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Income Tax (Details Textual) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
Income Tax (Details Textual) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income tax (Textual)
Income tax expense	$ 313,502	$ 106,953	$ 430,198	$ 320,308
Statutory income tax rate	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%
Effective tax rate, reduced	15.00%	12.50%	15.00%	12.50%	12.50%	12.50%	12.50%
Income tax payable	$ 1,476,642		$ 1,476,642		$ 1,216,841

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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