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Note 9 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
$ in Thousands
Apr. 05, 2020
Dec. 31, 2019
Gross property, plant and equipment $ 56,966 $ 64,049
Accumulated depreciation (47,279) (52,374)
Property plant and equipment net 9,687 11,675
Land and Land Improvements [Member]    
Gross property, plant and equipment 50 50
Building and Building Improvements [Member]    
Gross property, plant and equipment 7,111 8,108
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 49,198 55,520
Construction in Progress [Member]    
Gross property, plant and equipment $ 607 $ 371