BALANCE SHEETS [Parenthetical] (USD $)	Dec. 31, 2011	Dec. 31, 2010
Allowance for accounts receivable (in dollars)	$ 169,191	$ 119,295
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	5,903,552	5,877,358
Common stock, shares, outstanding	5,235,422	5,213,013
Treasury stock, shares	668,130	665,345