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Note 8 - Formation of Joint Venture Company (Details Textual) - USD ($) |  | 9 Months Ended | 51 Months Ended |
--- | --- | --- | --- | ---
Jan. 08, 2015 | Mar. 31, 2019 | Mar. 31, 2019 | Apr. 26, 2018
The Joint Venture Company [Member] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00% |  |  |
The Joint Venture Company [Member] |  |  |  |
Equity Method Investment, Aggregate Cost | $ 1,400,000 | $ 1,400,000 | $ 1,400,000 |
Investments in Joint Ventures, Contributed Assets Value | 45,700,000 |  |  |
Equity Method Investment, Ownership Percentage |  | 60.00% | 60.00% | 60.00%
The Joint Venture Company [Member] | Royal Gold [Member] |  |  |  |
Initial Investment to Fund Exploration Activity | $ 5,000,000 |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 0.00% |  |  |
Reimbursement from Joint Venture Co-founder | $ 750,000 |  |  |
Percentage of Economic Interest That May Be Obtained | 40.00% |  |  |
Amount of Economic Interest That May Be Obtained | $ 30,000,000 |  |  |
Equity Method Investment, Cumulative Contributions if Additional Contributions Made |  |  |  | $ 30,000,000
Equity Method Investment, Ownership Percentage |  | 40.00% | 40.00% | 40.00%
Payments to Acquire Interest in Joint Venture |  | $ 33,900,000 | $ 33,900,000 |
Additional Economic Interest Sellable |  | 20.00% | 20.00% |

X
- Definition Represents the additional economic interest in an investment that another entity may, once it has acquired the agreed-upon interest, require the reporting entity to sell. + References No definition available. + Details
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- Definition Represents the amount of economic interest in an investment that may be obtained by an entity. + References No definition available. + Details
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X
- Definition The amount of cumulative contributions in an equity method investment if additional contributions are made by the investing entity. + References No definition available. + Details
Name: | ctgo_EquityMethodInvestmentCumulativeContributionsIfAdditionalContributionsMade
Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of initial investment for the purpose of funding exploration activity. + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the agreed fair value of the contributed assets pertaining to an investment. + References No definition available. + Details
Name: | ctgo_InvestmentsInJointVenturesContributedAssetsValue
Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the percentage of economic interest in an investment that may be obtained by an entity. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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X
- Definition Represents the amount of reimbursement paid to the entity during the period from the co-founder of a joint venture. + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + 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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X
- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118582676&loc=SL6759159-111685 + Details
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- Details
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- Details
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X
- Details
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Period Type: |