Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consolidated Statements of Comprehensive Income
Net income	$ 25,072,002	$ 10,362,448	$ 3,160,385
Foreign currency translation adjustment	(143,963)	(336,671)	(309,005)
Total comprehensive income	$ 24,928,039	$ 10,025,777	$ 2,851,380