Fair Value Measurements - Schedule of Fair Value Measurement on Recurring Basis (Details) - USD ($)	Mar. 31, 2020	Jun. 30, 2019
Investment in marketable securities	$ 2,853,000	$ 9,696,000
Level 1 [Member]
Investment in marketable securities	2,853,000	9,696,000
Level 1 [Member] | REITs and Real Estate Companies [Member]
Investment in marketable securities	1,671,000	3,069,000
Level 1 [Member] | Basic Material [Member]
Investment in marketable securities	427,000	829,000
Level 1 [Member] | Corporate Bonds [Member]
Investment in marketable securities	360,000	1,420,000
Level 1 [Member] | Consumer Cyclical [Member]
Investment in marketable securities	105,000	1,448,000
Level 1 [Member] | Energy [Member]
Investment in marketable securities	101,000	950,000
Level 1 [Member] | Financial Services [Member]
Investment in marketable securities	86,000	951,000
Level 1 [Member] | Technology [Member]
Investment in marketable securities	43,000	651,000
Level 1 [Member] | Healthcare [Member]
Investment in marketable securities	39,000	185,000
Level 1 [Member] | Industrials [Member]
Investment in marketable securities	$ 21,000	$ 193,000