Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 1,759	$ 943	$ 2,903	$ 1,575
Foreign currency translation adjustment, net of taxes	732	445	(56)	(478)
Change in pension, net of taxes of $1 and $0 in the 2020 and 2019 second quarters, respectively, and $1 and $0 in the first two quarters of 2020 and 2019, respectively	(88)	(46)	61	97
Other comprehensive income (loss)	644	399	5	(381)
Comprehensive income	$ 2,403	$ 1,342	$ 2,908	$ 1,194