Investment In And Loans To Dynamic Fuels (Narrative) (Details) (USD $)	1 Months Ended		0 Months Ended	12 Months Ended						78 Months Ended	12 Months Ended	34 Months Ended		0 Months Ended	12 Months Ended		78 Months Ended
	Jun. 28, 2013	Jun. 27, 2012 lb	Jul. 13, 2007	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2013	Dec. 31, 2013 Geismar Facility [Member] gal	Sep. 30, 2013 Geismar Facility [Member] gal	Dec. 31, 2013 Dynamic Fuels, LLC [Member]	Jul. 13, 2007 Tyson Foods, Inc [Member]	Dec. 31, 2013 Tyson Foods, Inc [Member]	Dec. 31, 2012 Tyson Foods, Inc [Member]	Dec. 31, 2013 Tyson Foods, Inc [Member]
Unusual Risk or Uncertainty [Line Items]
Current accounts receivable from Dynamic Fuels, LLC						$ 252,000
Royalties from Dynamic Fuels, LLC plant production						789,000		921,000
Equity interest, percent owned													50.00%
Total estimate of maximum exposure to loss				37,850,000						37,850,000
Excess value of investment in Dynamic Fuels, LLC				7,600,000						7,600,000
Capital contribution to joint venture			4,250,000	3,450,000		39,250,000				53,560,000				4,250,000	3,450,000	41,250,000	56,740,000
Working capital loan				7,540,000		14,000,000				7,540,000					7,540,000	14,000,000	7,540,000
Renewable fuels, production volume												66,800,000
Plant design production rate per year											75,000,000
Additional equity contribution to joint venture		6,597,000
Increase of price per pound of feedstock		0.01
Feedstock available for purchase under agreement		1,100,000,000
Tax credit per gallon of produced renewable diesel				1.00
Tax credit per gallon of produced alternative fuels				0.50
Tax refund, receivable				988,000						988,000			23,000,000
Tax refund, receivable from IRS						10,000,000										10,000,000
Income taxes receivable per gallon				0.50
Income tax refunds received				9,000,000
Noncurrent receivable from Dynamic Fuels				11,600,000						11,600,000					11,600,000		11,600,000
HI Catalyst cost	7,300,000
Technical services revenue from Dynamic Fuels, LLC				469,000	469,000	5,228,000	6,017,000	974,000	1,895,000
Revenue recognized						$ 3,700,000