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Stock Based Compensation Allocation of Recognized Period Costs (Details) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 263,454us-gaap_AllocatedShareBasedCompensationExpense	$ 192,576us-gaap_AllocatedShareBasedCompensationExpense	$ 640,731us-gaap_AllocatedShareBasedCompensationExpense	$ 986,317us-gaap_AllocatedShareBasedCompensationExpense
Exploration expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	136,429us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = ctgo_ExplorationExpensesMember	69,625us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = ctgo_ExplorationExpensesMember	241,663us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = ctgo_ExplorationExpensesMember	296,571us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = ctgo_ExplorationExpensesMember
Stock-based compensation expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 127,025us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = ctgo_StockBasedCompensationExpenseMember	$ 122,951us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = ctgo_StockBasedCompensationExpenseMember	$ 399,068us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = ctgo_StockBasedCompensationExpenseMember	$ 689,746us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = ctgo_StockBasedCompensationExpenseMember

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

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

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- Details

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

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=ctgo_ExplorationExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=ctgo_StockBasedCompensationExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: