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Gold and Silver Bullion (Details) - oz | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Gold |  |
Schedule Of Investments [Line Items] |  |
Purchases of bullion | 0 | 151.55

X
- Definition Purchase of physical commodities weight. + References No definition available. + Details
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Namespace Prefix: | goro_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

X
- Details
Name: | invest_InvestmentAxis=goro_GoldBullionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |