Note 16 - Revenue from Contracts with Customers - Contract Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Increase due to cash received, excluding amounts recognized as revenue during the period	$ 0	$ 0	$ 0
Revenue recognized that was included in the contract liability balance at the beginning of the period	0	0	(413)
Increase in contract liability during the period	$ 0	$ 0	$ 0