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Derivatives, Hedges, Financial Instruments and Carbon Credits (Details Textual)
 1 Months Ended 12 Months Ended 12 Months Ended
Feb. 28, 2011
USD ($)
Sep. 30, 2008
USD ($)
Apr. 30, 2008
USD ($)
Dec. 31, 2011
USD ($)
lb
MMBTU
Dec. 31, 2010
USD ($)
lb
MMBTU
Dec. 30, 1999
Dec. 31, 2011
EUR (€)
Dec. 31, 2010
EUR (€)
Dec. 31, 2009
USD ($)
Dec. 31, 1999
USD ($)
Dec. 31, 2011
Secured Term Loan due 2012 [Member]
USD ($)
Dec. 31, 2010
Other debt [Member]
Dec. 31, 2008
Interest Rate Swap [Member]
USD ($)
Dec. 31, 2010
Carbon Credits [Member]
t
Derivative Financial Instruments and Carbon Credit Gain Loss [Line Items]                            
Interest rate contracts at cost basis                         $ 400,000  
Carbon credits subject to contractual obligations                           198,000
Debt instrument, interest rate                     5.15% 6.00%    
Debt instrument principal amount                     24,100,000      
Variable interest rate, Minimum                       6.00%    
Derivatives, Hedges, Financial Instruments and Carbon Credits (Textual) [Abstract]                            
Foreign exchange contracts Weighted average exchange rate       0.00 1.26                  
Contractual weighted average pay rate       3.27%                    
Estimated market weighted average receive rate       0.99%                    
Carbon credit fair value per unit       3.15 3.25                  
Carbon credit lower range of ask or bid price       1.00 3.00                  
Carbon credit higher range of ask or bid price       3.00 5.00                  
Future or forward copper contract period       May 2012 May 2011                  
Derivative future or forward contract in Pounds       375,000 750,000                  
Weighted average cost per pound of future or forward copper contract       3.42 3.75                  
Weighted average cost per MMBtu of future or forward natural gas contracts       0 4.10                  
Derivative future or forward gas contract in MMBtu       0 800,000                  
Foreign Exchange contract payment             0 783,000            
Foreign Exchange contracts receipt       0       110,000            
The month foreign exchange contract receipt period ends         June 2011                  
The month foreign exchange contract payment period ends         March 2011                  
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                      
Maturity period interest rate contract held       April, 2012                    
Basis for estimated fair value of secured term loan         LIBOR rates plus 6%                  
Initial lease term of long-term lease agreement           10 years                
Termination cost of forward agreement                   2,800,000        
Amortization of a cash flow hedge       0 0       120,000          
Interest rate swap 0                          
LIBOR rate 3.23%                          
Notional Amount of Interest Rate Derivatives 23,800,000                          
Interest rate swap declining balance ending balance 18,800,000                          
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications       $ 0                    
The month future or forward natural gas contract period ends         February 2011