Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) [Abstract]
Trade accounts receivable, allowance	$ 280	$ 253
Common stock, par value per share (in dollars per share)	$ 0.02	$ 0.02
Common stock, authorized shares (in shares)	28,000,000	28,000,000
Common stock, Issued shares (in shares)	12,123,259	12,075,030
Preferred stock, par value per share (in dollars per share)	$ 0.02	$ 0.02
Preferred stock, authorized shares (in shares )	2,000,000	2,000,000
Preferred stock, issued shares (in shares )	0	0
Treasury stock, shares	254,142	301,772