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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues $ 150,747,316 $ 123,989,917 $ 102,142,828
Cost of Sales (117,797,241) (97,814,315) (82,107,531)
Gross Profit 32,950,075 26,175,602 20,035,297
Selling, General and Administrative Expenses (2,517,530) (3,074,256) (2,029,201)
Loss from Disposal of Property, Plant and Equipment (321,200) (1,115,362)  
Income from Operations 30,111,345 21,985,984 18,006,096
Other Income (Expense):      
Interest income 36,437 163,183 108,610
Interest expense (699,892) (633,010) (728,429)
Income before Income Taxes 29,447,890 21,516,157 17,386,277
Provision for Income Taxes (7,799,226) (5,964,621) (4,666,069)
Net Income 21,648,664 15,551,536 12,720,208
Other Comprehensive Income:      
Foreign currency translation adjustment 4,304,334 3,159,472 (108,534)
Total Comprehensive Income $ 25,952,998 $ 18,711,008 $ 12,611,674
Earnings Per Share:      
Basic Earnings per Share $ 1.18 $ 0.89 $ 1.04
Fully Diluted Earnings per Share $ 1.18 $ 0.89 $ 1.04
Weighted Average Number of Shares      
Outstanding - Basic 18,349,332 17,435,218 12,221,782
Outstanding - Fully Diluted 18,349,332 17,436,246 12,232,878