Note 5 - Fair Value Measurement - Changes in Fair Value (Details) - Derivative Financial Instruments, Liabilities [Member] - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Balance | $ 233 | $ 1,550 |
| Gain on revaluation of warrants issued in 2021, June 2020, December 2019, and May 2019 equity financings | 133 | (1,317) |
| Balance | $ 366 | $ 233 |
| 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
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| 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://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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