Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Stockholders' Equity - Assumption Used to Value Liability Classified Warrants at Grant Date (Details)

v3.19.2
Note 8 - Stockholders' Equity - Assumption Used to Value Liability Classified Warrants at Grant Date (Details)
Jun. 30, 2019
$ / shares
yr
Measurement Input, Expected Term [Member] | The 2016 Warrants [Member]  
Warrants, measurement input (Year) | yr 0.4
Measurement Input, Expected Term [Member] | The 2016 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year) | yr 0.4
Measurement Input, Expected Term [Member] | The 2019 Warrants [Member]  
Warrants, measurement input (Year) | yr 5
Measurement Input, Expected Term [Member] | The 2019 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year) | yr 4.6
Measurement Input, Price Volatility [Member] | The 2016 Warrants [Member]  
Warrants, measurement input (Year) 1
Measurement Input, Price Volatility [Member] | The 2016 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year) 1
Measurement Input, Price Volatility [Member] | The 2019 Warrants [Member]  
Warrants, measurement input (Year) 0.85
Measurement Input, Price Volatility [Member] | The 2019 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year) 0.84
Measurement Input, Expected Dividend Rate [Member] | The 2016 Warrants [Member]  
Warrants, measurement input (Year) 0
Measurement Input, Expected Dividend Rate [Member] | The 2016 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year) 0
Measurement Input, Expected Dividend Rate [Member] | The 2019 Warrants [Member]  
Warrants, measurement input (Year) 0
Measurement Input, Expected Dividend Rate [Member] | The 2019 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year) 0
Measurement Input, Exercise Price [Member] | The 2016 Warrants [Member]  
Warrants, measurement input (Year) 2.55
Measurement Input, Exercise Price [Member] | The 2016 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year) 2.55
Measurement Input, Exercise Price [Member] | The 2019 Warrants [Member]  
Warrants, measurement input (Year) 0.5
Measurement Input, Exercise Price [Member] | The 2019 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year) 0.5
Measurement Input, Risk Free Interest Rate [Member] | The 2016 Warrants [Member]  
Warrants, measurement input (Year) 0.0209
Measurement Input, Risk Free Interest Rate [Member] | The 2016 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year) 0.0209
Measurement Input, Risk Free Interest Rate [Member] | The 2019 Warrants [Member]  
Warrants, measurement input (Year) 0.025
Measurement Input, Risk Free Interest Rate [Member] | The 2019 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year) 0.0176
Measurement Input, Weighted Average of Shares Granted, Fair Value [Member] | The 2016 Warrants [Member]  
Warrants, measurement input (Year)
Measurement Input, Weighted Average of Shares Granted, Fair Value [Member] | The 2016 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year)
Measurement Input, Weighted Average of Shares Granted, Fair Value [Member] | The 2019 Warrants [Member]  
Warrants, measurement input (Year) 0.22
Measurement Input, Weighted Average of Shares Granted, Fair Value [Member] | The 2019 Warrants [Member] | Warrant Liabilities [Member]  
Warrants, measurement input (Year) 0.21