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10. Stock-based Compensation (Details - Option Activity) - Options [Member]
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Options outstanding, beginning balance | shares 45
Options granted | shares 0
Options exercised | shares 0
Options forfeited | shares 0
Options outstanding, ending balance | shares 45
Options exercisable | shares 29
Weighted average exercise price, options outstanding, beginning balance | $ / shares $ 10.45
Weighted average exercise price, options granted | $ / shares
Weighted average exercise price, options exercised | $ / shares
Weighted average exercise price, options forfeited | $ / shares
Weighted average exercise price, options outstanding, ending balance | $ / shares 10.45
Weighted average exercise price, options exercisable | $ / shares $ 10.42
Weighted average remaining contractural life, outstanding 8 years 2 months 12 days
Weighted average remaining contractural life, exercisable 8 years 2 months 12 days
Aggregate intrinsic value, options outstanding | $ $ 0
Aggregate intrinsic value, options exercisable | $ $ 0