Note 6 - Stockholders' (Deficit) Equity and Equity-linked Instruments - Schedule of Warrant Activity (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Ending balance | $ 74,000 | $ 665,000 | $ 74,000 | $ 665,000 |
| Series AAA-3 and AAA-4 Junior Preferred Stock Warrants [Member] | ||||
| Beginning balance | 78,000 | 2,332,000 | 348,000 | 1,571,000 |
| Change in fair value | (58,000) | (1,667,000) | (328,000) | (906,000) |
| Beginning balance | 20,000 | 665,000 | 20,000 | 665,000 |
| Warrants Issued With Placement Agent Agreement [Member] | ||||
| Beginning balance | 140,000 | 0 | 587,000 | 0 |
| Change in fair value | (86,000) | 0 | (533,000) | 0 |
| Ending balance | $ 54,000 | $ 0 | $ 54,000 | $ 0 |
| X | ||||||||||
- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|