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Subsequent Events Subsequent Events details (Details) (USD $) In Millions, except Share data, unless otherwise specified | 24 Months Ended | 46 Months Ended |
--- | --- | --- | ---
Jan. 08, 2017 | Oct. 31, 2018 | Jan. 08, 2015
Subsequent Event [Line Items] |  |  |
royalgoldjointventure |  | $ 30 ctgo_Royalgoldjointventure |
Royal Gold initial investment |  |  | $ 5 ctgo_RoyalGoldinitialinvestment
Contango Joint Venture Percentage |  |  | 100.00%ctgo_ContangoJointVenturePercentage
joint adventure economic interest |  |  | 40.00%ctgo_Jointadventureeconomicinterest
ADDITIONAL ECONOMIC INTEREST SELLABLE |  |  | 20.00%ctgo_ADDITIONALECONOMICINTERESTSELLABLE
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  |  | 10,000 ctgo_Restrictedstockissuedshares
restricted stock issued shares DIRECTORS |  |  | 30,000 ctgo_RestrictedstockissuedsharesDIRECTORS
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options |  |  | 10,000 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
remaining shares to be vested in two years | two-thirds |  |

X
- Definition Joint Venture additional economic interest percentage to be sold + References No definition available. + Details
Name: | ctgo_ADDITIONALECONOMICINTERESTSELLABLE
Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contango Joint Venture Percentage + References No definition available. + Details
Name: | ctgo_ContangoJointVenturePercentage
Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition joint adventure economic interest + References No definition available. + Details
Name: | ctgo_Jointadventureeconomicinterest
Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition remaining shares to be vested + References No definition available. + Details
Name: | ctgo_Remainingsharestobevested
Namespace Prefix: | ctgo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition restricted stock issued shares + References No definition available. + Details
Name: | ctgo_Restrictedstockissuedshares
Namespace Prefix: | ctgo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition restricted stock issued shares DIRECTORS + References No definition available. + Details
Name: | ctgo_RestrictedstockissuedsharesDIRECTORS
Namespace Prefix: | ctgo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

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

X
- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration