Note 11 - Stock Option Plan and Stock Incentive Plan (Details) - Summary of Restricted Stock Activity - Restricted Stock [Member] - $ / shares |
9 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Note 11 - Stock Option Plan and Stock Incentive Plan (Details) - Summary of Restricted Stock Activity [Line Items] | |||
| Outstanding and not vested, Number of Restricted Shares | 7,186 | 1,890,952 | 48,073 |
| Outstanding and not vested | $ 2.16 | $ 0.05 | $ 2.50 |
| Released/vested | (7,186) | (1,883,766) | (635,323) |
| Released/vested | $ 2.16 | $ 0.04 | $ 0.08 |
| Outstanding and not vested, Number of Restricted Shares | 0 | 7,186 | 1,890,952 |
| Outstanding and not vested | $ 0 | $ 2.16 | $ 0.05 |