Investment in Marketable Securities, Net (Details Narrative) - USD ($)	9 Months Ended	12 Months Ended
Mar. 31, 2020	Jun. 30, 2019
Trading securities, continuous unrealized loss position, 12 months or longer, aggregate loss	$ 5,291,000	$ 8,617,000
Unrealized gain (loss) on investments	5,221,000	$ 8,556,000
Unrealized gain on securities reclassed	$ 3,628,000
Comstock Mining, Inc [Member]
Investment marketable securities, percentage	41.00%	19.00%

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455

Name:	us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant