Consolidated Balance Sheets (Parentheticals) - $ / shares |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Preferred stock, shares authorized (in shares) | 10,000,000 | 10,000,000 |
| Preferred stock, shares issued (in shares) | 0 | 0 |
| Preferred stock, shares outstanding (in shares) | 0 | 0 |
| Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Common stock, shares authorized (in shares) | 1,100,000,000 | 1,100,000,000 |
| Common stock, shares issued (in shares) | 886,090,164 | 477,149,485 |
| Common stock, shares outstanding (in shares) | 886,090,164 | 477,149,485 |