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Investments - Narrative (Details) - USD ($)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale securities, realized losses $ 0 $ 0  
Net unrealized holding gains for securities 2,725,000 $ 41,000 $ 223,000
Investment at cost 2,000,000    
Fair Value, Inputs, Level 3      
Debt Securities, Available-for-sale [Line Items]      
Equity securities without readily determinable fair value, amount $ 500,000