The equity interest of other holders in equity method investment.

No definition available.

Name:	ctgo_EquityMethodInvestmentOwnershipPercentageByOtherOwner
Namespace Prefix:	ctgo_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

+ Details

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Note 1 - Organization and Business (Details Textual) - a	Mar. 31, 2026	May 17, 2023
State of Alaska from Cook Inlet Region Inc. [Member] \| Johnson Tract Project [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	21,000
Lucky Shot Alaska, LLC [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	8,600
Contango Minerals [Member] \| State of Alaska Mining Claims Located North and Northwest of Tetlin Lease [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	145,330
Contango Minerals [Member] \| State of Alaska Mining Claims Located Near Eagle/Hona Property [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	69,780
Contango Minerals [Member] \| State of Alaska Mining Claims Located Near Triple Z Property [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	14,850
Contango Minerals [Member] \| State of Alaska Mining Claims Located in Richardson District [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	52,700
Contango Minerals [Member] \| State of Alaska Mining Claims Located Near Lucky Shot Property [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	8,000
Avidian Gold Alaska Inc. [Member] \| State of Alaska Mining Claims and Leases [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	15,260
Avidian Gold Alaska Inc. [Member] \| Near Fort Knox Gold Mine [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	1,030
Avidian Gold Alaska Inc. [Member] \| Valdez Creek Mining District [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	10,850
Avidian Gold Alaska Inc. [Member] \| Near Fort Knox [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	3,380
Dolly Varden Silver Corporation [Member] \| Kitsault Valley Project [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	247,105
Peak Gold, LLC [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Equity Method Investment, Ownership Percentage	30.00%	30.00%
The Joint Venture Company [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Equity Method Investment, Ownership Percentage	30.00%
The Joint Venture Company [Member] \| KG Mining [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Equity Method Investment, Ownership Percentage by Other Owner	70.00%
The Joint Venture Company [Member] \| State of Alaska Mining Claims for Exploration and Development [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	13,000
The Joint Venture Company [Member] \| Tetlin Lease [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Area of Land (Acre)	675,000
HighGold Mining Inc. [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Equity Method Investment, Ownership Percentage	100.00%
CORE Alaska, LLC [Member] \| Peak Gold, LLC [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Equity Method Investment, Ownership Percentage	30.00%