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3. Property, Plant and Equipment (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Property, Plant and Equipment [Abstract]      
Interest capitalized $ 64 $ 0 $ 135
Depreciation expense $ 1,138 $ 1,150