Note 11 - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands		Mar. 27, 2021	Dec. 26, 2020
Operating lease assets		$ 29,917	$ 29,203	[1]
Finance lease assets	[2]	502	486
Total lease assets		30,419	29,689
Total lease liabilities		$ 31,923	$ 31,253
Operating leases (Year)		7 years 1 month 6 days	7 years 3 months 18 days
Finance leases (Year)		2 years 4 months 24 days	2 years 3 months 18 days
Operating leases		6.20%	6.30%
Finance leases		0.60%	0.00%
Other Accrued Liabilities [Member]
Operating, current		$ 5,490	$ 5,287
Finance, current		182	179
Long-term Lease Liabilities [Member]
Operating, noncurrent		26,041	25,565
Finance, noncurrent		$ 210	$ 222

[1] Derived from December 26, 2020 audited financial statements

[2] Finance lease assets are recorded net of accumulated amortization of $0.1 million as of March 27, 2021 and December 26, 2020.