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Common Stock, Preferred Stock and Dividends - Summary of preferred and common shares (Details) - $ / shares
Jun. 30, 2019
Jun. 30, 2018
Class of Stock [Line Items]    
Preferred stock, shares authorized 16,000,000 16,000,000
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock-Class A    
Class of Stock [Line Items]    
Common stock, shares authorized 300,000,000 300,000,000
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares issued 20,287,574 19,992,204
Common stock, shares outstanding 20,287,574 19,992,204
Common stock-Class B    
Class of Stock [Line Items]    
Common stock, shares authorized 30,000,000 30,000,000
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares issued 20,166,034 20,365,504
Common stock, shares outstanding 20,166,034 20,365,504