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3. Property, Plant and Equipment (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Property, Plant and Equipment [Abstract]          
Interest capitalized     $ 147 $ 0 $ 135
Depreciation expense $ 1,096 $ 1,149 $ 2,234 $ 2,299