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Note 7 - Property, Plant and Equipment - Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, plant, and equipment $ 118,388 $ 116,089
Land and Land Improvements [Member]    
Property, plant, and equipment 3,191 3,191
Building and Building Improvements [Member]    
Property, plant, and equipment 36,017 35,502
Leasehold Improvements [Member]    
Property, plant, and equipment 3,160 3,022
Machinery and Equipment [Member]    
Property, plant, and equipment 67,880 66,438
Furniture, Fixtures, and Computers [Member]    
Property, plant, and equipment 6,135 6,414
Construction in Progress [Member]    
Property, plant, and equipment $ 2,005 $ 1,522