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3. Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Abstract]    
Land $ 4,092 $ 4,104
Plant and buildings 97,398 83,139
Furniture and fixtures 1,195 1,094
Machinery and equipment 5,188 4,252
Construction in progress 25,397 12,571
Property held for development 15,408 15,408
Finance lease right of use assets 2,308 0
Total gross property, plant & equipment 150,986 120,568
Less accumulated depreciation (41,106) (36,342)
Total net property, plant & equipment $ 109,880 $ 84,226