Quarterly Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Data [Abstract]
Revenues	$ 1,124	$ 4,342	$ 10,810	$ 1,250	$ 1,001	$ 1,176	$ 1,188	$ 849	$ 17,526	$ 4,214	$ 8,410
Operating income (loss)	(797)	2,037	8,763	(786)	(796)	(452)	(214)	(1,587)	9,217	(3,049)	(2,252)
Loss from Dynamic Fuels investment	(4,275)	(2,752)	(2,155)	(830)	(1,594)	(5,348)	(4,829)	(2,109)	(10,012)	(13,880)	(5,628)
Net income (loss) from continuing operations	(5,059)	(1,037)	6,956	(1,923)	(2,957)	(4,588)	(5,469)	(3,908)	(1,063)	(16,922)	(9,633)
Net income (loss) from discontinued operations	(10)	(9)	(9)	(10)	(10)	(9)	(9)	1	(38)	(27)	97
Net income (loss)	$ (5,069)	$ (1,046)	$ 6,947	$ (1,933)	$ (2,967)	$ (4,597)	$ (5,478)	$ (3,907)	$ (1,101)	$ (16,949)	$ (9,536)
Basic and diluted EPS, Continuing operations	$ (0.05)	$ (0.01)	$ 0.07	$ (0.02)	$ (0.03)	$ (0.05)	$ (0.07)	$ (0.05)	$ (0.01)	$ (0.19)	$ (0.12)
Basic and diluted EPS, Discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Basic and diluted EPS, Net income (loss)	$ (0.05)	$ (0.01)	$ 0.07	$ (0.02)	$ (0.03)	$ (0.05)	$ (0.07)	$ (0.05)	$ (0.01)	$ (0.19)	$ (0.12)