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3. Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Land $ 4,118 $ 4,116
Plant and Buildings 82,991 82,445
Furniture and fixtures 1,059 1,056
Machinery and equipment 4,211 3,928
Construction in progress 3,412 3,581
GAFI property, plant & equipment 15,408 15,408
Total gross property, plant & equipment 111,199 110,534
Less accumulated depreciation (33,205) (32,042)
Total net property, plant & equipment $ 77,994 $ 78,492