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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”). |  |  |  |

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- Definition Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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