Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 28, 2019
Property, plant and equipment	$ 108,272	$ 114,139
Less accumulated depreciation and amortization	(43,584)	(43,227)
Property, plant and equipment, net	64,688	70,912	[1]
Land and Land Improvements [Member]
Property, plant and equipment	8,650	11,659
Building and Building Improvements [Member]
Property, plant and equipment	40,593	41,474
Machinery and Equipment [Member]
Property, plant and equipment	$ 59,029	$ 61,006

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