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Note 11 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
$ in Thousands
Apr. 01, 2018
Dec. 31, 2017
Gross property, plant and equipment $ 64,653 $ 62,083
Accumulated depreciation (48,947) (46,509)
Property plant and equipment net 15,706 15,574
Land and Land Improvements [Member]    
Gross property, plant and equipment 219 219
Building and Building Improvements [Member]    
Gross property, plant and equipment 11,367 11,140
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 51,858 49,726
Construction in Progress [Member]    
Gross property, plant and equipment $ 1,209 $ 998