BALANCE SHEETS [Parenthetical] (USD $)	Jun. 30, 2013	Dec. 31, 2012
Allowance for doubtful accounts (in dollars)	$ 14,666	$ 15,111
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	8,000,000	8,000,000
Common stock, shares issued	3,261,148	3,261,148
Treasury stock, shares	242,114	242,114