CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Trade accounts receivable, allowance for doubtful accounts	$ 78,000	$ 75,000
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	8,458,389
Common stock in treasury, shares	351,503	351,503