Consolidated Balance Sheets (Parentheticals) - $ / shares
Jun. 30, 2017
Jun. 30, 2016
Statement of Financial Position [Abstract]    
Preferred stock, par value per share (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 100 100
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock par value per share (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 250,000,000 100,000,000
Common stock, shares issued 90,969,919 71,922,836
Common stock, shares outstanding 90,969,919 71,922,836