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Note 8 - Stockholders' Equity - Assumptions Used to Value Warrants at Grant Date (Details)	Sep. 30, 2019
Measurement Input, Share Price [Member] | The 2019 Warrants [Member]
Warrants, measurement input	0.33
Measurement Input, Share Price [Member] | Minimum [Member] | The 2016 Warrants [Member]
Warrants, measurement input	0.36
Measurement Input, Share Price [Member] | Maximum [Member] | The 2016 Warrants [Member]
Warrants, measurement input	0.83
Measurement Input, Expected Term [Member] | The 2019 Warrants [Member]
Warrants, measurement input	4.9
Measurement Input, Expected Term [Member] | Minimum [Member] | The 2016 Warrants [Member]
Warrants, measurement input	0.2
Measurement Input, Expected Term [Member] | Maximum [Member] | The 2016 Warrants [Member]
Warrants, measurement input	0.5
Measurement Input, Price Volatility [Member] | The 2019 Warrants [Member]
Warrants, measurement input	0.83
Measurement Input, Price Volatility [Member] | Minimum [Member] | The 2016 Warrants [Member]
Warrants, measurement input	0.86
Measurement Input, Price Volatility [Member] | Maximum [Member] | The 2016 Warrants [Member]
Warrants, measurement input	1
Measurement Input, Expected Dividend Rate [Member] | The 2016 Warrants [Member]
Warrants, measurement input	0
Measurement Input, Expected Dividend Rate [Member] | The 2019 Warrants [Member]
Warrants, measurement input	0
Measurement Input, Exercise Price [Member] | The 2016 Warrants [Member]
Warrants, measurement input	2.55
Measurement Input, Exercise Price [Member] | The 2019 Warrants [Member]
Warrants, measurement input	0.5
Measurement Input, Risk Free Interest Rate [Member] | The 2019 Warrants [Member]
Warrants, measurement input	0.023
Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member] | The 2016 Warrants [Member]
Warrants, measurement input	0.0188
Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member] | The 2016 Warrants [Member]
Warrants, measurement input	0.0209
Measurement Input, Weighted Average of Shares Granted, Fair Value [Member] | The 2019 Warrants [Member]
Warrants, measurement input	0.19
Measurement Input, Number of Shares Granted [Member] | The 2016 Warrants [Member]
Warrants, measurement input	1,512,067
Measurement Input, Number of Shares Granted [Member] | The 2019 Warrants [Member]
Warrants, measurement input	1,749,171

X

- 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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Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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X

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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