BALANCE SHEETS [Parenthetical] - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts	$ 58,684	$ 95,525
Preferred stock, par value (in dollars per share)	$ 0.005	$ 0.005
Preferred stock, shares authorized	872,521	872,521
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.005	$ 0.005
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	6,090,671	6,043,191
Common Stock, Shares, Outstanding	5,422,541	5,375,061
Treasury stock, shares	668,130	668,130