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Consolidated Statements of Comprehensive Income (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income $ 3,580,615 $ 859,649 $ 8,273,212
Unrealized loss on marketable securities (1,303) (1) (47,141)
Currency translation adjustment 562,568 (415,447) 260,256
Unrealized loss on interest rate swaps (31,244) (267,378) (242,880)
Other comprehensive income (loss), net of tax 530,021 (682,826) (29,765)
Total comprehensive income $ 4,110,636 $ 176,823 $ 8,243,447