Note 14 - Segment Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Revenue	$ 48,933	$ 32,652	$ 93,482	$ 77,685
UNITED STATES
Revenue	43,746	26,989	82,753	66,165
CANADA
Revenue	3,074	3,641	6,459	7,643
PUERTO RICO
Revenue	1,368	1,383	2,883	2,585
SERBIA
Revenue	$ 745	$ 639	$ 1,387	$ 1,292