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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
	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: