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Note 9 - Stockholders' Equity - Inputs Used in Valuation of Warrants (Details) | Jun. 30, 2017 | Apr. 03, 2017
--- | --- | ---
Measurement Input, Share Price [Member] |  |
Inputs | 6 | 9
Measurement Input, Exercise Price [Member] |  |
Inputs | 3.12 | 11.25
Measurement Input, Price Volatility [Member] |  |
Inputs | 0.5 | 0.5
Measurement Input, Expected Dividend Rate [Member] |  |
Inputs | 0 | 0
Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member] |  |
Inputs | 0.0079 | 0.0079
Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member] |  |
Inputs | 0.0188 | 0.0188
Measurement Input, Expected Term [Member] | Minimum [Member] |  |
Inputs | 0.08 | 0.24
Measurement Input, Expected Term [Member] | Maximum [Member] |  |
Inputs | 4.76 | 5

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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=99377789&loc=d3e19207-110258 + Details
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