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Note 13 - Warrant Liability - The Key Assumptions Used to Value the Warrants (Details)	Dec. 31, 2021	Nov. 02, 2021	Dec. 31, 2019
Warrants assumptions	0.25	0.38
Measurement Input, Price Volatility [Member] | The 2019 Domestic Warrants [Member]
Warrants assumptions			1.78
Measurement Input, Price Volatility [Member] | The 2019 Foreign Warrants [Member]
Warrants assumptions			1.78
Measurement Input, Price Volatility [Member] | The 2019 Ladenburg Warrants [Member]
Warrants assumptions			1.86
Measurement Input, Price Volatility [Member] | The 2021 Warrants [Member]
Warrants assumptions	0.87	0.849
Measurement Input, Expected Term [Member] | The 2019 Domestic Warrants [Member]
Warrants assumptions			4.57
Measurement Input, Expected Term [Member] | The 2019 Foreign Warrants [Member]
Warrants assumptions			4.57
Measurement Input, Expected Term [Member] | The 2019 Ladenburg Warrants [Member]
Warrants assumptions			4.05
Measurement Input, Expected Term [Member] | The 2021 Warrants [Member]
Warrants assumptions	6.0	6.2
Measurement Input, Risk Free Interest Rate [Member] | The 2019 Domestic Warrants [Member]
Warrants assumptions			0.0025
Measurement Input, Risk Free Interest Rate [Member] | The 2019 Foreign Warrants [Member]
Warrants assumptions			0.0027
Measurement Input, Risk Free Interest Rate [Member] | The 2019 Ladenburg Warrants [Member]
Warrants assumptions			0.0022
Measurement Input, Risk Free Interest Rate [Member] | The 2021 Warrants [Member]
Warrants assumptions	0.0131	0.0129
Measurement Input, Expected Dividend Rate [Member] | The 2019 Domestic Warrants [Member]
Warrants assumptions			0.0000
Measurement Input, Expected Dividend Rate [Member] | The 2019 Foreign Warrants [Member]
Warrants assumptions			0.0000
Measurement Input, Expected Dividend Rate [Member] | The 2019 Ladenburg Warrants [Member]
Warrants assumptions			0.0000
Measurement Input, Expected Dividend Rate [Member] | The 2021 Warrants [Member]
Warrants assumptions	0.0000	0.0000
Measurement Input, Share Price [Member] | The 2019 Domestic Warrants [Member]
Warrants assumptions			1.18
Measurement Input, Share Price [Member] | The 2019 Foreign Warrants [Member]
Warrants assumptions			1.54
Measurement Input, Share Price [Member] | The 2019 Ladenburg Warrants [Member]
Warrants assumptions			1.17

X

- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

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- Details

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