Note 8 - Share-based Compensation - Stock Option Activity Under Equity Incentive Plans and Director Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)	22,360	75,283	87,378
Service based Stock Options [Member]
Beginning balance, outstanding, number of options (in shares)	470,321
Expected dividend yield at date of grant	4.73%	1.94%	2.13%
Beginning balance, outstanding, weighted average exercise price (in dollars per share)	$ 35.38
Expected stock price volatility	32.55%	33.75%	35.12%
Granted, number of options (in shares)	253,481	54,530	96,359
Risk-free interest rate	3.83%	4.50%	3.61%
Granted, weighted average exercise price (in dollars per share)	$ 12.88
Expected life of options (in years) (Year)	5 years 1 month 17 days	5 years	6 years 10 months 6 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)	22,360
Exercised, weighted average exercise price (in dollars per share)	$ 14.31
Expired, number (in shares)	59,965
Forfeited, number of options (in shares)	32,695
Expired, weighted average exercise price (in dollars per share)	$ 24.7
Forfeited, weighted average exercise price (in dollars per share)	$ 41.29
Outstanding, number (in shares)	608,782	470,321
Forfeited, weighted average exercise price (in dollars per share)	$ 41.29
Outstanding, weighted average exercise price (in dollars per share)	$ 27.52	$ 35.38
Outstanding, weighted average contractual term (Year)	7 years 1 month 9 days
Outstanding, aggregate intrinsic value	$ 1,526
Exercisable, number (in shares)	378,233
Exercisable, weighted average exercise price (in dollars per share)	$ 32.84
Exercisable, weighted average remaining contractual term (Year)	6 years 1 month 24 days
Exercisable, aggregate intrinsic value	$ 518
Performance based Stock Options [Member]
Beginning balance, outstanding, number of options (in shares)	404,833
Expected dividend yield at date of grant		1.44%
Beginning balance, outstanding, weighted average exercise price (in dollars per share)	$ 39.54
Expected stock price volatility		33.83%
Granted, number of options (in shares)	0	404,833	0
Risk-free interest rate		4.13%
Expected life of options (in years) (Year)		4 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)	0
Forfeited, number of options (in shares)	300,000
Forfeited, weighted average exercise price (in dollars per share)	$ 39.54
Outstanding, number (in shares)	104,833	404,833
Forfeited, weighted average exercise price (in dollars per share)	$ 39.54
Outstanding, weighted average exercise price (in dollars per share)	$ 39.54	$ 39.54
Outstanding, weighted average contractual term (Year)	4 years 18 days
Outstanding, aggregate intrinsic value	$ 0
Exercisable, number (in shares)	0