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Condensed Consolidated Statements of Comprehensvie Income (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
NET INCOME $ 388,729 $ 4,417,241 $ 7,285,932 $ 21,544,549
Other comprehensive income (loss):        
Foreign currency translation 3,195 (15,586) (247) (10,356)
Unrealized gain (loss) on short term investments 79,313 (43,078) 175,201 (43,078)
COMPREHENSIVE INCOME $ 471,237 $ 4,358,577 $ 7,460,886 $ 21,491,115