Note 14 - Segment Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Revenue	$ 44,549	$ 45,033
UNITED STATES
Revenue	39,007	39,176
CANADA
Revenue	3,385	4,002
PUERTO RICO
Revenue	1,515	1,202
SERBIA
Revenue	$ 642	$ 653