Investment In And Loans To Dynamic Fuels, LLC (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2012 gal lb	Jun. 30, 2012	Sep. 30, 2012 gal	Jun. 30, 2012 gal	Sep. 30, 2011	Jun. 30, 2011 gal	Dec. 31, 2011
Unusual Risk or Uncertainty [Line Items]
Increase of price per pound of feedstock	0.01
Feedstock available for purchase under the agreement	1,100,000,000
Additional investment to settle obligations of related party			$ 6,597,000
Revenue recognized		3,701,000
Fair value of vested warrants recognized in revenues		166,000
Unpaid invoices			13,000
Total estimate of maximum exposure to loss	42,919,000		42,919,000
Equity investment in and loans to Dynamic Fuels, LLC	42,682,000		42,682,000				38,643,000
Accounts receivable from Dynamic Fuels, LLC	237,000		237,000
Renewable products sold	63,000,000		63,000,000
Plant design production rate per year			75,000,000
Plant production as a percentage of design capacity	56.00%			47.00%		25.00%
Plant production per period	10,600,000			26,500,000		14,000,000
Technical services and royalty revenue			5,482,000		1,449,000
Receivable from Dynamic Fuels							2,624,000
Period plant ran at full rates	51 days
Tyson Foods, Inc [Member]
Unusual Risk or Uncertainty [Line Items]
Unpaid invoices			$ 1,200,000
Hurricane Isaac [Member]
Unusual Risk or Uncertainty [Line Items]
Period plant was down	5 days
Shutdown To Start Up Transition [Member]
Unusual Risk or Uncertainty [Line Items]
Period plant was down	16 days
Various Mechanical Issues [Member]
Unusual Risk or Uncertainty [Line Items]
Period plant was down	20 days