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Consolidated Statements of Income and Comprehensive Income (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statements Of Income and Comprehensive Income [Abstract]      
Revenues $ 151,116,806 $ 150,747,316 $ 123,989,917
Cost of Sales (124,060,559) (117,797,241) (97,814,315)
Gross Profit 27,056,247 32,950,075 26,175,602
Selling, general and administrative expenses (3,360,520) (2,517,530) (3,074,256)
Loss on impairment of assets (2,762,349)      
Gain (Loss) from disposal of property, plant and equipment 45,288 (321,200) (1,115,362)
Income from Operations 20,978,666 30,111,345 21,985,984
Other Income (Expense):      
Interest income 30,674 36,437 163,183
Interest expense (871,834) (699,892) (633,010)
Income before Income Taxes 20,137,506 29,447,890 21,516,157
Provision for Income Taxes (5,464,843) (7,799,226) (5,964,621)
Net Income 14,672,663 21,648,664 15,551,536
Other Comprehensive Income:      
Foreign currency translation adjustment 884,872 4,304,334 3,159,472
Total Comprehensive Income $ 15,557,535 $ 25,952,998 $ 18,711,008
Earnings Per Share:      
Basic Earnings per Share $ 0.79 $ 1.18 $ 0.89
Fully Diluted Earnings per Share $ 0.79 $ 1.18 $ 0.89
Weighted Average Number of Shares      
Outstanding - Basic 18,456,781 18,349,332 17,435,218
Outstanding - Fully Diluted 18,456,781 18,349,332 17,436,246