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3. Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Abstract]    
Land $ 4,091 $ 4,092
Plant and buildings 97,249 97,398
Furniture and fixtures 1,191 1,195
Machinery and equipment 5,272 5,188
Construction in progress 30,032 25,397
Property held for development 15,408 15,408
Finance lease right of use assets 2,308 2,308
Total gross property, plant & equipment 155,551 150,986
Less accumulated depreciation (42,461) (41,106)
Total net property, plant & equipment $ 113,090 $ 109,880