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Note 9 - Warrant Derivative Liability - Assumptions to Estimate Fair Value of Warrants (Details) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2017 | May 31, 2016
Stock price (based on prices on valuation date) (in dollars per share) | $ 0.50 | $ 0.43 | $ 0.40
Exercise price (in dollars per share) | $ 1.55 |  |
Expected volatility | 110.00% |  |
Minimum [Member] |  |  |
Risk-free interest rate | 0.44% |  |
Expected life (average) (Year) | 350 days |  |
Maximum [Member] |  |  |
Risk-free interest rate | 0.49% |  |
Expected life (average) (Year) | 1 year 120 days |  |

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- Definition Agreed upon price for the exchange of the underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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