Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information (USD $)
12 Months Ended
Jun. 30, 2014
Sep. 25, 2014
Dec. 31, 2013
Document and Entity Information [Abstract]      
Entity Registrant Name A-Mark Precious Metals, Inc.    
Entity Central Index Key 0001591588    
Trading Symbol AMRK    
Current Fiscal Year End Date --06-30    
Entity Filer Category Non-accelerated Filer    
Document Type 10-K    
Document Period End Date Jun. 30, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer No    
Entity Volunteer Filers No    
Entity Current Reporting Status Yes    
Entity Common Stock, Shares Outstanding   6,962,742  
Entity Public Float     $ 0