A-Mark Precious Metals, Inc. Quarterly report pursuant to Section 13 or 15(d)

Secured Loans Receivable - Additional Information (Details)

v3.25.0.1

Secured Loans Receivable - Additional Information (Details)	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2024 USD ($) Loan	Dec. 31, 2024 USD ($) Loan	Jun. 30, 2024 USD ($) Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable average effective rate of interest (percentage)		10.40%	10.50%
Loan collateral values updated period frequency		90 days
Loans receivable payment terms for interest		180 days
Loan receivable liquidation period post default		20 days
Loans with loan-to-value	$ 98,461,000	$ 98,461,000	$ 113,067,000
Non-Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans \| Loan	0	0	0
Non-Accrual Status
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan impairment costs	$ 0	$ 0
Loan-to-value Ratio in Excess of 100%
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans with loan-to-value	$ 0	$ 0	$ 0
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan balance outstanding		85.00%
Bullion
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Loan-to-value ratio		75.00%
Graded Sports Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Loan-to-value ratio		50.00%
Numismatic and Semi-numismatic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Loan-to-value ratio		65.00%

- Definition

Finance Receivable, Number of Loans

+ References

No definition available.

+ Details

Name:	amrk_FinanceReceivableNumberofLoans
Namespace Prefix:	amrk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Loan collateral values updated period frequency

+ References

No definition available.

+ Details

Name:	amrk_LoanCollateralValuesUpdatedPeriodFrequency
Namespace Prefix:	amrk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Loan Receivable Liquidation Period Post Default

+ References

No definition available.

+ Details

Name:	amrk_LoanReceivableLiquidationPeriodPostDefault
Namespace Prefix:	amrk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Loans Receivable Average Effective Rate Of Interest

+ References

No definition available.

+ Details

Name:	amrk_LoansReceivableAverageEffectiveRateOfInterest
Namespace Prefix:	amrk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Loans Receivable Payment Terms For Interest

+ References

No definition available.

+ Details

Name:	amrk_LoansReceivablePaymentTermsForInterest
Namespace Prefix:	amrk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of excess loan balance outstanding.

+ References

No definition available.

+ Details

Name:	amrk_PercentageOfExcessLoanBalanceOutstanding
Namespace Prefix:	amrk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of loan-to-value ratio.

+ References

No definition available.

+ Details

Name:	amrk_PercentageOfLoanToValueRatio
Namespace Prefix:	amrk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amortized cost, after allowance for credit loss, of financing receivable classified as current. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

Name:	us-gaap_NotesAndLoansReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Name:	us-gaap_ProvisionForLoanLeaseAndOtherLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=amrk_NonAccrualStatusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanToValueAxis=amrk_LoanToValueInExcessOfHundredPercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnderlyingAssetClassAxis=amrk_BullionFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnderlyingAssetClassAxis=amrk_GradedSportsCardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnderlyingAssetClassAxis=amrk_NumismaticandSemiNumismaticMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: