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Note 6 - Property, Plant, and Equipment - Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, plant, and equipment $ 106,716 $ 96,806
Land and Land Improvements [Member]    
Property, plant, and equipment 3,191 3,191
Building and Building Improvements [Member]    
Property, plant, and equipment 28,939 28,241
Leasehold Improvements [Member]    
Property, plant, and equipment 2,553 2,759
Machinery and Equipment [Member]    
Property, plant, and equipment 58,602 54,633
Furniture, Fixtures, and Computers [Member]    
Property, plant, and equipment 6,820 6,419
Construction in Progress [Member]    
Property, plant, and equipment $ 6,611 $ 1,563