Note 10 - Financial Information about Geographic Areas (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 30, 2022	Mar. 31, 2021	Mar. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 17,661,000	$ 17,661,000	$ 23,161,000	$ 23,161,000
CANADA
Revenue from Contract with Customer, Including Assessed Tax	$ 474,000		$ 2,115,000