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Note 7 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Dec. 10, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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) |  | 266,353 | 207,626 | 25,000
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  | 50,867 |
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  | $ 180 |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) |  | 80,933 | 86,782 | 69,884
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares) |  | 90,402 | 91,402 | 0
Securities Purchase Agreements [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 583,334 |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 12 |  |  |
Proceeds from Issuance of Common Stock | $ 7,000 |  |  |
The Two Thousand Eighteen Equity Incentive Plan Member |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  | 266,353 | 207,626 | 25,000
The Two Thousand Eighteen Equity Incentive Plan Member | Cashless Stock Awards [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) |  | 407,808 |  |

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