Note 10 - Employee Benefits - Option Activity (Details)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Outstanding at December 31, 2022 (in shares) | shares	915,391
Outstanding at December 31, 2022 (in dollars per share) | $ / shares	$ 15.84
Granted, shares (in shares) | shares	39,000
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 21.44
Exercised, shares (in shares) | shares	(106,941)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 11.3
Forfeited, shares (in shares) | shares	(9,300)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	$ 18.35
Balance, shares (in shares) | shares	838,150
Balance, weighted average exercise price (in dollars per share) | $ / shares	$ 16.65
Exercisable, shares (in shares) | shares	431,850
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 15.12