Note 11 - Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands		Sep. 25, 2021	Dec. 26, 2020
2021, operating leases	[1]	$ 1,671
2021, finance leases		46
2021, total		1,717
2022, operating leases	[1]	6,322
2022, finance leases		184
2022, total		6,506
2023, operating leases	[1]	5,371
2023, finance leases		40
2023, total		5,411
2024, operating leases	[1]	5,043
2024, finance leases		11
2024, total		5,054
2025, operating leases	[1]	4,914
2025, finance leases		11
2025, total		4,925
Thereafter, operating leases	[1]	12,232
Thereafter, finance leases		3
Thereafter, total		12,235
Total lease payments, operating leases	[1]	35,553
Total lease payments, finance leases		295
Total lease payments, total		35,848
Less: Interest, operating leases	[1]	(7,573)
Less: Interest, finance leases		(4)
Less: Interest, total		(7,577)
Present value of lease liabilities, finance leases		291
Present value of lease liabilities, total		28,271	$ 31,253
Other Accrued Liabilities and Long-term Lease Liabilities [Member]
Present value of lease liabilities, operating leases	[1]	$ 27,980

[1] Excludes sublease income of $0.1 million in 2022 and 2023.