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

Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Options Outstanding, Range of Exercise Prices and Other Details) (Details)

Stockholders' Equity (Options Outstanding, Range of Exercise Prices and Other Details) (Details) (USD $)	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options, Number of Shares Outstanding	230,787	0
Stock options outstanding, Weighted Average Remaining Contractual Life (years)	8 years 3 months 7 days
Stock options outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.00	$ 0.00
Stock options, Number of Shares Exercisable	134,902
Stock options exercisable, Weighted Average Remaining Contractual Life (years)	8 years 2 months 23 days
Stock options exercisable, Weighted Average Exercise Price (in dollars per share)	$ 11.18
Price Range $0 - $10.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options, Exercise Price Ranges, lower range limit	$ 0.00
Stock options, Exercise Price Ranges, upper range limit	$ 10.00
Stock options, Number of Shares Outstanding	134,239
Stock options outstanding, Weighted Average Remaining Contractual Life (years)	8 years 4 months 10 days
Stock options outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.39
Stock options, Number of Shares Exercisable	38,354
Stock options exercisable, Weighted Average Remaining Contractual Life (years)	8 years 5 months 5 days
Stock options exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.50
Price Range $10.01 - $15.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options, Exercise Price Ranges, lower range limit	$ 10.01
Stock options, Exercise Price Ranges, upper range limit	$ 15.00
Stock options, Number of Shares Outstanding	95,888
Stock options outstanding, Weighted Average Remaining Contractual Life (years)	8 years 2 months 16 days
Stock options outstanding, Weighted Average Exercise Price (in dollars per share)	$ 12.00
Stock options, Number of Shares Exercisable	95,888
Stock options exercisable, Weighted Average Remaining Contractual Life (years)	8 years 2 months 16 days
Stock options exercisable, Weighted Average Exercise Price (in dollars per share)	$ 12.00
Price Range $15.01 - $50.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options, Exercise Price Ranges, lower range limit	$ 15.01
Stock options, Exercise Price Ranges, upper range limit	$ 50.00
Stock options, Number of Shares Outstanding	660
Stock options outstanding, Weighted Average Remaining Contractual Life (years)	1 month 6 days
Stock options outstanding, Weighted Average Exercise Price (in dollars per share)	$ 48.02
Stock options, Number of Shares Exercisable	660
Stock options exercisable, Weighted Average Remaining Contractual Life (years)	1 month 6 days
Stock options exercisable, Weighted Average Exercise Price (in dollars per share)	$ 48.02