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