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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
NET REVENUE    
Net revenue $ 149,275,002 $ 162,317,120
OPERATING INCOME (EXPENSE)    
Cost of net revenue (94,785,671) (109,035,870)
Sales, marketing and other operating expenses (343,105) (375,365)
Research and development cost (261,931) (230,590)
Exploration cost 0 (325,840)
Write-off / Impairment on property, plant and equipment (106,545) (969,638)
Loss from disposal of property, plant and equipment (1,053,445) 0
General and administrative expenses (5,434,755) (6,668,838)
Other operating income 433,792 453,731
Total Costs and Expenses (101,551,660) (117,152,410)
INCOME FROM OPERATIONS 47,723,342 45,164,710
OTHER INCOME (EXPENSES)    
Interest expense (174,921) (194,036)
Interest income 487,617 469,271
Other income/expense 312,696 275,235
INCOME BEFORE TAXES 48,036,038 45,439,945
INCOME TAXES (11,810,207) (11,371,908)
NET INCOME 36,225,831 34,068,037
COMPREHENSIVE INCOME:    
NET INCOME 36,225,831 34,068,037
OTHER COMPREHENSIVE INCOME    
- Foreign currency translation adjustments (24,930,808) (21,740,602)
COMPREHENSIVE INCOME $ 11,295,023 $ 12,327,435
EARNINGS PER SHARE    
BASIC $ 0.78 $ 0.75
DILUTED $ 0.78 $ 0.74
WEIGHTED AVERAGE NUMBER OF SHARES    
BASIC 46,279,033 45,167,288
DILUTED 46,625,663 46,109,404