Note 5 - Stockholders' Deficit - Warrant Activity (Details) - $ / shares |
3 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2017 |
Jun. 30, 2016 |
|
| Shares purchasable under outstanding warrants (in shares) | 2,342,590 | |
| Shares purchasable under outstanding warrants, weighted average exercise price (in dollars per share) | $ 1.97 | |
| Shares purchasable under outstanding warrants, remaining contractual term (Year) | 1 year 120 days | |
| Stock purchase warrants expired (in shares) | (98,482) | |
| Stock purchase warrants expired, weighted average exercise price (in dollars per share) | $ 2.28 | |
| Shares purchasable under outstanding warrants (in shares) | 2,244,108 | |
| Shares purchasable under outstanding warrants, weighted average exercise price (in dollars per share) | $ 1.95 | |
| Minimum [Member] | ||
| Shares purchasable under outstanding warrants, remaining contractual term (Year) | 43 days | |
| Maximum [Member] | ||
| Shares purchasable under outstanding warrants, remaining contractual term (Year) | 1 year 200 days |