Note 8 - Warrant Activity (Details) - Restricted Stock [Member] - $ / shares |
12 Months Ended | |
|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Beginning balance (in shares) | 252,620 | 255,671 |
| Beginning balance (in dollars per share) | $ 44.18 | $ 44.18 |
| Warrants granted (in shares) | 5,238,971 | |
| Warrants granted (in dollars per share) | $ 9.83 | |
| Warrants exercised (cashless) (in shares) | (51,712) | |
| Warrants exercised (cashless) (in dollars per share) | $ 13.60 | |
| Warrants expired/canceled (in shares) | (611,156) | (3,051) |
| Warrants expired/canceled (in dollars per share) | $ 17.21 | $ 43 |
| Outstanding at June 30 (in shares) | 4,828,723 | 252,620 |
| Outstanding at June 30 (in dollars per share) | $ 9.37 | $ 44.18 |
| Exercisable at June 30 (in shares) | 600,782 | 252,620 |
| Exercisable at June 30 (in dollars per share) | $ 19.02 | $ 44.18 |