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Note 7 - Warrant Activity (Details) - $ / shares | 12 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
Minimum [Member] |  |  |
Shares purchasable under outstanding warrants, remaining contractual term | 346 days | 1 year 193 days | 1 year 346 days
Stock purchase warrants issued |  | 1 year 193 days |
Maximum [Member] |  |  |
Shares purchasable under outstanding warrants, remaining contractual term | 3 years 273 days | 3 years 255 days | 3 years 255 days
Stock purchase warrants issued |  | 2 years 197 days |
Shares purchaseable under outstanding warrants, number of shares (in shares) | 28,040,096 | 22,798,347 |
Shares purchasable under outstanding warrants, weighted average exercise price (in dollars per share) | $ 0.21 | $ 1.21 |
Stock purchase warrants issued (in shares) |  | 5,241,749 |
Stock purchase warrants issued (in dollars per share) |  | $ 0.22 |
Stock purchase warrants exercised (in shares) |  |  |
Stock purchase warrants exercised (in dollars per share) |  |  |
Shares purchasable under outstanding warrants, number of shares (in shares) |  | 28,040,096 | 22,798,347
Shares purchasable under outstanding warrants, weighted average exercise price (in dollars per share) | $ 0.21 | $ 0.21 | $ 1.21

X
- Definition Class of Warrant or Right, Exercised in Period + References No definition available. + Details
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Balance Type: | na
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X
- Definition Class of Warrant or Right Exercises In Period, Weighted Average Exercise Price of Warrants or Rights + References No definition available. + Details
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X
- Definition Class of Warrant or Right Issued In Period, Weighted Average Exercise Price of Warrants or Rights + References No definition available. + Details
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X
- Definition Represents the weighted average exercise price of warrants or rights. + References No definition available. + Details
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X
- Definition The remaining contractual term of each class of warrants or rights outstanding. + References No definition available. + Details
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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