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INVESTMENTS (Details)
$ in Thousands, shares in Millions

3 Months Ended

Sep. 30, 2017

USD ($)

shares

Sep. 30, 2016

USD ($)

Jun. 30, 2017

USD ($)

INVESTMENTS (Details) [Line Items]

Fair value of investments held

$ 22,455

$ 13,121

Cost basis of investments held

$ 13,103

13,588

Market value of investments to Company's total assets

62.70%

Other investments

$ 2,119

2,130

Equity Method Investments

2,013

0

Available-for-sale, net unrealized gain (loss), gross

9,595

461

Available-for-sale, net unrealized gain (loss), net of tax

9,595

461

Other-than-temporary impairments

0

$ 16

Available-for-sale securities, fair value

^[1],[2]

14,944

3,401

Trading Securities

^[2]

7,511

9,720

Income (Loss) from Equity Method Investments

1,513

0

Fair Value, Inputs, Level 1 [Member]

INVESTMENTS (Details) [Line Items]

Fair value of investments held

$ 11,005

$ 12,706

Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value

49.00%

100.00%

Available-for-sale securities, fair value

$ 3,549

$ 3,401

Trading Securities

7,456

9,305

Fair Value, Inputs, Level 2 [Member]

INVESTMENTS (Details) [Line Items]

Fair value of investments held

$ 11,395

0

Percentage of Financial Assets Derived From Level 2 Inputs Measured at Fair Value

51.00%

Available-for-sale securities, fair value

$ 11,395

0

Trading Securities

0

$ 0

U.S. Global Investors Funds [Member]

INVESTMENTS (Details) [Line Items]

Investments, Fair Value Disclosure

8,900

Offshore Fund [Member]

INVESTMENTS (Details) [Line Items]

Investments, Fair Value Disclosure

55

Offshore Fund [Member] | Net Asset Value Per Share [Member]

INVESTMENTS (Details) [Line Items]

Trading Securities

55

$ 415

HIVE Blockchain Technologies Ltd. ("HIVE") [Member]

INVESTMENTS (Details) [Line Items]

Available-for-sale securities, fair value

$ 11,400

Investment Owned, Direct, Percentage

4.40%

Investment Owned, Percentage

5.30%

Galileo Partners Fund [Member]

INVESTMENTS (Details) [Line Items]

Equity Method Investment, Ownership Percentage

30.00%

Impaired Securities [Member]

INVESTMENTS (Details) [Line Items]

Number of positions, subject to impairment loss

2

Available-for-Sale Securities, Combined Cost Basis of Impaired Securities

$ 98

Available-for-Sale Securities, Combined Fair Value of Impaired Securities

$ 82

HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Galileo Partners Fund [Member]

INVESTMENTS (Details) [Line Items]

Investment Owned, Balance, Shares (in Shares) | shares

6.7

[1]	Net unrealized gains (losses) on available-for-sale securities gross and net of tax as of September 30, 2017, are $9,595 and $9,595, respectively, and as of June 30, 2017, are $461 and $461, respectively.
[2]	Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.

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