Note 13 - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding-Number of options (in shares)	109,150	113,950	116,550
Exercised-Number of options (in shares)			(19,025)
Forfeited-Number of options (in shares)	(22,600)	(34,150)	(8,575)
Granted-Number of options (in shares)	35,000	29,350	25,000
Outstanding ending-Number of options (in shares)	121,550	109,150	113,950
Exercisable-Number of options (in shares)	41,375
Outstanding-Weighted average exercise price (in dollars per share)	$ 37.65	$ 37.58	$ 37.42
Exercised-Weighted average exercise price (in dollars per share)			30.97
Forfeited-Weighted average exercise price (in dollars per share)	43.15	37.07	35.27
Granted-Weighted average exercise price (in dollars per share)	29.51	37.26	32.5
Outstanding ending-Weighted average exercise price (in dollars per share)	34.29	$ 37.65	$ 37.58
Exercisable-Weighted average exercise price (in dollars per share)	$ 37.37
Outstanding ending-Weighted average remaining contractual term	3 years 9 months 29 days
Exercisable-Weighted average remaining contractual term	7 months 6 days