Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED BALANCE SHEETS
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock; authorized shares	300,000,000	300,000,000
Common stock; shares issued	45,960,206	44,676,167
Common stock; outstanding shares	45,198,491	44,646,767