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Note 5 - Stock-based Compensation - Schedule of Valuation Assumptions (Details) - Performance Shares [Member] - Monte Carlo Input [Member] - $ / shares
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Stock price (in dollars per share) $ 0 $ 39.49
Expected volatility 0.00% 66.30%
Risk-free interest rate 0.00% 4.30%