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Note 10 - Common Stock Warrants - Reconciliation of Common Stock Warrant Liabilities (Details) - Warrant Liability [Member] $ in Thousands | 3 Months Ended
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Mar. 31, 2024 USD ($)
Warrant liabilities | $ 334
Warrant liabilities | 232
The December 2023 Warrants [Member] |
Change in fair value of warrant liability during period | (173)
March 2024 Warrant [Member] |
Change in fair value of warrant liability during period | (21)
Fair value of March 2024 Warrant upon issuance | $ 92

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