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Note 13 - Common Stock Warrants - Reconciliation of Common Stock Warrant Liabilities (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
The 2022 Warrant Reprice Transaction [Member] |  |
Fair value of warrant liabilities recognized |  | $ 5,241,000
Warrant Liability [Member] |  |
Fair value of warrant liability, balance | $ 0 | 9,558,000
Fair value of warrant liability, balance | 334,000 | 0
Warrant Liability [Member] | The November 2021 Warrants [Member] |  |
Decrease in fair value of warrants |  | (2,056,000)
Reclassification of Warrants |  | (7,502,000)
Reclassification of Warrants |  | 7,502,000
Warrant Liability [Member] | The 2022 Warrant Reprice Transaction [Member] |  |
Decrease in fair value of warrants |  | (3,390,000)
Reclassification of Warrants |  | 1,851,000
Reclassification of Warrants |  | $ (1,851,000)
Warrant Liability [Member] | May 2023 Warrants [Member] |  |
Decrease in fair value of warrants | (216,000) |
Reclassification of Warrants | 1,360 |
Fair value of warrant liabilities recognized | 1,576,000 |
Reclassification of Warrants | (1,360) |
Warrant Liability [Member] | The December 2023 Warrants [Member] |  |
Decrease in fair value of warrants | (56,000) |
Fair value of warrant liabilities recognized | $ 390 |

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of issuances 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of settlements 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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