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Note 9 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
$ in Thousands
Jul. 04, 2021
Dec. 31, 2020
Gross property, plant and equipment $ 66,186 $ 64,019
Accumulated depreciation (54,873) (53,858)
Property plant and equipment net 11,313 10,161
Land and Land Improvements [Member]    
Gross property, plant and equipment 43 43
Building and Building Improvements [Member]    
Gross property, plant and equipment 7,776 7,747
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 57,207 55,620
Construction in Progress [Member]    
Gross property, plant and equipment $ 1,160 $ 609