Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Common stock par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	33,573,194	33,528,915
Treasury stock, at cost (in shares)	1,594,727	1,729,727