Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock Based Compensation - Unvested Restricted Stock Activity (Details)

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Note 6 - Stock Based Compensation - Unvested Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Granted, unvested share (in shares) 39,849 84,327 3,000
Granted, weighted-average grant date fair value (in dollars per share) $ 21.15 $ 21.09 $ 20.00
Vested, unvested share (in shares) (87,252) (39,924) 0
Vested, weighted-average grant date fair value (in dollars per share) $ 21.06 $ 21.12 $ 0
Balance, unvested share (in shares) 47,403 3,000  
Balance, weighted-average grant date fair value (in dollars per share) $ 20.99 $ 20.00  
Balance, unvested share (in shares) 0 47,403 3,000
Balance, weighted-average grant date fair value (in dollars per share) $ 0 $ 20.99 $ 20.00