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Note 4 - Prepaid Expenses and Other | 12 Months Ended
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Jun. 30, 2018
Notes to Financial Statements |
Prepaid Expenses [Text Block] | 4. Prepaid Expenses and Other The Company had prepaid expenses and other assets of $155,671 and $175,791 as of June 30, 2018 and 2017 , respectively, related primarily to prepaid management fees and insurance costs.

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- Definition The complete disclosure for prepaid expenses. + References No definition available. + Details
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Namespace Prefix: | ctgo_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DisclosureTextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration