XML 66 R49.htm IDEA: XBRL DOCUMENT v2.4.0.6
Derivatives, Hedges, Financial Instruments and Carbon Credits (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2011
Sep. 30, 2008
Apr. 30, 2008
Mar. 31, 2012
lb
Mar. 31, 2011
Dec. 31, 2011
lb
Derivatives, Hedges, Financial Instruments and Carbon Credits (Textual) [Abstract]            
Contractual weighted average pay rate       3.25%    
Estimated market weighted average receive rate       0.93%    
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       3.50   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       3.59   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      
Maturity period interest rate contract held   April, 2012 April, 2012      
LIBOR rate 3.23%          
Libor declaining balance 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              
Interest Rate Swap [Member]
            
Derivative Financial Instruments and Carbon Credit Gain Loss [Line Items]            
Interest rate contracts at cost basis   $ 400,000