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Note 8 - Stockholders' Equity - Assumption Used to Value Liability Classified Warrants at Grant Date (Details) | Jun. 30, 2019 $ / shares yr
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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

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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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