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Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Property, plant and equipment, gross $ 1,179,564 $ 1,191,864
Less: Accumulated depreciation (950,570) (919,157)
Total property, plant and equipment, net 228,994 272,707
Land [Member]    
Property, plant and equipment, gross 30,892 30,869
Land Improvements [Member]    
Property, plant and equipment, gross $ 7,621 7,620
Land Improvements [Member] | Minimum [Member]    
Estimated useful lives (Year) 8 years  
Land Improvements [Member] | Maximum [Member]    
Estimated useful lives (Year) 15 years  
Building and Building Improvements [Member]    
Property, plant and equipment, gross $ 113,196 121,105
Building and Building Improvements [Member] | Minimum [Member]    
Estimated useful lives (Year) 13 years  
Building and Building Improvements [Member] | Maximum [Member]    
Estimated useful lives (Year) 39 years  
Machinery and Equipment [Member]    
Property, plant and equipment, gross $ 906,859 897,398
Machinery and Equipment [Member] | Minimum [Member]    
Estimated useful lives (Year) 2 years  
Machinery and Equipment [Member] | Maximum [Member]    
Estimated useful lives (Year) 7 years  
Other Machinery and Equipment [Member]    
Property, plant and equipment, gross $ 51,961 54,842
Estimated useful lives (Year) 7 years  
Furniture, Fixtures and Computers [Member]    
Property, plant and equipment, gross $ 20,040 16,928
Furniture, Fixtures and Computers [Member] | Minimum [Member]    
Estimated useful lives (Year) 3 years  
Furniture, Fixtures and Computers [Member] | Maximum [Member]    
Estimated useful lives (Year) 5 years  
Vehicles [Member]    
Property, plant and equipment, gross $ 25,704 25,948
Estimated useful lives (Year) 5 years  
Leasehold Improvements [Member]    
Property, plant and equipment, gross $ 12,536 12,773
Construction in Progress [Member]    
Property, plant and equipment, gross $ 10,755 $ 24,381