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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details Textual) (USD $) | 1 Months Ended | 9 Months Ended | 12 Months Ended
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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 |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The fair value per carbon credit unit as of the balance sheet date. + References No definition available. + Details
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- Definition Contractual weighted average pay rate related to the entity's interest rate contracts as of the balance sheet date. + References No definition available. + Details
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- Definition Derivative future or forward contract in pounds. + References No definition available. + Details
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- Details
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- Definition Estimated market weighted average receive rate related to the entity's interest rate contracts as of the balance sheet date. + References No definition available. + Details
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- Definition Fair value measurement with inputs reconciliation recurring basis asset transfers in out of level one and level two. + References No definition available. + Details
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- Definition Future or forward copper contract period. + References No definition available. + Details
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- Definition Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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