Note 10 - Share-based Compensation - Summary of Activity In Stock Option Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Exercised, shares (in shares)	(5,000)
Employee Stock Option and Stock Appreciation Rights [Member]
Outstanding, shares (in shares)		491,792	329,203
Outstanding, Weighted- Average Exercise Price (in dollars per share)		$ 21.32	$ 20.47
Granted, shares (in shares)		0	177,489
Granted, Weighted- Average Exercise Price (in dollars per share)		$ 0	$ 21.85
Exercised, shares (in shares)		(14,996)	(5,800)
Exercised, Weighted- Average Exercise Price (in dollars per share)		$ 19.46	$ 3.85
Forfeited, shares (in shares)		0	0
Forfeited, Weighted- Average Exercise Price (in dollars per share)		$ 0	$ 0
Expired, shares (in shares)		0	0
Expired, Weighted- Average Exercise Price (in dollars per share)		$ 0	$ 0
Outstanding, shares (in shares)	500,892	476,796	500,892
Outstanding, Aggregate Intrinsic Value	$ 1,808	$ 2,651	$ 1,808
Outstanding, Remaining Contractual Term (Year)		6 years 2 months 26 days	7 years 1 month 13 days
Outstanding, Weighted- Average Exercise Price (in dollars per share)	$ 21.15	$ 21.38	$ 21.15
Exercisable, shares (in shares)	213,216	262,622	213,216
Exercisable, Aggregate Intrinsic Value	$ 1,287	$ 1,724	$ 1,287
Exercisable, Remaining Contractual Term (Year)		4 years 10 months 9 days	5 years
Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 18.90	$ 20.38	$ 18.90