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

Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions (Details)

Related Party Transactions (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended		0 Months Ended
Related Party Transactions (Details) (USD $)	Mar. 20, 2015	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Feb. 12, 2014	Jul. 02, 2013	Jan. 23, 2015	Jul. 02, 2014	Jun. 30, 2014	Jun. 18, 2014	Jun. 05, 2014	Feb. 28, 2015	Oct. 09, 2014
Related Party Transaction [Line Items]
Sales		$ 2,365,000amrk_SaleofInventoryofRelatedParty	$ 4,167,000amrk_SaleofInventoryofRelatedParty	$ 5,447,000amrk_SaleofInventoryofRelatedParty	$ 12,604,000amrk_SaleofInventoryofRelatedParty
Purchases		1,740,000amrk_PurchasesOfInventoryRelatedParty	2,247,000amrk_PurchasesOfInventoryRelatedParty	8,278,000amrk_PurchasesOfInventoryRelatedParty	8,996,000amrk_PurchasesOfInventoryRelatedParty
Receivable		6,163,000us-gaap_DueFromRelatedParties		6,163,000us-gaap_DueFromRelatedParties						5,852,000us-gaap_DueFromRelatedParties
Payables		10,000		10,000						272,000
Short term loan receivable								3,100,000	3,700,000		2,600,000	3,800,000
Income taxes receivable from Former Parent		4,017,000us-gaap_DueFromRelatedPartiesCurrent		4,017,000us-gaap_DueFromRelatedPartiesCurrent						3,139,000us-gaap_DueFromRelatedPartiesCurrent
Dividends paid to SGI	300,000us-gaap_DividendsCommonStockCash
Calzona
Related Party Transaction [Line Items]
Sales		0	1,060,000	157,000	3,409,000
Purchases		0	110,000	0	464,000
Receivable		0		0						0
Payables		0		0						67,000
SNI
Related Party Transaction [Line Items]
Sales		0	1,802,000	610,000	5,589,000
Purchases		0	1,644,000	3,793,000	3,904,000
Receivable		0		0						0
Payables		10,000		10,000						72,000
Stack Bowers Galleries
Related Party Transaction [Line Items]
Sales		1,618,000	541,000	2,918,000	1,743,000
Purchases		1,679,000	305,000	3,146,000	2,955,000
Receivable		2,052,000		2,052,000						2,563,000
Payables		0		0						0
Short term loan receivable		0		0						2,600,000	2,600,000
Rate of interest (percentage)											5.50%
Teletrade (now doing business as Stack's Bowers)
Related Party Transaction [Line Items]
Sales		747,000	764,000	1,762,000	1,863,000
Purchases		61,000	188,000	1,339,000	1,673,000
Receivable		19,000		19,000						0
Payables		0		0						133,000
SGI (Former Parent)
Related Party Transaction [Line Items]
Receivable		4,092,000		4,092,000						3,289,000
Payables		0		0						0
Corporate overhead charges payable to SNI				0	500,000
Dividends paid to SGI				0	10,000,000	5,000,000	5,000,000
W.A.Richardson Builders, LLC (WAR) [Member]
Related Party Transaction [Line Items]
Contractual obligation													1,200,000
Fees payable, percentage													5.00%
Fees payable, amount													100,000
Former owner
Related Party Transaction [Line Items]
Payment related to royalty agreement with former owner		200,000	200,000
Royalty expense				100,000	0
Royalty expense accrued		200,000		200,000						200,000
Line of Credit [Member] \| Stack Bowers Galleries
Related Party Transaction [Line Items]
Short term loan receivable		2,000,000		2,000,000
Line of credit, maximum borrowing capacity														$ 16,000,000.0