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FINANCIAL STATEMENT SCHEDULE I (STATEMENT OF CHANGES IN EQUITY) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Feb. 28, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]        
Balance   $ 271,728,922 $ 241,656,490 $ 206,768,070
Net income   92,841,128 43,493,756 12,956,889
Share-based compensation   4,200,273 2,702,089 3,687,951
Option Exercised   $ 2,765,418 1,051,586 275,783
Option Exercised, shares   5,596,050    
Follow-on equity offering, net of issuance costs of $2,033,041 $ 28,000,000     27,996,959
Follow-on equity offering, net of issuance costs of $2,033,041, Shares 38,500,000      
Repurchase of ordinary shares       (1,350,164)
Capital injection from non-controlling Shareholders       2,516,457
Restricted shares vested      
Balance   394,528,067 271,728,922 241,656,490
Ordinary shares [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   $ 26,532 $ 26,320 $ 22,358
Balance, shares   262,956,278 260,836,578 223,577,853
Share-based compensation  
Option Exercised   $ 560 $ 212 $ 112
Option Exercised, shares   5,596,050 2,119,700 1,115,625
Follow-on equity offering, net of issuance costs of $2,033,041       $ 3,850
Follow-on equity offering, net of issuance costs of $2,033,041, Shares       38,500,000
Repurchase of ordinary shares      
Repurchase of ordinary shares, Shares       (2,356,900)
Capital injection from non-controlling Shareholders      
Restricted shares vested   $ 236    
Restricted shares vested, Shares   2,366,374    
Balance   $ 27,328 $ 26,532 $ 26,320
Balance, shares   270,918,702 262,956,278 260,836,578
Treasury Stock [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   $ (1,748,836) $ (1,748,836) $ (398,672)
Share-based compensation  
Option Exercised  
Follow-on equity offering, net of issuance costs of $2,033,041      
Repurchase of ordinary shares       (1,350,164)
Capital injection from non-controlling Shareholders      
Restricted shares vested      
Balance   (1,748,836) (1,748,836) (1,748,836)
Additional paid in capital [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   240,111,533 236,358,070 203,125,494
Share-based compensation   4,200,273 2,702,089 3,687,951
Option Exercised   2,764,858 1,051,374 275,671
Follow-on equity offering, net of issuance costs of $2,033,041       27,993,109
Repurchase of ordinary shares      
Capital injection from non-controlling Shareholders       1,275,845
Restricted shares vested   (236)    
Balance   247,076,428 240,111,533 236,358,070
Retained earnings (accumulated losses) [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   40,432,352 (3,061,404) (16,018,293)
Share-based compensation  
Option Exercised  
Follow-on equity offering, net of issuance costs of $2,033,041      
Repurchase of ordinary shares      
Capital injection from non-controlling Shareholders      
Restricted shares vested      
Balance   133,273,480 40,432,352 (3,061,404)
Accumulated other comprehensive income (loss) [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   (8,721,820) 8,780,313 20,037,183
Share-based compensation  
Option Exercised  
Follow-on equity offering, net of issuance costs of $2,033,041      
Repurchase of ordinary shares      
Capital injection from non-controlling Shareholders      
Restricted shares vested      
Balance   13,107,187 (8,721,820) 8,780,313
Parent Company [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   270,099,761 240,354,463 206,768,070
Net income   92,841,128 43,493,756 12,956,889
Other comprehensive loss   21,829,007 (17,502,133) (11,256,870)
Share-based compensation   4,200,273 2,702,089 3,687,951
Option Exercised   2,765,418 1,051,586 275,783
Follow-on equity offering, net of issuance costs of $2,033,041       27,996,959
Repurchase of ordinary shares       (1,350,164)
Capital injection from non-controlling Shareholders       1,275,845
Balance   391,735,587 270,099,761 240,354,463
Parent Company [Member] | Ordinary shares [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   $ 26,532 $ 26,320 $ 22,358
Balance, shares   262,956,278 260,836,578 223,577,853
Option Exercised   $ 560 $ 212 $ 112
Option Exercised, shares   5,596,050 2,119,700 1,115,625
Follow-on equity offering, net of issuance costs of $2,033,041       $ 3,850
Follow-on equity offering, net of issuance costs of $2,033,041, Shares       38,500,000
Repurchase of ordinary shares, Shares       (2,356,900)
Restricted shares vested   $ 236    
Restricted shares vested, Shares   2,366,374    
Balance   $ 27,328 $ 26,532 $ 26,320
Balance, shares   270,918,702 262,956,278 260,836,578
Parent Company [Member] | Treasury Stock [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   $ (1,748,836) $ (1,748,836) $ (398,672)
Repurchase of ordinary shares       (1,350,164)
Balance   (1,748,836) (1,748,836) (1,748,836)
Parent Company [Member] | Additional paid in capital [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   240,111,533 236,358,070 203,125,494
Share-based compensation   4,200,273 2,702,089 3,687,951
Option Exercised   2,764,858 1,051,374 275,671
Follow-on equity offering, net of issuance costs of $2,033,041       27,993,109
Capital injection from non-controlling Shareholders       1,275,845
Restricted shares vested   (236)    
Balance   247,076,428 240,111,533 236,358,070
Parent Company [Member] | Retained earnings (accumulated losses) [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   40,432,352 (3,061,404) (16,018,293)
Net income   92,841,128 43,493,756 12,956,889
Balance   133,273,480 40,432,352 (3,061,404)
Parent Company [Member] | Accumulated other comprehensive income (loss) [Member]        
Condensed Financial Statements, Captions [Line Items]        
Balance   (8,721,820) 8,780,313 20,037,183
Other comprehensive loss   21,829,007 (17,502,133) (11,256,870)
Balance   $ 13,107,187 $ (8,721,820) $ 8,780,313