Note 11 - Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands		Mar. 27, 2021	Dec. 26, 2020
2021, operating leases	[1]	$ 5,435
2021, finance leases		138
2021, total		5,573
2022, operating leases	[1]	6,742
2022, finance leases		184
2022, total		6,926
2023, operating leases	[1]	5,771
2023, finance leases		51
2023, total		5,822
2024, operating leases	[1]	5,139
2024, finance leases		11
2024, total		5,150
2025, operating leases	[1]	4,820
2025, finance leases		11
2025, total		4,831
Thereafter, operating leases	[1]	12,181
Thereafter, finance leases		2
Thereafter, total		12,183
Total lease payments, operating leases	[1]	40,088
Total lease payments, finance leases		397
Total lease payments, total		40,485
Less: Interest, operating leases	[1]	(8,557)
Less: Interest, finance leases		(5)
Less: Interest, total		(8,562)
Present value of lease liabilities, finance leases		392
Present value of lease liabilities, total		31,923	$ 31,253
Other Accrued Liabilities and Long-term Lease Liabilities [Member]
Present value of lease liabilities, operating leases	[1]	$ 31,531

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