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3. Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of warrant activity    
Land $ 2,740 $ 2,713
Plant and Buildings 82,341 81,755
Furniture and fixtures 603 572
Machinery and equipment 4,326 4,308
Construction in progress 539 88
Total gross property, plant & equipment 90,549 89,436
Less accumulated depreciation (25,529) (23,066)
Total net property, plant & equipment $ 65,020 $ 66,370