11. Stock-based Compensation (Details - Option Activity) - Options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Options outstanding, beginning balance	41
Options granted	0
Options exercised	0
Options forfeited	0
Options outstanding, ending balance	41	41
Options exercisable	41
Weighted average exercise price, options outstanding, beginning balance	$ 10.42
Weighted average exercise price, options granted
Weighted average exercise price, options exercised
Weighted average exercise price, options forfeited
Weighted average exercise price, options outstanding, ending balance	10.42	$ 10.42
Weighted average exercise price, options exercisable	$ 10.42
Weighted average remaining contractural life, outstanding	4 years 11 months 19 days	5 years 2 months 19 days
Aggregate intrinsic value, options outstanding	$ 0
Aggregate intrinsic value, options exercisable	$ 0