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3. Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of warrant activity    
Land $ 2,738 $ 2,713
Plant and Buildings 82,282 81,755
Furniture and fixtures 603 572
Machinery and equipment 4,353 4,308
Construction in progress 104 88
Total gross property, plant & equipment 90,080 89,436
Less accumulated depreciation (24,410) (23,066)
Total net property, plant & equipment $ 65,670 $ 66,370