Income Taxes - Schedule of Reconciliation of the Provision for Income Taxes (Parentheticals) (Details)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Tax expense (benefit) at U.S. rate	21.00%	21.00%

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

No definition available.

Name:	aumn_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxPercent
Namespace Prefix:	aumn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration