Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Property, plant and equipment	$ 113,093	$ 113,961
Less accumulated depreciation and amortization	(41,301)	(39,629)
Property, plant and equipment, net	71,792	74,332	[1]
Land and Land Improvements [Member]
Property, plant and equipment	12,260	11,905
Building and Building Improvements [Member]
Property, plant and equipment	36,126	37,265
Machinery and Equipment [Member]
Property, plant and equipment	$ 64,707	$ 64,791

[1] Derived from December 29, 2018 audited financial statements