Consolidated Balance Sheets (Parentheticals) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	25,033,220	25,134,223
Common stock, shares outstanding (in shares)	17,996,223	17,969,636
Treasury stock, shares (in shares)	7,036,997	7,164,587