Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Jun. 30, 2017
Sep. 08, 2017
Dec. 31, 2016
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 Smaller Reporting Company    
Document Type 10-K    
Document Period End Date Jun. 30, 2017    
Document Fiscal Year Focus 2017    
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   7,031,450  
Entity Public Float     $ 73,530,678