Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Stockholders' Equity - Assumptions Used to Value Warrants at Grant Date (Details)

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Note 9 - Stockholders' Equity - Assumptions Used to Value Warrants at Grant Date (Details)
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2016
Measurement Input, Share Price [Member] | The 2016 Warrants [Member]      
Warrants, measurement input   0.83  
Measurement Input, Share Price [Member] | The 2016 Warrants [Member] | Minimum [Member]      
Warrants, measurement input     0.36
Measurement Input, Share Price [Member] | The 2016 Warrants [Member] | Maximum [Member]      
Warrants, measurement input     0.83
Measurement Input, Share Price [Member] | The 2019 Warrants [Member]      
Warrants, measurement input 0.33 0.08  
Measurement Input, Expected Term [Member] | The 2016 Warrants [Member]      
Warrants, measurement input   0.02  
Measurement Input, Expected Term [Member] | The 2016 Warrants [Member] | Minimum [Member]      
Warrants, measurement input     0.25
Measurement Input, Expected Term [Member] | The 2016 Warrants [Member] | Maximum [Member]      
Warrants, measurement input     0.5
Measurement Input, Expected Term [Member] | The 2019 Warrants [Member]      
Warrants, measurement input 4.9 4.4  
Measurement Input, Price Volatility [Member] | The 2016 Warrants [Member]      
Warrants, measurement input   0.86  
Measurement Input, Price Volatility [Member] | The 2016 Warrants [Member] | Minimum [Member]      
Warrants, measurement input     0.86
Measurement Input, Price Volatility [Member] | The 2016 Warrants [Member] | Maximum [Member]      
Warrants, measurement input     1
Measurement Input, Price Volatility [Member] | The 2019 Warrants [Member]      
Warrants, measurement input 0.83 0.86  
Measurement Input, Expected Dividend Rate [Member] | The 2016 Warrants [Member]      
Warrants, measurement input   0 0
Measurement Input, Expected Dividend Rate [Member] | The 2019 Warrants [Member]      
Warrants, measurement input 0 0  
Measurement Input, Exercise Price [Member] | The 2016 Warrants [Member]      
Warrants, measurement input   2.55 2.55
Measurement Input, Exercise Price [Member] | The 2019 Warrants [Member]      
Warrants, measurement input 0.5 0.5  
Measurement Input, Risk Free Interest Rate [Member] | The 2016 Warrants [Member]      
Warrants, measurement input   0.0188  
Measurement Input, Risk Free Interest Rate [Member] | The 2016 Warrants [Member] | Minimum [Member]      
Warrants, measurement input     0.0188
Measurement Input, Risk Free Interest Rate [Member] | The 2016 Warrants [Member] | Maximum [Member]      
Warrants, measurement input     0.0209
Measurement Input, Risk Free Interest Rate [Member] | The 2019 Warrants [Member]      
Warrants, measurement input 0.023 0.0155  
Measurement Input, Weighted Average of Shares Granted, Fair Value [Member] | The 2016 Warrants [Member]      
Warrants, measurement input  
Measurement Input, Weighted Average of Shares Granted, Fair Value [Member] | The 2019 Warrants [Member]      
Warrants, measurement input 0.19 0.61  
Measurement Input, Number of Shares Granted [Member] | The 2016 Warrants [Member]      
Warrants, measurement input   1,512,067 1,512,067
Measurement Input, Number of Shares Granted [Member] | The 2019 Warrants [Member]      
Warrants, measurement input 1,749,171 1,691,421