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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
Total
Ordinary shares [Member]
Treasury Stock [Member]
Additional paid in capital [Member]
Accumulated Loss [Member]
Accumulated other comprehensive income (loss) [Member]
Noncontrolling interest [Member]
Balance at Dec. 31, 2014 $ 206,768,070 $ 22,358 $ (398,672) $ 203,125,494 $ (16,018,293) $ 20,037,183
Balance, shares at Dec. 31, 2014   223,577,853          
Net income 13,047,584 12,956,889 90,695
Other comprehensive income (loss) (11,286,150) (11,256,870) (29,280)
Share-based compensation 3,687,951 3,687,951
Follow-on equity offering, net of issuance costs of $2,033,041 27,996,959 $ 3,850 27,993,109
Follow-on equity offering, net of issuance costs of $2,033,041,shares   38,500,000          
Options exercised 275,783 $ 112 275,671
Options exercised, shares   1,115,625          
Repurchase of ordinary shares (1,350,164) (1,350,164)
Repurchase of ordinary shares, shares   (2,356,900)          
Capital injection from noncontrolling shareholders 2,516,457 1,275,845 1,240,612
Balance at Dec. 31, 2015 241,656,490 $ 26,320 (1,748,836) 236,358,070 (3,061,404) 8,780,313 1,302,027
Balance, shares at Dec. 31, 2015   260,836,578          
Net income 43,923,997 43,493,756 430,241
Other comprehensive income (loss) (17,605,240) (17,502,133) (103,107)
Share-based compensation 2,702,089 2,702,089
Options exercised 1,051,586 $ 212 1,051,374
Options exercised, shares   2,119,700          
Balance at Dec. 31, 2016 271,728,922 $ 26,532 (1,748,836) 240,111,533 40,432,352 (8,721,820) 1,629,161
Balance, shares at Dec. 31, 2016   262,956,278          
Net income 93,855,400 92,841,128 1,014,272
Other comprehensive income (loss) 21,978,054 21,829,007 149,047
Share-based compensation 4,200,273 4,200,273
Options exercised $ 2,765,418 $ 560 2,764,858
Options exercised, shares 5,596,050 5,596,050          
Restricted shares vested $ 236 (236)
Restricted shares vested, shares   2,366,374          
Balance at Dec. 31, 2017 $ 394,528,067 $ 27,328 $ (1,748,836) $ 247,076,428 $ 133,273,480 $ 13,107,187 $ 2,792,480
Balance, shares at Dec. 31, 2017   270,918,702