Investments - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Investments
Unrealized gain on equity securities, net	$ 2,285,000		$ 1,240,000
Unrealized loss on equity securities, net		$ 627,000		$ 158,000
Realized gain on the sale of debt and equity securities	$ 876,000	$ 843,000	$ 1,408,000	$ 1,919,000

The increase (decrease), resulting in a gain, 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_UnrealizedGainOnSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration