Note 8 - Share-based Compensation - Stock Options Valuation Assumptions (Details) - Service based Stock Options [Member]	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Expected dividend yield at date of grant	4.73%	1.94%	2.13%
Expected stock price volatility	32.55%	33.75%	35.12%
Risk-free interest rate	3.83%	4.50%	3.61%
Expected life of options (in years) (Year)	5 years 1 month 17 days	5 years	6 years 10 months 6 days