Long-Term Debt (Details Textual) (USD $)	12 Months Ended			12 Months Ended	1 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Feb. 28, 2007	Dec. 31, 2012 City Wood River Facility [Member]	Oct. 31, 2012 Senior Debt Facility [Member]	Dec. 31, 2012 Senior Debt Facility [Member]	Sep. 28, 2012 Senior Debt Facility [Member]	Dec. 31, 2011 Senior Debt Facility [Member]	Mar. 31, 2008 Capital Lease Obligations [Member]	Dec. 31, 2012 Capital Lease Obligations [Member]
Debt Instrument, Periodic Payment	$ 9,000			$ 58,000		$ 3,150,000
Long-term Debt, Gross						170,500,000
Debt Instrument, Description of Variable Rate Basis						Interest rates on the Senior Debt Facility are, at management''s option, set at: i) a base rate, which is the higher of the federal funds rate plus 0.5% or the administrative agent''s prime rate, in each case plus a margin of 2.0%; or ii) at LIBOR plus 3.0%.
Debt Instrument, Interest Rate, Effective Percentage						3.20%		3.30%
Management Fee Monthly						884,000
Debt Issuance Costs						7,900,000
Debt issuance costs, net	1,739,000	2,763,000				1,700,000
Percentage Of Accrued Interest Penalty Rate						8.30%
Fixed Facilities Charges Monthly Based On Cost Of Substation and Distribution Facility										34,000
Minimum Energy Charge									25,000
Proceeds from Notes Payable				419,000
Long-Term Debt	173,429,000	179,647,000				8,200,000	3,600,000
Debt Instrument, Interest Rate, Stated Percentage			7.85%	6.50%
Debt Instrument Of First Required Payment1	208,000
Debt Instrument, Interest Rate During Period	6.00%
Debt Instrument, Maturity Date, Description	2014			2018
Debt Instrument, Maturity Date						Sep. 30, 2014
Term Of Capital Lease										30 years
Management Fee, Amount Paid					$ 260,000