Fair Value Measurements - Schedule of Fair Value Measurement on Recurring Basis (Details) - USD ($)	Mar. 31, 2021	Jun. 30, 2020
Investment in marketable securities	$ 36,996,000	$ 6,178,000
Due to securities broker	(9,021,000)	(1,576,000)
Obligations for securities sold	5,261,000	294,000
Level 1 [Member]
Investment in marketable securities	22,714,000	4,308,000
Due to securities broker	(9,021,000)	(1,576,000)
Obligations for securities sold	(5,261,000)	(294,000)
Level 1 [Member] | REITs and Real Estate Companies [Member]
Investment in marketable securities	11,190,000	2,365,000
Level 1 [Member] | Financial Services [Member]
Investment in marketable securities	7,033,000	282,000
Level 1 [Member] | Energy [Member]
Investment in marketable securities	5,977,000	767,000
Level 1 [Member] | Industrials [Member]
Investment in marketable securities	3,294,000	484,000
Level 1 [Member] | Basic Material [Member]
Investment in marketable securities	3,055,000	1,209,000
Level 1 [Member] | Consumer Cyclical [Member]
Investment in marketable securities	2,350,000	295,000
Level 1 [Member] | Technology [Member]
Investment in marketable securities	1,397,000	121,000
Level 1 [Member] | Healthcare [Member]
Investment in marketable securities	1,285,000	43,000
Level 1 [Member] | Other [Member]
Investment in marketable securities	736,000	38,000
Level 1 [Member] | Communication Services [Member]
Investment in marketable securities	679,000	157,000
Level 1 [Member] | Corporate Bonds [Member]
Investment in marketable securities		$ 417,000