Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Balance Sheets [Abstract]
Accounts receivable, allowance	$ 361,350	$ 379,817
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	23,900	23,900
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	22,805,731	22,063,582
Treasury stock, shares	4,015	4,015