Fair Value Measurements - Schedule of Fair Value Measurement on Recurring Basis (Details) - USD ($)	Dec. 31, 2020	Jun. 30, 2020
Investment in marketable securities	$ 22,008,000	$ 6,178,000
Level 1 [Member]
Investment in marketable securities	22,008,000	6,178,000
Level 1 [Member] | REITs and Real Estate Companies [Member]
Investment in marketable securities	8,088,000	2,365,000
Level 1 [Member] | Financial Services [Member]
Investment in marketable securities	3,972,000	282,000
Level 1 [Member] | Energy [Member]
Investment in marketable securities	3,233,000	767,000
Level 1 [Member] | Consumer Cyclical [Member]
Investment in marketable securities	1,887,000	295,000
Level 1 [Member] | Technology [Member]
Investment in marketable securities	1,428,000	121,000
Level 1 [Member] | Industrials [Member]
Investment in marketable securities	1,297,000	484,000
Level 1 [Member] | Basic Material [Member]
Investment in marketable securities	1,269,000	1,209,000
Level 1 [Member] | Communication Services [Member]
Investment in marketable securities	442,000	157,000
Level 1 [Member] | Healthcare [Member]
Investment in marketable securities	267,000	43,000
Level 1 [Member] | Other [Member]
Investment in marketable securities	125,000	38,000
Level 1 [Member] | Corporate Bonds [Member]
Investment in marketable securities		$ 417,000