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Long Term Retention Plan (Details Textual) (USD $)
 3 Months Ended
Mar. 31, 2012
Quotas
Mar. 31, 2011
Mar. 31, 2010
Mar. 31, 2009
Aug. 08, 2008
Long Term Retention Plan (Textual) [Abstract]          
Employee retention program payable in cash         50.00%
Employee retention program payable in shares         50.00%
Number of quotas for payment under LTRP 8        
Percentage quotas in each installment under LTRP 12.50%        
Percentage base for calculation of quotas under LTRP 6.25%        
Number of trading days consider for average closing Price 60 days        
Average closing stock price   $ 65.41 $ 45.75 $ 13.81  
Long Term Retention Plan 2008 [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grant-date fair market value of number of shares granted, per share 36.8        
Percentage of payment of long term retention plan 100.00%        
Related Accrued Compensation Expense 20,595 $ 69,818      
Share portion of award credited to additional paid-in capital 11,036 33,710      
Accrued compensation expense included in social security payable 9,559 $ 36,108      
Long Term Retention Plan 2009 [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Long Term Retention Plan Payment term     in 8 equal annual quotas (12.5% each) commencing on March 31, 2010    
Long Term Retention Plan Each quota calculation term     6.25% of the amount will be calculated in nominal terms (“the nominal basis share”), 6.25% will be adjusted by multiplying the nominal amount by the average closing stock price for the last 60 trading days of the year previous to the payment date and divided by the average closing stock price for the last 60 trading days of 2009 which is $13.81 (“the variable share”).    
Long Term Retention Plan 2010 [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Long Term Retention Plan Payment term   in 8 equal annual quotas (12.5% each) commencing on March 31, 2011      
Long Term Retention Plan Each quota calculation term   6.25% of the amount will be calculated in nominal terms (“the nominal basis share”), 6.25% will be adjusted by multiplying the nominal amount by the average closing stock price for the last 60 trading days of the year previous to the payment date and divided by the average closing stock price for the last 60 trading days of 2010 which is $45.75 (“the variable share”).      
Long Term Retention Plan 2011 [Member]
          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Long Term Retention Plan Payment term in 8 equal annual quotas (12.5% each) commencing on March 31, 2012        
Long Term Retention Plan Each quota calculation term 6.25% of the amount will be calculated in nominal terms (“the nominal basis share”), 6.25% will be adjusted by multiplying the nominal amount by the average closing stock price for the last 60 trading days of the year previous to the payment date and divided by the average closing stock price for the last 60 trading days of 2011 which is $65.41 (“the variable share”).