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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 0.38 0.25  
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 0.849 0.87  
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 6.2 6.0  
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 0.0129 0.0131  
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