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Note 11 - Warrant Liability (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	May 01, 2023	Apr. 26, 2023	Nov. 10, 2022	Sep. 09, 2022	Jan. 31, 2022	Dec. 31, 2021
Fair Value Adjustment of Warrants	$ (216)	$ (0)	$ (216)	$ (2,056)
May 2023 Warrants [Member]
Warrants and Rights Outstanding	1,400		1,400		$ 1,600
Fair Value Adjustment of Warrants			216
September 2022 Warrants [Member]
Warrants and Rights Outstanding	$ 94		94			$ 48	$ 500	$ 1,400
Fair Value Adjustment of Warrants			$ 46
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	327,860		327,860
The November 2021 Warrants [Member]
Warrants and Rights Outstanding	$ 230		$ 230			$ 112	1,300		$ 7,500	$ 9,600
Fair Value Adjustment of Warrants			$ 117
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	803,574		803,574
The Amended November 2021 Warrants [Member]
Warrants and Rights Outstanding								$ 3,500
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								803,574
Amended July 2020 Warrants [Member]
Warrants and Rights Outstanding							$ 100	$ 300
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	77,145		77,145
Class of Warrant or Right, Outstanding, Accounting for Subsequent Stock Split (in shares)								77,145

X

- Definition

Number of warrants or rights outstanding, accounting for subsequent stock split.

+ References

No definition available.

+ Details

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X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ 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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X

- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ 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
-URI https://asc.fasb.org//1943274/2147481766/480-10-25-13

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X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

No definition available.

+ Details

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