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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details Textual) | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2011 USD ($) | Sep. 30, 2008 USD ($) | Apr. 30, 2008 USD ($) | Jun. 30, 2012 USD ($) lb | Jun. 30, 2011 USD ($) | Dec. 31, 2011 USD ($) lb | Jun. 30, 2012 EUR (€)
Derivatives, Hedges, Financial Instruments and Carbon Credits (Textual) [Abstract] |  |  |  |  |  |  |
Interest rate contracts at cost basis |  | $ 400,000 |  |  |  |  |
Estimated market weighted-average exchange rate |  |  |  | 1.27 |  |  |
Contractual weighted average pay rate |  |  |  | 3.23% |  |  |
Estimated market weighted average receive rate |  |  |  | 0.71% |  |  |
Carbon credit fair value per unit |  |  |  | 3.15 |  | 3.15 |
Carbon credit lower range of ask or bid price |  |  |  | 1.00 |  | 1.00 |
Carbon credit higher range of ask or bid price |  |  |  | 4.00 |  | 3.00 |
Future or forward copper contract period |  |  |  | December, 2012 |  | May, 2012 |
Derivative future or forward contract in Pounds |  |  |  | 625,000 |  | 375,000 |
Weighted average cost per pound of future or forward copper contract |  |  |  | 3.83 |  | 3.42 |
Foreign Exchange Contract receipt |  |  |  |  |  |  | 344,000
The month foreign exchange contract receipt period ends |  |  |  | August 2012 |  |  |
Contractual weighted-average exchange rate (U.S. Dollar/ Euro) |  |  |  | 1.27 |  |  |
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 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 Average estimated market rate at which a foreign currency can be purchased or sold. + 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 This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date. + References No definition available. + Details
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