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INVESTMENTS (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Nov. 30, 2018	Jun. 30, 2018
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI	$ 11,625		$ 15,187
Equity Securities, FV-NI, Cost	$ 14,140		14,640
Market value of investments to Company's total assets	58.00%
Other investments	$ 1,396		1,404
Equity Securities, FV-NI, Unrealized Gain (Loss)	(3,062)	$ (951)
Equity Securities without Readily Determinable Fair Value, Amount	1,396	2,168	1,404		$ 2,207
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount	251
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount	661
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount	8	10
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount	617
Income (Loss) from Equity Method Investments	(27)	(7)
Equity Method Investments	279		309
Fair Value, Inputs, Level 1 [Member]
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI	$ 10,892		$ 14,355
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value	94.00%		95.00%
Fair Value, Inputs, Level 2 [Member]
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI	$ 733		$ 832
Percentage of Financial Assets Derived From Level 2 Inputs Measured at Fair Value	6.00%		5.00%
U.S. Global Investors Funds [Member]
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI	$ 8,300		$ 8,800
Equity Securities [Member]
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	3,100
HIVE Blockchain Technologies Ltd. ("HIVE") [Member]
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI	$ 1,800		$ 3,600
Investment Owned, Balance, Shares (in Shares)	10		10
Investment Owned, at Cost					2,400
Investment Owned, Direct Percentage	3.10%
Thunderbird Entertainment Group [Member]
INVESTMENTS (Details) [Line Items]
Investment Owned, Direct Percentage	2.50%
GoldSpot Discoveries, Inc. [Member]
INVESTMENTS (Details) [Line Items]
Investment Owned, Direct Percentage	7.50%
Galileo Technology and Blockchain Fund [Member]
INVESTMENTS (Details) [Line Items]
Equity Method Investment, Aggregate Cost					$ 401
Income (Loss) from Equity Method Investments		$ (7)
Galileo Technology and Blockchain Fund [Member] \| Minimum [Member]
INVESTMENTS (Details) [Line Items]
Equity Method Investment, Ownership Percentage			20.00%
Galileo Technology and Blockchain Fund [Member] \| Maximum [Member]
INVESTMENTS (Details) [Line Items]
Equity Method Investment, Ownership Percentage			25.00%
Galileo Technology and Blockchain Fund LP [Member]
INVESTMENTS (Details) [Line Items]
Equity Method Investment, Aggregate Cost				$ 230
Equity Method Investment, Ownership Percentage	20.00%
Income (Loss) from Equity Method Investments	$ (27)
Equity Method Investments	279
Thunderbird Entertainment Group [Member] \| Equity Securities [Member]
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI	1,100		$ 1,100
Thunderbird Entertainment Group [Member] \| Equity Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI	368		377
Thunderbird Entertainment Group [Member] \| Equity Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI	705		675
GoldSpot Discoveries, Inc. [Member] \| Equity Securities [Member]
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI	467		1,700
GoldSpot Discoveries, Inc. [Member] \| Equity Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI	439		1,600
GoldSpot Discoveries, Inc. [Member] \| Equity Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
INVESTMENTS (Details) [Line Items]
Equity Securities, FV-NI	$ 28		$ 157