Note 9 - Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands		Sep. 26, 2020	Dec. 28, 2019
2020, operating leases	[1]	$ 1,709
2020, finance leases		41
2020, total		1,750
2021, operating leases	[1]	6,733
2021, finance leases		164
2021, total		6,897
2022, operating leases	[1]	5,932
2022, finance leases		164
2022, total		6,096
2023, operating leases	[1]	5,158
2023, finance leases		34
2023, total		5,192
2024, operating leases	[1]	4,750
2024, finance leases		0
2024, total		4,750
Thereafter, operating leases	[1]	16,295
Thereafter, finance leases		0
Thereafter, total		16,295
Total lease payments, operating leases	[1]	40,577
Total lease payments, finance leases		403
Total lease payments, total		40,980
Less: Interest, operating leases	[1]	(9,185)
Less: Interest, finance leases		0
Less: Interest, total		(9,185)
Present value of lease liabilities, operating leases	[1]	31,392
Present value of lease liabilities, finance leases		403
Present value of lease liabilities, total		$ 31,795	$ 36,909

[1] Excludes sublease income of $0.1 million in 2021.