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Note 11 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
$ in Thousands
Sep. 29, 2019
Dec. 31, 2018
Gross property, plant and equipment $ 74,764 $ 72,717
Accumulated depreciation (61,502) (58,062)
Property plant and equipment net 13,262 14,655
Land and Land Improvements [Member]    
Gross property, plant and equipment 219 219
Building and Building Improvements [Member]    
Gross property, plant and equipment 11,238 11,178
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 62,816 59,179
Construction in Progress [Member]    
Gross property, plant and equipment $ 492 $ 2,141