Note 8 - Derivative Obligations - Fair Value Assumptions (Details) - Series A Warrant [Member] - $ / shares	6 Months Ended	12 Months Ended
Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Market price of common stock (in dollars per share)	$ 3	$ 3.17	$ 2.93
Expected volatility	107.00%	110.00%	99.00%
Contractual term (years) (Year)	3 years 73 days	3 years 255 days	4 years 255 days
Discount rate	1.99%	1.66%	1.01%
Dividend rate	0.00%	0.00%	0.00%
Exercise price (in dollars per share)	$ 8	$ 8	$ 8

Agreed upon price for the exchange of the underlying asset.

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

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Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

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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.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Price of a single share of a number of saleable stocks of a company.

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No definition available.

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