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Note 6 - Share-based Compensation - Non-vested Stock (Details) - Common Stock [Member]
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Outstanding (in shares) | shares 6,005
Outstanding (in dollars per share) | $ / shares $ 38.30
Granted (in shares) | shares 12,698
Granted (in dollars per share) | $ / shares $ 42.92
Forfeited (in shares) | shares (6,005)
Forfeited (in dollars per share) | $ / shares $ 38.30
Outstanding (in shares) | shares 12,698
Outstanding (in dollars per share) | $ / shares $ 42.92