Summary of Significant Accounting Policies (Details Textual) (USD $)	6 Months Ended								3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2013 Wood River Plant [Member]	Dec. 31, 2012 Wood River Plant [Member]	Jun. 30, 2013 Fairmont Plant [Member]	Dec. 31, 2012 Fairmont Plant [Member]	Jun. 30, 2013 Cargill [Member]	Jun. 30, 2012 Cargill [Member]	Jun. 30, 2013 Cargill [Member]	Jun. 30, 2012 Cargill [Member]	Dec. 31, 2012 Cargill [Member]	Jun. 30, 2013 Sales Revenue, Goods, Net [Member]	Jun. 30, 2012 Sales Revenue, Goods, Net [Member]	Jun. 30, 2013 Sales Revenue, Goods, Net [Member]	Jun. 30, 2012 Sales Revenue, Goods, Net [Member]	Jun. 30, 2013 Accounts Receivable [Member]	Jun. 30, 2012 Accounts Receivable [Member]
Cash and cash equivalents	$ 11,232,000	$ 9,323,000	$ 9,213,000	$ 15,139,000
Concentration Risk Percentage During Period														76.00%	76.00%	75.00%	77.00%	91.00%	81.00%
Accounts receivable	12,597,000	9,256,000							11,400,000		11,400,000		7,500,000
Cost of Purchased Oil and Gas									72,100,000	103,600,000	142,500,000	215,400,000
Accounts payable	7,499,000	11,638,000							3,600,000		3,600,000		9,000,000
Asset Retirement Obligation					152,000	149,000	191,000	188,000
Property, Plant and Equipment, Estimated Useful Lives	20 years
Longterm Debt Anticipated Interest Rate	12.00%
Long-term Debt, Fair Value	$ 155,300,000