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Note 6 - Fair Value Measurements - Summary of Financial Assets Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Inputs, Level 1 [Member] | Warrant Liability [Member] |  |
Fair value of warrant liabilities | $ 0 | $ 0
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |
Assets | 17,998 | 20,023
Fair Value, Inputs, Level 1 [Member] | Restricted Cash [Member] |  |
Assets | 1,145 | 2,172
Fair Value, Inputs, Level 2 [Member] | Warrant Liability [Member] |  |
Fair value of warrant liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |
Assets | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Restricted Cash [Member] |  |
Assets | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Warrant Liability [Member] |  |
Fair value of warrant liabilities | 109 | 1,033
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] |  |
Assets | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Restricted Cash [Member] |  |
Assets | $ 0 | $ 0

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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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