Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Jan. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Accounting Policies [Line Items]
Reverse stock split ratio		0.01
Accounts receivable, payment period		30 days
Allowance for uncollectible accounts		$ 0	$ 0
Accretion expense		0	0
Intangible asset amortization expense		145	141	137
Estimated future amortization expense per year		145
Stock-based compensation. vesting period		3 years
Employer match of employee contributions, percent		50.00%
Defined contribution plan, recorded expense		125	129	137
Defined contribution plan, shares issued	10,197	27,498	19,942	12,120
Accumulated deficit		$ (362,717)	$ (360,464)
Dynamic Fuels, LLC [Member]
Significant Accounting Policies [Line Items]
Equity interest, percent owned		50.00%
Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life, property and equipment		3 years
Useful life, intangible assets		15 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life, property and equipment		7 years
Useful life, intangible assets		17 years