Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000	100,000,000
Common stock, shares issued (in shares)	34,110,056	34,023,850	33,581,599
Common stock, shares outstanding (in shares)	34,110,056	34,023,850	33,581,599