Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
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)	40,829,000	40,854,000
Common Stock, shares outstanding (in shares)	40,829,000	40,854,000
Treasury Stock at cost, shares (in shares)	5,525,000	5,436,000