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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_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	invest_InvestmentAxis=goro_GoldBullionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: