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Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Restricted cash held as a certificate of deposit | $ 476 | $ 476
Warrant liabilities | 232 | 334
Embedded derivative liability | 159 |
Total liabilities | 391 |
Fair Value, Inputs, Level 1 [Member] |  |
Restricted cash held as a certificate of deposit | 476 | 476
Warrant liabilities | 0 | 0
Embedded derivative liability | 0 |
Total liabilities | 0 |
Fair Value, Inputs, Level 2 [Member] |  |
Restricted cash held as a certificate of deposit | 0 | 0
Warrant liabilities | 232 | 334
Embedded derivative liability | 159 |
Total liabilities | 391 |
Fair Value, Inputs, Level 3 [Member] |  |
Restricted cash held as a certificate of deposit | 0 | 0
Warrant liabilities | 0 | $ 0
Embedded derivative liability | 0 |
Total liabilities | $ 0 |

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- Definition Fair value portion of restricted cash held as a certificate of deposit. + References No definition available. + Details
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- Definition The fair value of warrant obligations. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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