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Note 6 - Long-lived Assets - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Less: accumulated depreciation $ (11,966) $ (14,522)
Subtotal 7,599 5,986
Construction-in-progress 3,288 2,742
Property, plant and equipment, net 10,887 8,728
Land [Member]    
Property, Plant and Equipment, Gross 2,239 2,332
Building and Building Improvements [Member]    
Property, Plant and Equipment, Gross $ 4,899 5,066
Building and Building Improvements [Member] | Minimum [Member]    
Estimated Useful Lives (Year) 15 years  
Building and Building Improvements [Member] | Maximum [Member]    
Estimated Useful Lives (Year) 40 years  
Machinery and Equipment [Member]    
Property, Plant and Equipment, Gross $ 9,514 10,104
Machinery and Equipment [Member] | Minimum [Member]    
Estimated Useful Lives (Year) 5 years  
Machinery and Equipment [Member] | Maximum [Member]    
Estimated Useful Lives (Year) 8 years  
Furniture and Fixtures [Member]    
Property, Plant and Equipment, Gross $ 2,913 $ 3,006
Furniture and Fixtures [Member] | Minimum [Member]    
Estimated Useful Lives (Year) 3 years  
Furniture and Fixtures [Member] | Maximum [Member]    
Estimated Useful Lives (Year) 5 years