Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Trade accounts receivable, less allowance for doubtful accounts	$ 18,209,734	$ 15,664,496
Other receivables, less allowance for doubtful accounts	$ 40,010	$ 71,548
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	95,000,000	95,000,000
Common stock, shares issued	43,579,557	43,579,557
Common stock, shares outstanding	43,579,557	43,579,557