Condensed Consolidated Balance Sheets (unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts (in Dollars) (in Dollars)	$ 227	$ 244
Common stock, par value (in Dollars per share) (in Dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in Shares)	20,000,000	20,000,000
Common stock, shares issued (in Shares)	8,416,343	8,376,592
Common stock, shares outstanding (in Shares)	6,910,928	6,874,992
Treasury stock, shares (in Shares)	1,505,415	1,501,600