Consolidated Balance Sheets (Parentheticals) - $ / shares	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	25,212,715	25,240,055
Common stock, shares outstanding	18,873,985	18,953,567
Treasury stock, shares	6,338,730	6,286,488