Fair Value Measurements - Schedule of Fair Value Measurement on Recurring Basis (Details) - USD ($)	Jun. 30, 2021	Jun. 30, 2020
Investment in marketable securities	$ 35,792,000	$ 6,178,000
Level 1 [Member]
Investment in marketable securities	35,792,000	6,178,000
Level 1 [Member] | REITs and Real Estate Companies [Member]
Investment in marketable securities	11,624,000	2,365,000
Level 1 [Member] | Energy [Member]
Investment in marketable securities	6,374,000	767,000
Level 1 [Member] | Communication Services [Member]
Investment in marketable securities	4,872,000
Level 1 [Member] | Financial Services [Member]
Investment in marketable securities	3,873,000
Level 1 [Member] | Industrials [Member]
Investment in marketable securities	3,746,000	484,000
Level 1 [Member] | Consumer Cyclical [Member]
Investment in marketable securities	1,702,000
Level 1 [Member] | Healthcare [Member]
Investment in marketable securities	981,000
Level 1 [Member] | Technology [Member]
Investment in marketable securities	442,000
Level 1 [Member] | Other [Member]
Investment in marketable securities	$ 381,000	936,000
Level 1 [Member] | Basic Material [Member]
Investment in marketable securities		1,209,000
Level 1 [Member] | Corporate Bonds [Member]
Investment in marketable securities		$ 417,000