Cash distributions received.

No definition available.

Name:	ctgo_CashDistributionsReceived
Namespace Prefix:	ctgo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the amount of the exploration budget that has been funded as of the specified date.

+ References

No definition available.

+ Details

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Namespace Prefix:	ctgo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Exploration budget funded amount for next fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	ctgo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

FairValueOfCurrentMaturitiesOfHedges.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Schedule of liquidity.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Working capital deficit.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of increase (decrease) in cash and cash equivalent, and cash and cash equivalent restricted to withdrawal or usage; including effect from exchange rate change and including, but not limited to, discontinued operation. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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-Section S99
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-Subparagraph (SX 210.5-02(22)(a)(2))
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-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Balance Type:	na
Period Type:	duration

- Definition

Amount of cash inflow (outflow) from operating activity, including, but not limited to, discontinued operation. Operating activity includes, but is not limited to, transaction, adjustment, and change in value not defined as investing or financing activity.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

+ Details

Name:	us-gaap_RepaymentsOfSecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

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- Details

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Note 3 - Liquidity (Details Textual) - USD ($)			1 Months Ended	12 Months Ended
Note 3 - Liquidity (Details Textual) - USD ($)	Jan. 01, 2026	Feb. 18, 2025	Jul. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Schedule Of Liquidity [Line Items]
Principal payments		$ 10,600,000		$ 37,500,000	$ 7,900,000
Maturity date, description				maturities ranging between March and September 2026
Working capital deficit				$ 8,000,000
Fair value of current maturities of hedges				66,500,000
Cash from operating activities				25,734,054	698,987
Cash				44,628,460	4,578,131
ATM Offering [Member]
Schedule Of Liquidity [Line Items]
Capital raises for net proceeds				9,600,000
Underwriting Offering [Member]
Schedule Of Liquidity [Line Items]
Capital raises for net proceeds				47,000,000
Subsequent Event [Member] \| Underwriting Offering [Member]
Schedule Of Liquidity [Line Items]
Capital raises for net proceeds	$ 47,200,000
The Joint Venture Company [Member]
Schedule Of Liquidity [Line Items]
Exploration Budget, Funded Amount				78,600,000	78,600,000
Exploration budget funded amount for next fiscal year				0
Cash distributions received			$ 142,500,000	102,000,000	40,500,000
Repayment obligations on the facility				4,000,000
Principal payments				$ 37,500,000	$ 7,900,000