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Note 11 - Share-based Compensation - Restricted Stock Transactions (Details) - Restricted Stock [Member]
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Outstanding (in shares) | shares 151,166
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares $ 18.44
Granted (in shares) | shares 67,204
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 13.52
Vested (in shares) | shares (43,706)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 18.30
Forfeited (in shares) | shares (17,420)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares $ 14.24
Outstanding (in shares) | shares 157,244
Outstanding, weighted average grant date fair value (in dollars per share) | $ / shares $ 16.84