Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets [Abstract]
Trade accounts receivable, allowance for doubtful accounts	$ 283,000	$ 500,000
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.05	$ 0.05
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	8,461,032	8,422,890
Common stock, shares outstanding	8,461,032	8,422,890