Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Blenders' tax credit | $ 11,409,000 | $ 30,895,000 |
| Allowance for bad debt | $ 0 | $ 0 |
| Preferred stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001 |
| Preferred stock, shares authorized (in shares) | 5,000,000 | 5,000,000 |
| Preferred stock, shares issued (in shares) | 0 | 0 |
| Preferred stock, shares outstanding (in shares) | 0 | 0 |
| Common stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001 |
| Common stock, shares authorized (in shares) | 75,000,000 | 75,000,000 |
| Common stock, shares issued (in shares) | 43,721,376 | 43,715,832 |
| Common stock, shares outstanding (in shares) | 43,721,376 | 43,715,832 |