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3. Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Land $ 4,108 $ 4,116
Plant and Buildings 83,244 82,445
Furniture and fixtures 1,093 1,056
Machinery and equipment 4,207 3,928
Construction in progress 8,076 3,581
GAFI property, plant & equipment 15,408 15,408
Total gross property, plant & equipment 116,136 110,534
Less accumulated depreciation (35,293) (32,042)
Total net property, plant & equipment $ 80,843 $ 78,492