Note 7 - Stock Compensation Plans - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member]	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Unvested, beginning of year (in shares) | shares	41,507
Unvested, beginning of year, weighted average grant date fair value (in dollars per share) | $ / shares	$ 18.47
Granted, shares (in shares) | shares	13,412
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 19.06
Vested, shares (in shares) | shares	(17,762)
Vested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 19.59
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	37,157
Unvested, end of period, weighted average grant date fair value (in dollars per share) | $ / shares	$ 18.25