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Note 1 - Assumptions Used in Option Pricing Model (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]      
Risk free interest rate 3.64% 1.25% 0.20%
Dividend yield 4.80% 3.64% 4.17%
Volatility 20.36% 22.68% 21.14%
Expected life (years) 8 years 4 months 6 days 4 years 18 days 4 years 10 days