CONDENSED BALANCE SHEETS [Parenthetical] (USD $)	Mar. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts	$ 148,605	$ 144,921
Accumulated depreciation, depletion and amortization, property, plant, and equipment	$ 5,368,057	$ 5,175,722
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	5,991,945	5,981,896
Common Stock, Shares, Outstanding	0	0
Treasury stock, shares	668,130	668,130