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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
Total
Ordinary shares [Member]
Treasury Stock [Member]
Additional paid in capital [Member]
Retained earnings (accumulated losses) [Member]
Accumulated other comprehensive income (loss) income [Member]
Noncontrolling interest [Member]
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 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 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          
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          
Net income 38,765,537 38,124,705 640,832
Other comprehensive loss (26,356,406) (26,216,079) (140,327)
Share-based compensation 13,788,049 13,788,049
Options exercised $ 110,868 $ 23 110,845
Options exercised, shares 230,225 230,225          
Restricted shares vested $ 927 (927)
Restricted shares vested, shares   9,271,350          
Follow-on equity offering, net of issuance costs of $6,919,202 106,621,643 $ 5,161 106,616,482
Follow-on equity offering, net of issuance costs of $6,919,202 shares   51,609,475          
Acquisition of non-controlling interest (2,326,081) 1,090,572 (123,668) (3,292,985)
Balance at Dec. 31, 2018 $ 525,131,677 $ 33,439 $ (1,748,836) $ 368,681,449 $ 171,398,185 $ (13,232,560)
Balance, shares at Dec. 31, 2018   332,029,752