Note 11 - Operating Segment and Geographic Information - Net Sales by Country (Details) - USD ($) $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Dec. 25, 2021	Oct. 02, 2021	Mar. 20, 2021	Dec. 26, 2020	Oct. 03, 2020	Mar. 21, 2020	Jul. 10, 2021	Jul. 11, 2020	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Net Sales	$ 73,444	$ 81,298	$ 59,191	$ 74,767	$ 78,069	$ 37,289	$ 99,679	$ 83,524	$ 313,612	$ 273,649	$ 180,541
North America [Member]
Net Sales									309,211	270,173	178,069
Europe [Member]
Net Sales									2,153	1,555	1,001
Other [Member]
Net Sales									$ 2,248	$ 1,921	$ 1,471