Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)	Mar. 31, 2020	Jun. 30, 2019
Investment in marketable securities	$ 526,000	$ 2,679,000
Level 1 [Member]
Investment in marketable securities	526,000	2,679,000
Basic Materials [Member] | Level 1 [Member]
Investment in marketable securities	262,000	537,000
REITs and Real Estate Companies [Member] | Level 1 [Member]
Investment in marketable securities	258,000	816,000
Consumer Cyclical [Member] | Level 1 [Member]
Investment in marketable securities	3,000	636,000
Energy [Member] | Level 1 [Member]
Investment in marketable securities		286,000
Financial Services [Member] | Level 1 [Member]
Investment in marketable securities		331,000
Other [Member] | Level 1 [Member]
Investment in marketable securities	$ 3,000	$ 73,000