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Note 12 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
$ in Thousands
Apr. 02, 2017
Dec. 31, 2016
Gross property, plant and equipment $ 87,739 $ 87,416
Accumulated depreciation (70,294) (69,473)
Property plant and equipment net 17,445 17,943
Land and Land Improvements [Member]    
Gross property, plant and equipment 219 219
Building and Building Improvements [Member]    
Gross property, plant and equipment 10,630 10,056
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 74,296 76,495
Construction in Progress [Member]    
Gross property, plant and equipment $ 2,594 $ 646