CONSOLIDATED STATEMENTS OF CHANGE IN EQUITY - USD ($)	Total	Common stock [Member]	Additional paid-in capital [Member]	Statutory and other reserves [Member]	Retained earnings [Member]	Accumulated other comprehensive income [Member]	Non-controlling interest [Member]
Balance at Dec. 31, 2016	$ 45,296,737	$ 1,511	$ 11,580,934	$ 4,992,463	$ 29,266,068	$ (873,582)	$ 329,343
Balance (in shares) at Dec. 31, 2016		15,114,991
Proceeds from exercise of stock options	802,691	$ 30	802,661	0	0	0	0
Proceeds from exercise of stock options (in shares)		294,667
Foreign currency translation adjustments	4,234,078	$ 0	0	0	0	4,196,024	38,054
Share-based compensation expenses	326,171	$ 10	326,161	0	0	0	0
Share-based compensation expenses (in shares)		100,000
Transfer to statutory and other reserves	0	$ 0	0	1,705,747	(1,705,747)	0	0
Net income	17,213,896	0	0	0	16,772,852	0	441,044
Deconsolidation of a subsidiary	(661,388)	0	0	(148,395)	148,395	147,053	(808,441)
Balance at Dec. 31, 2017	67,212,185	$ 1,551	12,709,756	6,549,815	44,481,568	3,469,495	0
Balance (in shares) at Dec. 31, 2017		15,509,658
Shares issued for legal case settlement	212,500	$ 5	212,495	0	0	0	0
Shares issued for legal case settlement (in shares)		50,000
Foreign currency translation adjustments	(4,264,330)	$ 0	0	0	0	(4,264,330)	0
Share-based compensation expenses	941,031	$ 0	941,031	0	0	0	0
Share-based compensation expenses (in shares)		0
Transfer to statutory and other reserves	0	$ 0	0	1,462,237	(1,462,237)	0	0
Net income	13,154,581	0	0	0	13,154,581	0	0
Balance at Dec. 31, 2018	$ 77,255,967	$ 1,556	$ 13,863,282	$ 8,012,052	$ 56,173,912	$ (794,835)	$ 0
Balance (in shares) at Dec. 31, 2018		15,559,658