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Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Apr. 02, 2020
Jun. 14, 2019
Investments        
Observable price changes $ 0.0 $ 0.0    
Series B Preferred Stock        
Investments        
Investments in securities       $ 1.5
Series C Preferred Stock        
Investments        
Investments in securities     $ 1.1