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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Additional Information) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Oct. 31, 2017
Feb. 17, 2016
Basis of presentation          
Working capital $ 74,100,000        
Net income 93,855,400 $ 43,923,997 $ 13,047,584    
Cash flow from operations 142,700,000        
Restricted cash          
Restricted cash 11,989,559 15,893,467      
Inventories          
Inventory write-down 62,422    
Prepaid land use rights          
Lease Expenses 572,722 557,162 595,716    
Impairment of long-lived assets          
Long-lived asset impairment 2,987,668 198,689 1,622,588    
Shipping and handling          
Shipping and handling costs 4,385,217 3,147,594 2,708,962    
Government subsidies          
Unrestricted cash government subsidies 6,668,867 4,742,635 3,578,865    
Government grants related to assets   323,769 690,889    
Foreign currency translation          
Aggregate amount of cash and cash equivalents and restricted cash denominated in RMB 66,433,887 28,839,371      
Noncontrolling interest          
Noncontrolling interest 2,792,480 1,629,161      
Treasury Stock          
Share repurchase program, authorized amount 5,000,000        
Purchase price of treasury stock 1,350,164    
Investment accounted for under cost-method          
Cost Method Investments 687,074 581,581      
Operating Leases, Future Minimum Payments Due 1,069,937        
Allocated Share-based Compensation Expense 4,200,273 2,702,089 3,687,951    
Syed Fire Safety Service Co [Member]          
Investment accounted for under cost-method          
Cost Method Investment, Ownership Percentage         15.29%
Cost Method Investments       $ 63,793 $ 581,581
Ordinary shares [Member]          
Basis of presentation          
Net income    
Treasury Stock          
Number of shares repurchased     2,356,900