10. Income taxes (Details - Deferred tax assets) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Non-current deferred tax assets (liabilities) arising from:
Accumulated depreciation and amortization	$ (1,854)	$ (1,719)
Total non-current net deferred tax liabilities	(1,854)	(1,719)
Current deferred tax assets arising from:
Capital loss carry-forward & investment impairment	166	164
Unrealized losses (gain) on investments	0	45
Share-based and other compensation	126	0
Inventory	331	308
Allowance for doubtful accounts and discounts	39	39
Total current deferred tax assets	662	556
Net deferred tax liability	$ (1,192)	$ (1,163)