Consolidated Balance Sheets (Parentheticals) - $ / shares |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Stockholders' Equity Attributable to Parent [Abstract] | ||
| Preferred stock, par or stated value (usd per share) | $ 0.001 | $ 0.001 |
| Preferred stock shares authorized, shares | 50,000,000 | 50,000,000 |
| Preferred stock shares issued, shares | 0 | 0 |
| Common stock, par or stated value (usd per share) | $ 0.001 | $ 0.001 |
| Common stock shares authorized, shares | 900,000,000 | 900,000,000 |
| Common stock shares outstanding, shares | 343,575,840 | 337,065,419 |