Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Trade accounts receivable, less allowance for doubtful accounts	$ 18,238,248	$ 18,209,734
Other receivables, less allowance for doubtful accounts	$ 40,069	$ 40,010
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