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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 15, 2012 | Jul. 01, 2008 | Jul. 31, 2008 | Jun. 30, 2018
Tetlin Lease [Member] |  |  |  |
Inception-to-date Payments to Reduce Royalty Rate |  |  |  | $ 225,000
Decrease in Royalty Rates |  |  |  | 0.75%
Tetlin Lease [Member] | Scenario 1 [Member] |  |  |  |
Increase in Royalty Rates |  |  |  | 0.25%
Payment that Lessor May Pay to Lessee to Increase Royalty Rate |  |  |  | $ 150,000
Tetlin Lease [Member] | Scenario 2 [Member] |  |  |  |
Increase in Royalty Rates |  |  |  | 0.50%
Payment that Lessor May Pay to Lessee to Increase Royalty Rate |  |  |  | $ 300,000
Tetlin Lease [Member] | Scenario 3 [Member] |  |  |  |
Increase in Royalty Rates |  |  |  | 0.75%
Payment that Lessor May Pay to Lessee to Increase Royalty Rate |  |  |  | $ 450,000
Tetlin Lease [Member] | Minimum [Member] |  |  |  |
Advance Royalties to Be Paid Per Year | $ 75,000 |  |  | $ 50,000
Tetlin Lease [Member] | The Joint Venture Company [Member] |  |  |  |
Contractual Annual Exploration Costs |  |  | $ 350,000 |
Tetlin Lease [Member] | The Joint Venture Company [Member] | Minimum [Member] |  |  |  |
Royalty Rate |  |  | 2.00% | 1.25%
Tetlin Lease [Member] | The Joint Venture Company [Member] | Maximum [Member] |  |  |  |
Royalty Rate |  |  | 5.00% | 4.25%
Gold Properties [Member] |  |  |  |
Annual Claim Rentals |  |  |  | $ 155,505
Tetlin Lease and Certain Other Properties [Member] | The Joint Venture Company [Member] | Royal Gold [Member] |  |  |  |
Overriding Royalty Interest |  |  |  | 3.00%
Additional Properties [Member] | The Joint Venture Company [Member] | Royal Gold [Member] |  |  |  |
Overriding Royalty Interest |  |  |  | 2.00%
Native Village of Tetlin Land [Member] |  |  |  |
Initial Term of Leases and Concessions on Undeveloped Acreage |  |  | 10 years |
Extension of Term of Leases and Concessions on Undeveloped Acreage |  | 10 years |  |

X
- Definition Represents the amount of advance royalties to be paid per year. + References No definition available. + Details
Name: | ctgo_AdvanceRoyaltiesToBePaidPerYear
Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of annual claim rentals payable, as of the balance sheet date. + References No definition available. + Details
Name: | ctgo_AnnualClaimRentals
Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the contractual exploration costs to be paid per year, pursuant to the terms of the agreement. + References No definition available. + Details
Name: | ctgo_ContractualAnnualExplorationCosts
Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the reduction in the percentage of the royalty payable. + References No definition available. + Details
Name: | ctgo_DecreaseInRoyaltyRates
Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the extension of the term of leases and concessions on undeveloped acreage. + References No definition available. + Details
Name: | ctgo_ExtensionOfTermOfLeasesAndConcessionsOnUndevelopedAcreage
Namespace Prefix: | ctgo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the payments that have been made, inception-to-date, to reduce the royalty rate under an agreement. + References No definition available. + Details
Name: | ctgo_InceptionToDatePaymentsToReduceRoyaltyRate
Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents an increase in the percentage of the royalty payable. + References No definition available. + Details
Name: | ctgo_IncreaseInRoyaltyRates
Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the initial term of leases and concessions on undeveloped acreage. + References No definition available. + Details
Name: | ctgo_InitialTermOfLeasesAndConcessionsOnUndevelopedAcreage
Namespace Prefix: | ctgo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the overriding royalty interest the company would be required to pay if any of the properties are placed into commercial production. + References No definition available. + Details
Name: | ctgo_OverridingRoyaltyInterest
Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of payment that the lessor may make to the lessee in order to increase the royalty rate by a specified percentage. + References No definition available. + Details
Name: | ctgo_PaymentThatLessorMayPayToLesseeToIncreaseRoyaltyRate
Namespace Prefix: | ctgo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the royalty rate required to be paid under an agreement. + References No definition available. + Details
Name: | ctgo_RoyaltyRate
Namespace Prefix: | ctgo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=ctgo_TetlinLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=ctgo_Scenario1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=ctgo_Scenario2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=ctgo_Scenario3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ctgo_TheJointVentureCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=ctgo_GoldPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=ctgo_TetlinLeaseAndCertainOtherPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=ctgo_RoyalGoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=ctgo_AdditionalPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ctgo_NativeVillageOfTetlinLandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |