Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 943	$ 940	$ 1,575	$ 1,354
Foreign currency translation adjustment, net of taxes	445	(1,829)	(478)	(1,149)
Change in pension (loss) gain, net of taxes of $0 and $9 in the 2019 and 2018 second quarters, respectively, and $0 and $18 in the first two quarters of 2019 and 2018, respectively	(46)	503	97	270
Other comprehensive income (loss)	399	(1,326)	(381)	(879)
Comprehensive income (loss)	$ 1,342	$ (386)	$ 1,194	$ 475