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Note 15 - Derivatives and Hedging Activities - Derivatives Not Designated as Hedging (Details) - Not Designated as Hedging Instrument [Member] | 12 Months Ended
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Dec. 31, 2024 oz $ / oz
Derivatives, Fair Value [Line Items] |
Volume (Ounce) | 86,739
Commodity Contract 2025 [Member] |
Derivatives, Fair Value [Line Items] |
Volume (Ounce) | 45,639
Weighted average price (in USD per Ounce) | $ / oz | 2,025.17
Commodity Contract 2026 [Member] |
Derivatives, Fair Value [Line Items] |
Volume (Ounce) | 41,100
Weighted average price (in USD per Ounce) | $ / oz | 2,025.17

X
- Definition Nominal mass used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountMass
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in mass but not the derivative contract itself. + References No definition available. + Details
Name: | us-gaap_UnderlyingDerivativeMass
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=ctgo_CommodityContract2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=ctgo_CommodityContract2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |