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v2.4.1.9

Organization and Business (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 46 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 29, 2010 | Oct. 31, 2018 | Mar. 31, 2015 | Jan. 08, 2015 | Sep. 29, 2014
Subsidiary shares issued | 1.6 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction |  |  |  |
Acreage of Unpatented Mining Claims-Alaska |  |  | 71,896 ctgo_AcreageofUnpatentedMiningClaimsAlaska |  |
Royal Gold initial investment |  |  |  | $ 5 ctgo_RoyalGoldinitialinvestment |
Royal Gold percentage of interest in Joint Venture |  |  | 0.00%ctgo_RoyalGoldpercentageofinterestinJointVenture |  |
Contango's percentage of interest in Joint Venture Company |  |  | 100.00%ctgo_ContangospercentageofinterestinJointVentureCompany |  |
royalgoldjointventure |  | 30 ctgo_Royalgoldjointventure |  |  |
joint adventure economic interest |  |  |  | 40.00%ctgo_Jointadventureeconomicinterest |
additional new mining claims-state of Alaska |  |  | 59 ctgo_AdditionalnewminingclaimsstateofAlaska |  |
unpatented mining claims-Eagle |  |  | 9,439 ctgo_UnpatentedminingclaimsEagle |  |
Native Village of Tetlin Land [Member] |  |  |  |  |
Percentage of Leasehold Interest | 100.00%ctgo_PercentageOfLeaseholdInterest / us-gaap_StatementGeographicalAxis = ctgo_NativeVillageOfTetlinLandMember |  |  |  |
Leasehold Interest Acreage | 675,000 ctgo_LeaseholdInterestAcreage / us-gaap_StatementGeographicalAxis = ctgo_NativeVillageOfTetlinLandMember |  |  |  |
Initial and Renewal Terms of Leases and Concessions on Undeveloped Acreage |  |  | 10 years |  |
Contango [Member] |  |  |  |  |
Parent contribution | 3.5 ctgo_ParentContribution / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ctgo_ContangoMember |  |  |  |
JEX [Member] |  |  |  |  |
Overriding royalty interest |  |  | 3.00%ctgo_OverridingRoyaltyInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ctgo_JexMember |  |
JEX [Member] | ALASKA |  |  |  |  |
the number of unpatented state of Alaska mining claims |  |  | 474 ctgo_ThenumberofunpatentedstateofAlaskaminingclaims / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ctgo_JexMember / us-gaap_StatementGeographicalAxis = stpr_AK |  |
Overriding royalty interest |  |  | 2.00%ctgo_OverridingRoyaltyInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ctgo_JexMember / us-gaap_StatementGeographicalAxis = stpr_AK |  | 2.00%ctgo_OverridingRoyaltyInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ctgo_JexMember / us-gaap_StatementGeographicalAxis = stpr_AK
Unpatented Mining Claims from the State of Alaska for Gold and Minerals [Member] |  |  |  |  |
Acreage of Unpatented Mining Claims | 18,021 ctgo_AcreageOfUnpatentedMiningClaims / ctgo_UnpatentedMiningClaimsAxis = ctgo_UnpatentedMiningClaimsFromStateOfAlaskaForGoldAndMineralsMember |  |  |  |

X
- Definition Acreage of Unpatented Mining Claims + References No definition available. + Details
Name: | ctgo_AcreageOfUnpatentedMiningClaims
Namespace Prefix: | ctgo_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Acreage of Unpatented Mining Claims-Alaska + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition additional new mining claims-state of Alaska + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contango's percentage of interest in Joint Venture Company + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Initial & Renewal Terms of Leases and Concessions on Undeveloped Acreage + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition joint adventure economic interest + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Leasehold Interest Acreage + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Overriding Royalty Interest + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Parent Contribution + References No definition available. + Details
Name: | ctgo_ParentContribution
Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of Leasehold Interest for Native Village of Tetlin, an Alaska Native Tribe, Lease + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Royal Gold initial investment + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Royal Gold Joint Venture Investment + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Royal Gold percentage of interest in Joint Venture + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition the number of unpatented state of Alaska mining claims + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition unpatented mining claims-Eagle + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |