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Note 5 - Loss Per Share (Details Textual) - shares	Jun. 30, 2018	Jun. 30, 2017
Options and Warrants Outstanding	35,625	845,999

X

- Definition

Represents the number of options and warrants to purchase common stock, as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	ctgo_OptionsAndWarrantsOutstanding
Namespace Prefix:	ctgo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant