Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jun. 26, 2020	Jul. 02, 2021	Jun. 26, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 1,833	$ 1,759	$ 3,341	$ 2,903
Foreign currency translation adjustment, net of taxes	254	732	(1,991)	(56)
Change in pension, net of taxes of $(10) and $1 in the 2021 and 2020 second quarters, respectively, and $(20) and $1 in the first two quarters of 2021 and 2020, respectively	56	(88)	606	61
Other comprehensive income (loss)	310	644	(1,385)	5
Comprehensive income	$ 2,143	$ 2,403	$ 1,956	$ 2,908