Note 11 - Leases - Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2021	Mar. 28, 2020
Operating cash flows from operating leases	$ 1,943	$ 2,133
Operating cash flows from finance leases	0	28
Financing cash flows from finance leases	45	9
Leased assets obtained in exchange for new finance lease liabilities	54	373
Leased assets obtained in exchange for new operating lease liabilities	$ 2,350	$ 1,062