Condensed Consolidated Balance Sheets (unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Trade accounts receivable, allowance (in Dollars)	$ 1,550	$ 1,157
Preferred stock par value (in Dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in Shares)	10,000,000	10,000,000
Preferred stock, shares issued (in Shares)	0	0
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in Shares)	40,000,000	40,000,000
Common stock, shares issued (in Shares)	11,385,997	11,384,207
Common stock, shares outstanding (in Shares)	8,655,172	8,701,607
Treasury stock, shares (in Shares)	2,730,825	2,682,600