Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Property, plant and equipment	$ 110,789	$ 114,139
Less accumulated depreciation and amortization	(44,984)	(43,227)
Property, plant and equipment, net	65,805	70,912	[1]
Land and Land Improvements [Member]
Property, plant and equipment	8,724	11,659
Building and Building Improvements [Member]
Property, plant and equipment	42,467	41,474
Machinery and Equipment [Member]
Property, plant and equipment	$ 59,598	$ 61,006

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