Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	59,008,138	58,488,299
Common stock, shares outstanding	55,148,868	54,695,473
Treasury stock, shares	3,859,270	3,792,826