 31, 2018	27,017,824	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 (loss) 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	27,017,824	27,018,000			12,741,000