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Note 6 - Common Stock (Details Textual) - $ / shares | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
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) |  | 272,597 | 108,451 |
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 | 312,730 |  |

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