Note 10 - Employee Benefits - Non-vested Performance Unit Award Activity (Details) - Performance Shares [Member]	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Nonvested, shares (in shares) | shares	121,867
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 17.83
Granted, shares (in shares) | shares	114,044
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 20.49
Vested, shares (in shares) | shares	(47,511)	[1]
Vested, shares (in dollars per share) | $ / shares	$ (17.56)
Nonvested, shares (in shares) | shares	188,400
Nonvested, weighted average grant date fair value (in dollars per share) | $ / shares	$ 19.51

[1] This number of performance unit award shares vested based on our financial performance in 2023 and will be distributed in March 2024. The fair value of unit award shares that vested in 2023 was $834,000.