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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
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Jun. 30, 2018 USD ($)
Accounting Policies [Abstract] |
Concentration of credit risk uninsured cash amount | $ 0
Cash, Uninsured Amount, Description | We deposit our cash with financial institutions which we believe have sufficient credit quality to minimize the risk of loss

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- Definition Cash uninsured amount description. + References No definition available. + Details
Name: | pzg_CashUninsuredAmountDescription
Namespace Prefix: | pzg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Concentration of credit risk uninsured cash amount. + References No definition available. + Details
Name: | pzg_ConcentrationOfCreditRiskUninsuredCashAmount
Namespace Prefix: | pzg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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