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3. Property, Plant and Equipment (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 1,253 $ 1,103 $ 3,515 $ 3,337