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Note 13 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Property, plant and equipment, gross $ 841,968 $ 830,694
Less: accumulated depreciation (377,486) (352,114)
Property, plant and equipment, net 464,482 478,580
Property, Plant and Equipment, Net [Member]    
Assets under finance lease, gross 19,898 19,898
Less: accumulated amortization, assets under finance lease 8,074 7,733
Total 11,824 12,165
Land [Member]    
Property, plant and equipment, gross 21,860 21,580
Building [Member]    
Assets under finance lease, gross 18,623 18,623
Land Improvements [Member]    
Property, plant and equipment, gross 3,056 3,054
Plant and Equipment [Member]    
Property, plant and equipment, gross 714,072 701,400
Assets under finance lease, gross 1,275 1,275
Buildings and Leasehold Improvement [Member]    
Property, plant and equipment, gross $ 102,980 $ 104,660