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Note 12 - Property, Plant and Equipment - Property, Plant and Equipment Components (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Gross property, plant and equipment $ 69,616 $ 66,911
Accumulated depreciation (54,850) (51,337)
Property plant and equipment net 14,766 15,574
Land and Land Improvements [Member]    
Gross property, plant and equipment 219 219
Building and Building Improvements [Member]    
Gross property, plant and equipment 11,287 11,140
Property, Plant and Equipment, Other Types [Member]    
Gross property, plant and equipment 56,506 54,554
Construction in Progress [Member]    
Gross property, plant and equipment $ 1,604 $ 998