CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Jun. 30, 2018	Jun. 30, 2017
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	16,000,000	16,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Class A common stock
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	19,992,204	19,249,132
Common stock, shares outstanding	19,992,204	19,249,132
Class B common stock
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	20,365,504	20,626,836
Common stock, shares outstanding	20,365,504	20,626,836