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Note 7 - Stock Compensation Plans - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member]
 3 Months Ended
Mar. 31, 2023
$ / shares
shares
Unvested, beginning of year (in shares) | shares 29,181
Unvested, beginning of year, weighted average grant date fair value (in dollars per share) | $ / shares $ 20.31
Granted, shares (in shares) | shares 13,727
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 17.54
Vested, shares (in shares) | shares (11,401)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares $ 19.2
Forfeited, shares (in shares) | shares 0
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Unvested, end of period (in shares) | shares 31,507
Unvested, end of period, weighted average grant date fair value (in dollars per share) | $ / shares $ 20.31