Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Property, plant and equipment	$ 113,082	$ 114,139
Less accumulated depreciation and amortization	(48,536)	(43,227)
Property, plant and equipment, net	64,546	70,912	[1]
Land and Land Improvements [Member]
Property, plant and equipment	7,881	11,659
Building and Building Improvements [Member]
Property, plant and equipment	41,624	41,474
Machinery and Equipment [Member]
Property, plant and equipment	$ 63,577	$ 61,006

[1] Derived from December 28, 2019 audited financial statements