Fair Value Measurements - Schedule of Fair Value Measurement on Recurring Basis (Details) - USD ($)	Sep. 30, 2020	Jun. 30, 2020
Investment in marketable securities	$ 8,666,000	$ 6,178,000
Level 1 [Member]
Investment in marketable securities	8,666,000	6,178,000
Level 1 [Member] | REITs and Real Estate Companies [Member]
Investment in marketable securities	4,353,000	2,365,000
Level 1 [Member] | Energy [Member]
Investment in marketable securities	999,000	767,000
Level 1 [Member] | Basic Material [Member]
Investment in marketable securities	987,000	1,209,000
Level 1 [Member] | Financial Services [Member]
Investment in marketable securities	624,000	282,000
Level 1 [Member] | Consumer Cyclical [Member]
Investment in marketable securities	592,000	295,000
Level 1 [Member] | Technology [Member]
Investment in marketable securities	451,000	121,000
Level 1 [Member] | Industrials [Member]
Investment in marketable securities	390,000	484,000
Level 1 [Member] | Communication Services [Member]
Investment in marketable securities	180,000	157,000
Level 1 [Member] | Healthcare [Member]
Investment in marketable securities	90,000	43,000
Level 1 [Member] | Corporate Bonds [Member]
Investment in marketable securities		417,000
Level 1 [Member] | Other [Member]
Investment in marketable securities		$ 38,000