Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Preferred stock par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	3,000,000	3,000,000
Preferred stock, shares issued (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	200,000,000	200,000,000
Common Stock, shares issued (in shares)	40,985,000	41,098,000
Common Stock, shares outstanding (in shares)	40,985,000	41,098,000
Treasury Stock at cost, shares (in shares)	5,051,000	4,830,000