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Note 13 - Warrant Liability (Details Textual) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended
	Sep. 09, 2022	Sep. 30, 2022	Dec. 31, 2021	Nov. 30, 2021	Nov. 02, 2021	Oct. 29, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Aug. 13, 2019
Class of Warrant or Right, Outstanding (in shares)		2,282,000	7,082,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.59	$ 1.63
Class of Warrant or Right, Exercised During Period (in shares)		11,475,000
The 2019 Domestic Warrants [Member]
Warrants and Rights Outstanding							$ 4.9		$ 3.1	$ 3.1
Class of Warrant or Right, Outstanding (in shares)		0
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 1.15
Warrants and Rights Outstanding							4.9		$ 3.1	3.1
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
Warrants and Rights Outstanding							4.2			2.0
The 2019 Ladenburg Warrants [Member]
Warrants and Rights Outstanding							0.2			0.1
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									167,942
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)								$ 0.99	$ 1.25
Warrants and Rights Outstanding							$ 0.2			$ 0.1
Amended July 2020 Warrants [Member]
Warrants and Rights Outstanding	$ 0.3	$ 0.1
Class of Warrant or Right, Outstanding (in shares)	2,700,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	4,800,000	4,800,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.18	$ 0.18
Class of Warrant or Right, Exercised During Period (in shares)	2,100,000
Warrants and Rights Outstanding	$ 0.3	$ 0.1
The 2021 Warrants [Member]
Warrants and Rights Outstanding			$ 9.6		$ 14.2
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)						37,500,000
Warrants and Rights Outstanding			$ 9.6		$ 14.2
The November 2021 Warrants [Member]
Warrants and Rights Outstanding	$ 3.5	$ 1.9
Class of Warrant or Right, Outstanding (in shares)		28,125,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.18			$ 0.53
Class of Warrant or Right, Exercised During Period (in shares)	9,375,000
Warrants and Rights Outstanding	$ 3.5	$ 1.9
September 2022 Warrants [Member]
Warrants and Rights Outstanding	$ 1.4	0.8
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.18
Warrants and Rights Outstanding	$ 1.4	$ 0.8

X

- Definition

The number of warrants or rights exercised during period.

+ References

No definition available.

+ Details

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X

- 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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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
-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

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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.

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