Derivatives, Hedges, Financial Instruments and Carbon Credits (Details Textual) (USD $)	1 Months Ended			9 Months Ended		12 Months Ended
	Feb. 28, 2011	Sep. 30, 2008	Apr. 30, 2008	Sep. 30, 2012 lb	Sep. 30, 2011	Dec. 31, 2011 lb
Derivatives, Hedges, Financial Instruments and Carbon Credits (Textual) [Abstract]
Interest rate contracts at cost basis		$ 400,000
Contractual weighted average pay rate				3.23%
Estimated market weighted average receive rate				0.48%
Carbon credit fair value per unit				0.50		3.15
Carbon credit lower range of ask or bid price				0.50		1.00
Carbon credit higher range of ask or bid price				3.00		3.00
Future or forward copper contract period				May, 2013		May,2012
Derivative future or forward contract in Pounds				625,000		375,000
Weighted average cost per pound of future or forward copper contract				3.63		3.42
Interest rate contracts fixed rate description	fixed three-month LIBOR rate of 3.23% on a declining balance	LIBOR rate of 3.595% on $25 million	Fixed three-month LIBOR rate of 3.24% on $25 million
Interest rate contracts LIBOR rate		3.595%	3.24%
Notional amount of Interest rate contracts		25,000,000	25,000,000
LIBOR rate	3.23%
Interest rate swap declining balance beginning balance	23,800,000
Interest rate swap declining balance ending balance	18,800,000
Maturity period interest rate contract held	March, 2016	April, 2012	April, 2012
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications