Note 11 - Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands		Jun. 26, 2021	Dec. 26, 2020
2021, operating leases	[1]	$ 3,200
2021, finance leases		93
2021, total		3,293
2022, operating leases	[1]	6,120
2022, finance leases		186
2022, total		6,306
2023, operating leases	[1]	5,177
2023, finance leases		52
2023, total		5,229
2024, operating leases	[1]	4,898
2024, finance leases		11
2024, total		4,909
2025, operating leases	[1]	4,823
2025, finance leases		11
2025, total		4,834
Thereafter, operating leases	[1]	12,181
Thereafter, finance leases		4
Thereafter, total		12,185
Total lease payments, operating leases	[1]	36,399
Total lease payments, finance leases		357
Total lease payments, total		36,756
Less: Interest, operating leases	[1]	(7,957)
Less: Interest, finance leases		(5)
Less: Interest, total		(7,962)
Present value of lease liabilities, finance leases		352
Present value of lease liabilities, total		28,794	$ 31,253
Other Accrued Liabilities and Long-term Lease Liabilities [Member]
Present value of lease liabilities, operating leases	[1]	$ 28,442

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