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Note 7 - Property, Plant and Equipment, Net - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Property, plant and equipment, gross $ 167,065 $ 168,377
Accumulated depreciation (126,204) (126,434)
Property, plant and equipment, net 40,861 41,943
Land [Member]    
Property, plant and equipment, gross 1,423 1,431
Building and Building Improvements [Member]    
Property, plant and equipment, gross 30,550 29,722
Machinery and Equipment [Member]    
Property, plant and equipment, gross 132,447 132,134
Construction in Progress [Member]    
Property, plant and equipment, gross $ 2,645 $ 5,090