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Note 5 - Stock-Based Compensation - Schedule of Valuation Assumptions (Details) - Share-Based Payment Arrangement, Option [Member] - $ / shares
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Expected volatility 66.30% 74.70%
Risk-free interest rate 4.30% 4.30%
Monte Carlo Input [Member]    
Stock price (in dollars per share) $ 36.64 $ 22.37