Note 11 - Leases - Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020
Operating cash flows from operating leases	$ 5,953	$ 6,207
Operating cash flows from finance leases	1	57
Financing cash flows from finance leases	142	104
Leased assets obtained in exchange for new finance lease liabilities	54	468
Leased assets obtained in exchange for new operating lease liabilities	$ 3,669	$ 1,830