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Subsequent Events Subsequent Events details (Details) - USD ($) $ / shares in Units, $ in Millions	2 Months Ended	3 Months Ended
	Nov. 15, 2016	Dec. 31, 2016	Mar. 31, 2013	Sep. 30, 2016	Jun. 30, 2016
Subsequent Event [Line Items]
Common stock, par value				$ 0.01	$ 0.01
Investment Warrants, Exercise Price	$ 9.00		$ 10.00
WarrantsExercised		241,667
Proceeds from Warrant Exercises		$ 2.2
Juneau Exploration LLC [Member]
Subsequent Event [Line Items]
WarrantsExercised		83,334

X

- Definition

Warrants Exercised

+ References

No definition available.

+ Details

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Namespace Prefix:	ctgo_
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Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price of the warrants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column A

+ Details

Name:	invest_InvestmentWarrantsExercisePrice
Namespace Prefix:	invest_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

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X

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

No definition available.

+ Details

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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