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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