Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 26, 2022	Dec. 25, 2021
Property, plant and equipment	$ 136,868	$ 134,956
Less accumulated depreciation and amortization	(72,956)	(70,999)
Property, plant and equipment, net	63,912	63,957	[1]
Land and Land Improvements [Member]
Property, plant and equipment	7,998	7,703
Building and Building Improvements [Member]
Property, plant and equipment	30,987	31,711
Machinery and Equipment [Member]
Property, plant and equipment	$ 97,883	$ 95,542

[1] Derived from December 25, 2021 audited financial statements