Note 9 - Equity Incentive Plan - Summary of Stock Option Activity (Details) - The 2017 Equity Award Plan [Member] - USD ($) |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2026 |
Dec. 31, 2025 |
|
| Outstanding balance, number of shares subject to option (in shares) | 423,034 | |
| Outstanding, weighted average exercise price (in dollars per share) | $ 1.12 | |
| Outstanding balance, weighted average remaining contractual term (Year) | 2 years 7 months 24 days | 2 years 7 months 17 days |
| Outstanding, aggregate intrinsic value | $ 13,000 | $ 180,000 |
| Exercised, number of shares subject to option (in shares) | (50,000) | |
| Exercised, weighted average exercise price (in dollars per share) | $ 0.78 | |
| Outstanding balance, number of shares subject to option (in shares) | 373,034 | 423,034 |
| Outstanding, weighted average exercise price (in dollars per share) | $ 1.17 | $ 1.12 |
| X | ||||||||||
- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Weighted-average contractual term remaining for option award outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Details
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