Fair Value Measurements - Schedule of Fair Value Measurement on Recurring Basis (Details) - USD ($)	Dec. 31, 2019	Jun. 30, 2019
Investment in marketable securities	$ 8,148,000	$ 9,696,000
Level 1 [Member]
Investment in marketable securities	8,148,000	9,696,000
Level 1 [Member] | REITs and Real Estate Companies [Member]
Investment in marketable securities	3,263,000	3,069,000
Level 1 [Member] | Energy [Member]
Investment in marketable securities	1,278,000	950,000
Level 1 [Member] | Insurance [Member]
Investment in marketable securities	1,109,000
Level 1 [Member] | Corporate Bonds [Member]
Investment in marketable securities	883,000	1,420,000
Level 1 [Member] | Consumer Cyclical [Member]
Investment in marketable securities	572,000	1,448,000
Level 1 [Member] | Basic Material [Member]
Investment in marketable securities	546,000	829,000
Level 1 [Member] | Financial Services [Member]
Investment in marketable securities	278,000	951,000
Level 1 [Member] | Technology [Member]
Investment in marketable securities	149,000	651,000
Level 1 [Member] | Industrials [Member]
Investment in marketable securities	70,000	193,000
Level 1 [Member] | Healthcare [Member]
Investment in marketable securities		$ 185,000