Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Allowance for obsolescence (in Dollars)	$ 1,055	$ 875
Common stock, par value (in Dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	21,983,851	21,899,155
Common stock, shares outstanding	19,121,738	19,333,516
Treasury stock, shares	2,862,113	2,565,639