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13. BUSINESS SEGMENTS (Details 2) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenue, Major Customer [Line Items]        
Revenues $ 47,531,989 $ 47,600,767 $ 80,320,482 $ 82,096,217