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Note 11 - Common Stock Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended
	Dec. 21, 2023	May 01, 2023	Sep. 09, 2022	Mar. 31, 2024	Mar. 31, 2023	Mar. 24, 2024	Dec. 31, 2023	Dec. 31, 2022	Nov. 10, 2022	Nov. 30, 2021	Sep. 09, 2020	Jul. 31, 2020
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 1.6	$ 7.7		$ 1.82	$ 7.7
Class of Warrant or Right, Exercised During Period (in shares)				(0)	0
Fair Value Adjustment of Warrants				$ (194)	$ (0)
March 2024 Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						1,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 0.14		$ 0.14
Warrants and Rights, Vesting Period (Month)				6 months
Warrants and Rights Outstanding, Term (Year)				5 years
The December 2023 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				2,528,848
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 0.25
The May 2023 B-1 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		2,538,464
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 1.3	$ 1.3		1.3
Class of Warrant or Right, Exercised During Period (in shares)	634,616
The May 2023 B-2 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		2,538,464
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.3		1.3
Class of Warrant or Right, Exercised During Period (in shares)	1,894,232
The 2023 Warrant Reprice Transaction [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							2,528,848
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.25						$ 0.25
May 2023 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							2,528,848
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 1.3
Fair Value Adjustment of Warrants	$ 200
The November 2022 A-1 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		436,510							515,876
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				6.3					$ 6.3
The November 2022 A-2 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		436,510							515,876
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				6.3					$ 6.3
The November 2022 A-1 and A-2 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 6.3
The Amended November 2022 A-1 and A-2 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.5
Fair Value Adjustment of Warrants		$ 100
The 2022 Warrant Reprice Transaction [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			327,860
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 6.3	$ 6.3
September 2022 Warrants Exercisable for 1.50 [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		238,574
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.5
Fair Value Adjustment of Warrants		$ 46
The November 2021 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		535,716								1,071,434
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				6.3						$ 18.55
Amended November 2021 Warrants Exercisable for 6.50 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 6.3	$ 6.3
Class of Warrant or Right, Exercised During Period (in shares)			267,860
Fair Value Adjustment of Warrants			$ 1,500
Amended November 2021 Warrants Exercisable for 1.50 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.5
Fair Value Adjustment of Warrants		$ 100
The July 2020 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)											137,145	197,105
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 57.75								$ 57.75
Amended July 2020 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		77,145
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 6.3	$ 6.3
Class of Warrant or Right, Exercised During Period (in shares)			60,000
Fair Value Adjustment of Warrants		$ 14,000	$ 400
The 2023 Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		5,076,928
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.5
Fair Value Adjustment of Warrants		$ 400

X

- Definition

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+ References

No definition available.

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- Definition

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 25
-Paragraph 13
-SubTopic 10
-Topic 480
-Publisher FASB
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+ 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
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-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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