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Note 8 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
$ in Thousands
Apr. 03, 2022
Dec. 31, 2021
Gross property, plant and equipment $ 71,744 $ 69,814
Accumulated depreciation (57,181) (55,674)
Property, Plant and Equipment, Net, Total 14,563 14,140
Land and Land Improvements [Member]    
Gross property, plant and equipment 43 43
Building and Building Improvements [Member]    
Gross property, plant and equipment 7,960 7,863
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 62,617 61,050
Construction in Progress [Member]    
Gross property, plant and equipment $ 1,124 $ 858