Note 15 - Fair Value Measurement (Details) - Changes in Level 3 Liabilities Measured at Fair Value on Recurring Basis - USD ($) |
9 Months Ended | 12 Months Ended |
|---|---|---|
Sep. 30, 2015 |
Dec. 31, 2014 |
|
| Accrued and Other Long-term Liabilities [Member] | ||
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Balance | $ 129,598 | $ 177,927 |
| Issuances | 122,630 | |
| Total realized and unrealized gains or losses | (41,265) | (50,809) |
| Transfers out of level 3 upon exercise or conversion | (88,333) | (221,768) |
| Balance | 0 | 129,598 |
| Common Stock Warrant Liability [Member] | ||
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Balance | 129,598 | 177,927 |
| Issuances | 122,630 | |
| Total realized and unrealized gains or losses | (41,265) | (50,809) |
| Transfers out of level 3 upon exercise or conversion | (88,333) | (221,768) |
| Balance | $ 0 | $ 129,598 |