Note 16 - Employee Benefits - Summary of Activity In Stock Option Plans (Details) - Employee Stock Option and Stock Appreciation Rights [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Outstanding, shares (in shares)	491,792	329,203	330,703
Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 21.32	$ 20.47	$ 20.44
Granted, shares (in shares)	0	177,489	0
Granted, Weighted- Average Exercise Price (in dollars per share)	$ 0	$ 21.85	$ 0
Exercised, shares (in shares)	(18,580)	(14,900)	(1,400)
Exercised, Weighted- Average Exercise Price (in dollars per share)	$ 20.21	$ 8.92	$ 12.01
Forfeited, shares (in shares)	0	0	0
Forfeited, Weighted- Average Exercise Price (in dollars per share)	$ 0	$ 0	$ 0
Expired, shares (in shares)	0	0	(100)
Expired, Weighted- Average Exercise Price (in dollars per share)	$ 0	$ 0	$ 18.26
Outstanding, shares (in shares)	473,212	491,792	329,203
Outstanding, Aggregate Intrinsic Value	$ 1,760
Outstanding, Remaining Contractual Term (Year)	5 years 11 months 23 days
Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 21.36	$ 21.32	$ 20.47
Exercisable, shares (in shares)	259,037	204,116	177,875
Exercisable, Aggregate Intrinsic Value	$ 1,262	$ 1,683	$ 1,118
Exercisable, Remaining Contractual Term (Year)	4 years 6 months 25 days	4 years 9 months 21 days	5 years 3 months 7 days
Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 20.33	$ 19.20	$ 17.07