Note 14 - Segment Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Revenues	$ 150,409	$ 191,100
UNITED STATES
Revenues	126,238	166,750
CANADA
Revenues	15,310	16,822
PUERTO RICO
Revenues	5,702	4,942
SERBIA
Revenues	$ 3,159	$ 2,586