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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Balance at Dec. 31, 2009 $ 87,872,949 $ 42,308 $ 20,325,157 $ 61,602,677 $ 5,902,807
Balance, shares at Dec. 31, 2009 42,308,350 42,308,350      
Exercise of warrants for cash 2,583,000 1,086 2,581,914      
Exercise of warrants for cash, shares   1,085,292      
Issuance of stock as compensation 21,000 7 20,993      
Issuance of stock as compensation, shares   6,863      
Exercise of stock options, net of 35,948 shares received as payment of exercise price   4 (4)      
Exercise of stock options, net of 35,948 shares received as payment of exercise price, shares   4,052      
Stock-based compensation from stock options 207,423    207,423      
Issuance of warrants as compensation 116,993    116,993      
Net income for the year 23,414,347       23,414,347   
Foreign currency translation adjustment 3,721,462          3,721,462
Balance at Dec. 31, 2010 117,937,174 43,405 23,252,476 85,017,024 9,624,269
Balance, shares at Dec. 31, 2010 43,404,557 43,404,557      
Stock-based compensation from stock options 76,991    76,991      
Issuance of non-vested common stock as compensation 119,192 125 119,067      
Issuance of non-vested common stock as compensation, shares   125,000      
Net income for the year 19,269,642       19,269,642   
Foreign currency translation adjustment 5,080,098          5,080,098
Balance at Dec. 31, 2011 $ 142,483,097 $ 43,530 $ 23,448,534 $ 104,286,666 $ 14,704,367
Balance, shares at Dec. 31, 2011 43,529,557 43,529,557