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8. Stockholders' Equity (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Total shares purchased 23,638
Total number of shares purchased as part of publicly announced plan 23,638
July 2020  
Total shares purchased 675
Average price per share | $ / shares $ 6.21
Total number of shares purchased as part of publicly announced plan 675
Approximate dollar value of shares that may be purchased under the plan | $ $ 1,200,000
August 2020  
Total shares purchased 22,963
Average price per share | $ / shares $ 6.20
Total number of shares purchased as part of publicly announced plan 22,963
Approximate dollar value of shares that may be purchased under the plan | $ $ 1,000,000