Investment in Marketable Securities - Schedule of Net Loss on Marketable Securities Comprising of Realized and Unrealized Gains (Losses) (Details) - USD ($)	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Realized loss on marketable securities	$ (641,000)	$ (806,000)
Unrealized loss on marketable securities related to Comstock		(254,000)
Unrealized loss on marketable securities	(1,272,000)	(673,000)
Net loss on marketable securities	$ (1,913,000)	$ (1,733,000)

Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27476-111563

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- Definition

Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

No definition available.

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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

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Amount of unrealized gain (loss) on investment in marketable security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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