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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
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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 |

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- 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=117815213&loc=d3e19207-110258 + Details
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