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Note 11 - Stock Compensation - Estimate Valuation Assumptions (Details) - Performance Share Units [Member]
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Expect term (in years) (Year) 3 years 3 years
Risk-free interest rate 4.28% 1.78%
Dividend yield 2.50% 1.67%
Expected volatility 67.00% 63.90%