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Note 7 - Stock-Based Compensation Expense (Details Textual) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 2.22 $ 0
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 1,894,027,000,000 $ 515,969  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 3 months 18 days 1 year 9 months 18 days