Note 9 - Leases - Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Operating cash flows from operating leases	$ 2,133	$ 1,881
Operating cash flows from finance leases	28	37
Financing cash flows from finance leases	9	9
Leased assets obtained in exchange for new finance lease liabilities	373
Leased assets obtained in exchange for new operating lease liabilities	$ 1,062	$ 31,508