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Note 8 - Property, Plant & Equipment - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Property, plant and equipment, gross $ 373,501 $ 376,001
Less accumulated depreciation and amortization (171,505) (167,772)
Property, plant and equipment, net before construction in progress and land 201,996 208,229
Property, plant and equipment, net 236,774 243,035
Land Improvements [Member]    
Property, plant and equipment, gross 806 806
Building and Building Improvements [Member]    
Property, plant and equipment, gross 89,248 89,698
Machinery and Equipment [Member]    
Property, plant and equipment, gross 264,554 266,386
Furniture and Fixtures [Member]    
Property, plant and equipment, gross 5,639 5,658
Computer Equipment and Software [Member]    
Property, plant and equipment, gross 12,517 12,727
Vehicles [Member]    
Property, plant and equipment, gross 737 726
Construction in Progress [Member]    
Property, plant and equipment, net 33,677 33,705
Land [Member]    
Property, plant and equipment, net $ 1,101 $ 1,101