Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 25, 2022	Dec. 25, 2021
Property, plant and equipment	$ 136,509	$ 134,956
Less accumulated depreciation and amortization	(74,362)	(70,999)
Property, plant and equipment, net	62,147	63,957	[1]
Land and Land Improvements [Member]
Property, plant and equipment	6,986	7,703
Building and Building Improvements [Member]
Property, plant and equipment	30,578	31,711
Machinery and Equipment [Member]
Property, plant and equipment	$ 98,945	$ 95,542

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