| Schedule of Financial Date for Operating Segments | 
    |   | 
  | 
    Three Months Ended
      June 30, | 
  | 
  | 
    Six Months Ended  
    June 30, | 
  | 
 
    |   | 
  | 
    2016 | 
  | 
  | 
    2015 | 
  | 
  | 
    2016 | 
  | 
  | 
    2015 | 
  | 
 
    |   | 
  | 
      | 
  | 
  | 
      | 
  | 
  | 
      | 
  | 
  | 
      | 
  | 
 
    | Net Sales | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
    | Ethanol Production: | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
    | Net sales to external customers | 
  | 
    $ | 
271,630 | 
  | 
  | 
    $ | 
108,960 | 
  | 
  | 
    $ | 
500,871 | 
  | 
  | 
    $ | 
207,957 | 
  | 
 
    | Intersegment net sales | 
  | 
      | 
260 | 
  | 
  | 
      | 
85 | 
  | 
  | 
      | 
523 | 
  | 
  | 
      | 
85 | 
  | 
 
    | Total production segment sales | 
  | 
      | 
271,890 | 
  | 
  | 
      | 
109,045 | 
  | 
  | 
      | 
501,394 | 
  | 
  | 
      | 
208,042 | 
  | 
 
    |   | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
    | Marketing and distribution: | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
    | Net sales to external customers | 
  | 
      | 
151,230 | 
  | 
  | 
      | 
118,661 | 
  | 
  | 
      | 
264,362 | 
  | 
  | 
      | 
225,840 | 
  | 
 
    | Intersegment net sales | 
  | 
      | 
2,091 | 
  | 
  | 
      | 
836 | 
  | 
  | 
      | 
3,843 | 
  | 
  | 
      | 
1,571 | 
  | 
 
    | Total marketing and distribution net sales | 
  | 
      | 
153,321 | 
  | 
  | 
      | 
119,497 | 
  | 
  | 
      | 
268,205 | 
  | 
  | 
      | 
227,411 | 
  | 
 
    | Intersegment eliminations | 
  | 
      | 
(2,351 | 
) | 
  | 
      | 
(921 | 
) | 
  | 
      | 
(4,366 | 
) | 
  | 
      | 
(1,656 | 
) | 
 
    | Net sales as reported | 
  | 
    $ | 
422,860 | 
  | 
  | 
    $ | 
227,621 | 
  | 
  | 
    $ | 
765,233 | 
  | 
  | 
    $ | 
433,797 | 
  | 
 
    |   | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
    | Cost of goods sold: | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
    | Ethanol production | 
  | 
    $ | 
260,237 | 
  | 
  | 
    $ | 
105,623 | 
  | 
  | 
    $ | 
496,246 | 
  | 
  | 
    $ | 
207,160 | 
  | 
 
    | Marketing and distribution | 
  | 
      | 
149,521 | 
  | 
  | 
      | 
118,522 | 
  | 
  | 
      | 
258,819 | 
  | 
  | 
      | 
226,581 | 
  | 
 
    | Intersegment eliminations | 
  | 
      | 
(4,602 | 
) | 
  | 
      | 
(2,778 | 
) | 
  | 
      | 
(8,605 | 
) | 
  | 
      | 
(5,211 | 
) | 
 
    | Cost of goods sold as reported | 
  | 
    $ | 
405,156 | 
  | 
  | 
    $ | 
221,367 | 
  | 
  | 
    $ | 
746,460 | 
  | 
  | 
    $ | 
428,530 | 
  | 
 
    |   | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
    | Income (loss) before provision for income taxes: | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
    | Ethanol production | 
  | 
    $ | 
794 | 
  | 
  | 
    $ | 
1,013 | 
  | 
  | 
    $ | 
(16,330 | 
) | 
  | 
    $ | 
(4,199 | 
) | 
 
    | Marketing and distribution | 
  | 
      | 
2,209 | 
  | 
  | 
      | 
(516 | 
) | 
  | 
      | 
6,178 | 
  | 
  | 
      | 
(2,131 | 
) | 
 
    | Corporate activities | 
  | 
      | 
1,838 | 
  | 
  | 
      | 
1,085 | 
  | 
  | 
      | 
1,767 | 
  | 
  | 
      | 
703 | 
  | 
 
    |   | 
  | 
    $ | 
4,841 | 
  | 
  | 
    $ | 
1,582 | 
  | 
  | 
    $ | 
(8,385 | 
) | 
  | 
    $ | 
(5,627 | 
) | 
 
    | Depreciation and amortization: | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
    | Ethanol production | 
  | 
    $ | 
8,793 | 
  | 
  | 
    $ | 
3,206 | 
  | 
  | 
    $ | 
17,209 | 
  | 
  | 
    $ | 
6,390 | 
  | 
 
    | Marketing and distribution | 
  | 
      | 
 | 
  | 
  | 
      | 
15 | 
  | 
  | 
      | 
3 | 
  | 
  | 
      | 
142 | 
  | 
 
    | Corporate activities | 
  | 
      | 
225 | 
  | 
  | 
      | 
119 | 
  | 
  | 
      | 
458 | 
  | 
  | 
      | 
216 | 
  | 
 
    |   | 
  | 
    $ | 
9,018 | 
  | 
  | 
    $ | 
3,340 | 
  | 
  | 
    $ | 
17,670 | 
  | 
  | 
    $ | 
6,748 | 
  | 
 
    | Interest expense: | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
  | 
      | 
  | 
  | 
 
    | Ethanol production | 
  | 
    $ | 
6,180 | 
  | 
  | 
    $ | 
922 | 
  | 
  | 
    $ | 
12,080 | 
  | 
  | 
    $ | 
1,844 | 
  | 
 
    | Marketing and distribution | 
  | 
      | 
356 | 
  | 
  | 
      | 
83 | 
  | 
  | 
      | 
689 | 
  | 
  | 
      | 
176 | 
  | 
 
    | Corporate activities | 
  | 
      | 
 | 
  | 
  | 
      | 
 | 
  | 
  | 
      | 
 | 
  | 
  | 
      | 
 | 
  | 
 
    |   | 
  | 
    $ | 
6,536 | 
  | 
  | 
    $ | 
1,005 | 
  | 
  | 
    $ | 
12,769 | 
  | 
  | 
    $ | 
2,020 | 
  | 
 
 
 |