CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Trade accounts receivable, allowance for doubtful accounts	$ 75,000	$ 63,600
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	8,458,389	8,205,116
Common stock in treasury, shares	351,503	351,503