Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 632	$ 414
Foreign currency translation adjustment, net of taxes	(923)	680
Change in pension gain (loss), net of taxes of $0 and $9 in the 2019 and 2018 first quarters, respectively	143	(233)
Other comprehensive income (loss)	(780)	447
Comprehensive income (loss)	$ (148)	$ 861