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Note 3 - Property, Plant and Equipment - Schedule of Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Land $ 7,347 $ 7,344
Plant and buildings 137,558 99,116
Furniture and fixtures 1,927 1,831
Machinery and equipment 14,946 15,209
Tenant improvements 56 56
Construction in progress 52,573 88,934
Property held for development 15,431 15,437
Total gross property, plant & equipment 232,880 230,972
Less accumulated depreciation (52,072) (50,531)
Total net property, plant & equipment 180,808 180,441
Property, Plant and Equipment [Member]    
Finance lease right of use assets $ 3,042 $ 3,045