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10. Stock-Based Compensation (Details) - Options - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Shares available for grant, beginning 149 196
Shares available for grant authorized 855 655
Shares available for grant granted (116) (1,148)
Shares available for grant exercised 0 0
Shares available for grant forfeited/expired 259 446
Shares available for grant, ending 147 149
Number of outstanding, beginning 2,889 2,189
Number of shares granted 0 1,148
Number of shares forfeited/expired 1,116 (2)
Number of shares exercised (259) (446)
Number of outstanding, ending 3,746 2,889
Weighted average exercise price outstanding, beginning $ 1.80 $ 2.70
Weighted average exercise price granted 0 1.07
Weighted average exercise price forfeited/expired .78 .67
Weighted average exercise price exercised 3.53 4.35
Weighted average exercise price outstanding, ending $ 1.38 $ 1.80