Fair Value Measurements - Schedule of Fair Value Measurement on Recurring Basis (Details) - USD ($)	Sep. 30, 2019	Jun. 30, 2019
Investment in marketable securities	$ 8,537,000	$ 9,696,000
Level 1 [Member]
Investment in marketable securities	8,537,000	9,696,000
Level 1 [Member] | REITs and Real Estate Companies [Member]
Investment in marketable securities	3,061,000	3,069,000
Level 1 [Member] | Energy [Member]
Investment in marketable securities	1,364,000	950,000
Level 1 [Member] | Consumer Cyclical [Member]
Investment in marketable securities	1,320,000	1,448,000
Level 1 [Member] | Corporate Bonds [Member]
Investment in marketable securities	1,214,000	1,420,000
Level 1 [Member] | Financial Services [Member]
Investment in marketable securities	602,000	951,000
Level 1 [Member] | Basic Material [Member]
Investment in marketable securities	543,000	829,000
Level 1 [Member] | Technology [Member]
Investment in marketable securities	224,000	651,000
Level 1 [Member] | Healthcare [Member]
Investment in marketable securities	114,000	185,000
Level 1 [Member] | Industrials [Member]
Investment in marketable securities	$ 95,000	$ 193,000