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Note 5 - Common Stock (Details Textual) - $ / shares | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Common Stock, Shares Authorized (in shares) | 50,000,000 |  | 50,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 |  | $ 0.001
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) | 108,451 | 2,500 |
The Two Thousand Eighteen Equity Incentive Plan Member |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) | 108,451 | 2,500 |

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