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15. BUSINESS SEGMENTS (Details 1) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Segments    
Total segment operating income $ 13,745,333 $ 46,702,824
Corporate costs (1,015,963) (682,210)
Unrealized translation difference (1,557,759) 1,702,728
Income from operations 11,171,611 47,723,342
Other income 391,842 312,696
Income before income taxes $ 11,563,453 $ 48,036,038