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Discontinued Operations - Disposal of Ethanol Plants (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Operating Leases, Rent Expense | $ 42,000 | $ 68,000 | $ 88,000 | $ 131,000
Ethanol Plants [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Depreciation |  | 6,832,000 |  | 13,699,000
Operating Leases, Rent Expense |  | 2,821,000 |  | 5,619,000
Sales Revenue, Goods, Net [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Concentration Risk Percentage During Period |  | 76.00% |  | 75.00%
Cargill [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Cost of Purchased Oil and Gas |  | $ 72,100,000 |  | $ 142,500,000

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