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Note 8 - Investment in Peak Gold, LLC (Details Textual) - USD ($)	12 Months Ended		42 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Oct. 31, 2018	Jun. 30, 2016	Jun. 30, 2015	Jan. 08, 2015	Jun. 30, 2014
Equity Method Investments
The Joint Venture Company [Member]
Equity Method Investment, Aggregate Cost							$ 1,400,000
Payments to Acquire Interest in Joint Venture	$ 2,600,000
Equity Method Investment, Ownership Percentage	60.00%	70.50%	60.00%				100.00%
Loss from Equity Method Investments, Unrecorded	$ 5,800,000	$ 10,300,000
Equity Method Investment, Summarized Financial Information, Inception-to-date Cumulative Income (Loss)	27,000,000	21,200,000	$ 27,000,000
Equity Method Investments	0	$ 0	0		$ 0	$ 0		$ 0
Suspended Losses	22,900,000
The Joint Venture Company [Member] | Royal Gold [Member]
Payments to Acquire Interest in Joint Venture	$ 31,700,000		$ 31,700,000
Equity Method Investment, Ownership Percentage	40.00%		40.00%	60.00%

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- Definition

Represents the cumulative income (loss), from inception to the balance sheet date, of an equity method investment.

+ References

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- Definition

Represents entity's share of losses from equity method investment including losses that are not recognized in earnings

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- Definition

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- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ References

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-SubTopic 10
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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

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+ References

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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