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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