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Note 4 - Investment in the Joint Venture Company (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 51 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Apr. 26, 2018 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015 | Jan. 08, 2015 | Jun. 30, 2014
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Cumulative Investment |  |  |  |  |  |  | $ 7,200,000 |  |  |  |  |  |  |
Suspended Losses |  |  |  |  | 23,200,000 |  |  |  |  |  |  |  |  |
The Joint Venture Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Aggregate Cost | $ 1,400,000 |  | $ 1,400,000 |  | $ 1,400,000 | $ 1,400,000 |  |  |  |  |  |  | $ 1,400,000 |
Equity Method Investment, Ownership Percentage | 60.00% |  | 60.00% |  | 60.00% | 60.00% |  |  | 60.00% |  |  |  |  |
Loss from Equity Method Investments, Unrecorded | $ 200,000 | $ 300,000 | $ 3,500,000 | $ 3,400,000 |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Inception-to-date Cumulative Income (Loss) | 30,400,000 |  | 30,400,000 |  | $ 30,400,000 | $ 30,400,000 |  | 27,000,000 |  |  |  |  |  |
Equity Method Investments | $ 0 |  | 0 |  | $ 0 | 0 |  | $ 0 |  | $ 0 | $ 0 | $ 0 |  | $ 0
The Joint Venture Company [Member] | Royal Gold [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Interest in Joint Venture |  |  | $ 33,900,000 |  |  | $ 33,900,000 |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 40.00% |  | 40.00% |  | 40.00% | 40.00% |  |  | 40.00% |  |  |  |  |

X
- Definition The amount of cumulative investment in equity method investments. + References No definition available. + Details
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- Definition Represents the cumulative income (loss), from inception to the balance sheet date, of an equity method investment. + References No definition available. + Details
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- Definition Represents entity's share of losses from equity method investment including losses that are not recognized in earnings + References No definition available. + Details
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- Definition Represents the suspended losses incurred during the period. This may be for, example, an equity method investment. + References No definition available. + Details
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- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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