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15. BUSINESS SEGMENTS (Details 1) - USD ($) | 12 Months Ended
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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

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