Consolidated Balance Sheets (Parentheticals) (USD $)	Mar. 31, 2013	Dec. 31, 2012
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	25,359,057	25,362,946
Common stock, shares outstanding	19,352,128	19,197,899
Treasury stock, shares	6,006,929	6,165,047