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Note 13 - Warrant Liability (Details Textual) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Sep. 09, 2022	Dec. 31, 2022	Nov. 10, 2022	Dec. 31, 2021	Nov. 02, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Aug. 13, 2019
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 7.70		$ 57.13		$ 57.13
Class of Warrant or Right, Exercised During Period (in shares)		327,000
Class of Warrant or Right, Outstanding (in shares)		2,306,000		202,000		201,000
September 2022 Warrants [Member]
Warrants and Rights Outstanding	$ 1.4		$ 0.5
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.18
The November 2021 Warrants [Member]
Warrants and Rights Outstanding			$ 1.3	$ 9.6	$ 14.2
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.18
Class of Warrant or Right, Exercised During Period (in shares)	9,375,000
Class of Warrant or Right, Exercised During Period, Accounting for Subsequent Stock Split (in shares)	267,857
Class of Warrant or Right, Outstanding (in shares)		803,574
Amended July 2020 Warrants [Member]
Warrants and Rights Outstanding	$ 0.3	$ 0.1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.18
Class of Warrant or Right, Exercised During Period (in shares)	2,100,000
Class of Warrant or Right, Exercised During Period, Accounting for Subsequent Stock Split (in shares)	60,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	4,800,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights, Accounting for Subsequent Stock Split (in shares)	137,145
Class of Warrant or Right, Outstanding (in shares)	2,700,000
Class of Warrant or Right, Outstanding, Accounting for Subsequent Stock Split (in shares)	77,145
The 2019 Domestic Warrants [Member]
Warrants and Rights Outstanding						$ 4.9		$ 3.1	$ 3.1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 1.15
Class of Warrant or Right, Outstanding (in shares)		0
The 2019 Foreign Warrants [Member]
Warrants and Rights Outstanding						4.2			2.0
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 0.99
Class of Warrant or Right, Outstanding (in shares)		0
The 2019 Ladenburg Warrants [Member]
Warrants and Rights Outstanding						$ 0.2			$ 0.1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 0.99
Class of Warrant or Right, Outstanding (in shares)		0

X

- Definition

The number of warrants or rights exercised during period.

+ References

No definition available.

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- Definition

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- Definition

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

+ References

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- Definition

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

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- 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

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