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9. Accrued Expenses (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Payables and Accruals [Abstract]        
Product warranty expense $ 10 $ 5 $ 18 $ 10