Investments - Additional Information (Details) - USD ($)	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Investments
Unrealized loss on equity securities, net	$ 785,000	$ 1,785,000
Realized gain on the sale of debt and equity securities	$ 2,252,000	$ 467,000

The increase (decrease), resulting in a loss, in the difference between the fair value and the carrying value, or in the comparative fair values, of securities held at each balance sheet date, that was included in earnings for the period.

No definition available.

Name:	us-gaap_UnrealizedLossOnSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration