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Note 11 - Common Stock Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended				3 Months Ended		6 Months Ended
	May 01, 2023	Sep. 09, 2022	Jun. 30, 2024	May 31, 2024	Dec. 31, 2023	May 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024	Mar. 24, 2024	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			$ 37.4		$ 50.96		$ 37.4	$ 76.23	$ 37.4	$ 76.23			$ 269.54
Class of Warrant or Right, Exercised During Period (in shares)									90,381,000	(0)
Fair Value Adjustment of Warrants							$ (80)	$ 216	$ 114	$ 216
Class of Warrant or Right, Forfeited During Period									(14,741,000)	0
Fair Value Adjustment of Warrants							$ 80	$ (216)	$ (114)	$ (216)
June 2024 Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			90,381				90,381		90,381
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 2.57				$ 2.57		$ 2.57
March 2024 Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights											28,572	28,572
Class of Warrant or Right, Exercise Price of Warrants or Rights			4.9				4.9		4.9		$ 4.9
The December 2023 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					72,256
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 8.75		$ 8.75		8.75		8.75
The May 2023 B-1 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights						72,528
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 45.5	$ 45.5
Class of Warrant or Right, Exercised During Period (in shares)			54,396		18,132
The May 2023 B-2 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights						72,528
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 45.5
Class of Warrant or Right, Exercised During Period (in shares)			18,408		54,120
May 2023 Warrants Amended By 2023 Warrant Reprice Transaction [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 8.75
May 2023 Warrants Amended By 2024 Warrant Reprice Transaction [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 2.5				2.5		2.5
May 2023 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					72,256
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 8.75		$ 45.5		$ 8.75		$ 8.75
Fair Value Adjustment of Warrants			$ 47		$ 170
Fair Value Adjustment of Warrants			$ (47)		$ (170)
The November 2022 A-1 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			12,473			12,473	12,473		12,473					14,741
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 220.5			$ 52.5	$ 220.5		$ 220.5					$ 220.5
The November 2022 A-2 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights						12,473								14,741
Class of Warrant or Right, Exercise Price of Warrants or Rights														$ 220.5
Class of Warrant or Right, Forfeited During Period				14,741
The November 2022 A-1 and A-2 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 220.5
The Amended November 2022 A-1 and A-2 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 52.5
Fair Value Adjustment of Warrants			$ (16)			$ (74)
Fair Value Adjustment of Warrants			$ 16			$ 74
November 2022 Warrants Amended By 2024 Warrant Reprice Transaction [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 2.5				$ 2.5		$ 2.5
The 2022 Warrant Reprice Transaction [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		9,371
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 220.5
September 2022 Warrants Amended in 2023 Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights						6,819
Class of Warrant or Right, Exercise Price of Warrants or Rights		52.5				$ 52.5
September 2022 Warrants Amended in 2024 Warrant Reprise Transaction [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			5,104				5,104		5,104
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 2.5				$ 2.5		$ 2.5
September 2022 Warrants Amended [Member]
Fair Value Adjustment of Warrants			$ (6)			$ (28)
Fair Value Adjustment of Warrants			$ 6			$ 28
The November 2021 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	15,308														30,616
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 220.5				220.5		220.5						$ 649.25
Amended November 2021 Warrants Exercisable for 6.50 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 220.5	$ 220.5
Class of Warrant or Right, Exercised During Period (in shares)		7,654
Fair Value Adjustment of Warrants		$ (1,500)
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	$ 52.5
Fair Value Adjustment of Warrants	$ (100)
Fair Value Adjustment of Warrants	$ 100
The July 2020 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																3,921	5,635
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 2,021.25				$ 2,021.25		$ 2,021.25								$ 2,021.25
Amended July 2020 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	2,206
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 220.5	$ 220.5
Class of Warrant or Right, Exercised During Period (in shares)		1,715
Fair Value Adjustment of Warrants	$ (9,000)	$ (400)
Fair Value Adjustment of Warrants	$ 9,000	$ 400
The 2023 Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	145,056
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 52.5
Fair Value Adjustment of Warrants	$ (400)
Fair Value Adjustment of Warrants	$ 400

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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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+ References

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

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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

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-Topic 480
-Publisher FASB
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