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COVID-19 Pandemic (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($)
COVID-19 Pandemic |
COVID-19 specific costs | $ 0.1

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- Definition The amount of COVID 19 Specific costs. + References No definition available. + Details
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Namespace Prefix: | goro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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