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CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares
Jun. 30, 2019
Jun. 30, 2018
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 20,287,574 19,992,204
Common stock, shares outstanding 20,287,574 19,992,204
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 20,166,034 20,365,504
Common stock, shares outstanding 20,166,034 20,365,504