9. Income taxes (Details - Deferred tax assets) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax liabilities attributable to:
Accumulated depreciation and amortization	$ (2,062)	$ (1,784)
Total net deferred tax liabilities	(2,062)	(1,784)
Deferred tax assets attributable to:
Net operating losses	595	14
Capital loss carry-forward & investment impairment	115	122
Incentive compensation	448	255
Inventory	355	335
Allowances for doubtful accounts and discounts	109	161
Other	50	57
Total net deferred tax assets	1,673	944
Net deferred tax liabilities	$ (390)	$ (840)