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Note 12 - Stockholders' Equity - Stock Options Plan (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Outstanding, Weighted Average Exercise Price (in dollars per share) |  | $ 6.46 | $ 6.82 | $ 6.82 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value |  | $ 14,200 |  | $ (870,558) | $ (1,071,121)
Grants (in shares) |  | 207,983 |  |  |
Grants, Weighted Average Exercise Price (in dollars per share) |  | $ 5.67 |  | $ 3.91 |
Terminations/forfeitures(2), Weighted Average Exercise Price (in dollars per share) |  | 6.72 |  | 6.55 |
Exercises (in shares) | 0 |  | 0 |  |
Exercises (in shares) | 0 |  | 0 |  |
Exercises, Weighted Average Exercise Price (in dollars per share) |  | 4.81 |  |  |
Outstanding, Weighted Average Exercise Price (in dollars per share) |  | $ 6.23 |  | $ 6.46 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value |  | $ 14,200 |  | $ (870,558) |
Vested as of September 30, 2025 (in shares) |  | 107,000 |  |  |
Vested as of September 30, 2025, Weighted Average Exercise Price (in dollars per share) |  | $ 7.39 |  |  |
Vested as of September 30, 2025 |  | $ (365,817) |  |  |
Vested and expected to vest as of September 30, 2025, Weighted Average Exercise Price (in dollars per share) |  | $ 6.23 |  |  |
ested and expected to vest as of June 30, 2025 |  | $ 14,200 |  |  |
Non-vested stock options outstanding Number of Shares (in shares) |  | 416,983 |  | 344,000 |
Non-vested stock options outstanding Weighted Average fair value (in dollars per share) |  | $ 2.76 |  | $ 3.12 |
Non-vested stock options outstanding Weighted Average exercise price (in dollars per share) |  | 5.34 |  | $ 6.25 |
Stock options granted Weighted Average fair value (in dollars per share) |  | 3.02 | $ 1.72 |  |
Stock options that vested Weighted Average fair value (in dollars per share) |  | 4.36 |  |  |
Stock options that vested Weighted Average exercise price (in dollars per share) |  | $ 8.07 |  |  |
Stock options that were terminated or forfeited Number of Shares (in shares) |  | 118,500 |  |  |
Stock options that were terminated or forfeited Weighted Average fair value (in dollars per share) |  | $ 3.68 |  |  |
Stock options that were terminated or forfeited Weighted Average exercise price (in dollars per share) |  | $ 6.72 |  |  |
Non-qualified Stock Options [Member] |  |  |  |  |
Outstanding (in shares) |  | 0 | 0 | 0 |
Grants (in shares) |  | 75,983 |  |  |
Exercises (in shares) |  | (0) |  |  |
Exercises (in shares) |  | 0 |  |  |
Outstanding (in shares) |  | 75,983 |  | 0 |
Vested as of September 30, 2025 (in shares) |  | 0 |  |  |
Vested and expected to vest as of September 30, 2025 (in shares) |  | 75,983 |  |  |
Reserved for future grants (in shares) |  | 0 |  |  |
The 2010 Stock Option and Incentive Plan [Member] |  |  |  |  |
Outstanding (in shares) |  | 183,500 | 188,500 | 188,500 |
Grants (in shares) |  | 0 |  | 0 |
Terminations/forfeitures(2) (in shares) |  | (38,000) |  | (5,000) |
Exercises (in shares) |  | (0) |  | 0 |
Exercises (in shares) |  | 0 |  | 0 |
Outstanding (in shares) |  | 145,500 |  | 183,500 |
Vested as of September 30, 2025 (in shares) |  | 145,500 |  |  |
Vested and expected to vest as of September 30, 2025 (in shares) |  | 145,500 |  |  |
Reserved for future grants (in shares) |  | 0 |  |  |
The 2017 Stock Option and Incentive Plan [Member] |  |  |  |  |
Outstanding (in shares) |  | 480,500 | 430,000 | 430,000 |
Grants (in shares) |  | 132,000 |  | 86,000 |
Terminations/forfeitures(2) (in shares) |  | (80,500) |  | (35,500) |
Exercises (in shares) |  | 15,000 |  | 0 |
Exercises (in shares) |  | (15,000) |  | 0 |
Outstanding (in shares) |  | 517,000 |  | 480,500 |
Vested as of September 30, 2025 (in shares) |  | 176,000 |  |  |
Vested and expected to vest as of September 30, 2025 (in shares) |  | 517,000 |  |  |
Reserved for future grants (in shares) |  | 100,000 |  |  |

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