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Note 13 - Common Stock Warrants - Reconciliation of Common Stock Warrant Liabilities (Details) - USD ($)	12 Months Ended
	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

X

- 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

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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)
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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

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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

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