Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements (Narrative) (Details)

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Financing Agreements (Narrative) (Details) - USD ($)
3 Months Ended
Sep. 12, 2014
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Schedule Of Financing Arrangements [Line Items]        
Liability on borrowed metals   $ 4,009,000   $ 9,500,000
Product financing obligation   50,030,000   $ 39,425,000
Line of Credit | Trading credit facility        
Schedule Of Financing Arrangements [Line Items]        
Interest expense, notes payable   $ 1,100,000 $ 900,000  
Percentage of total expense recognized   92.10% 87.80%  
Effective rate of interest   2.83% 3.06%  
Line of Credit | Trading credit facility | A-Mark | Trading credit facility        
Schedule Of Financing Arrangements [Line Items]        
Line of credit, maximum borrowing capacity   $ 205,000,000    
Variable rate basis   one-month LIBOR    
Credit facility, interest rate at period end   0.19%   0.19%
Borrowings due on demand   $ 176,900,000   $ 147,000,000
Credit facility, remaining borrowing capacity   $ 34,300,000    
Credit facility, minimum required tangible net worth $ 35,000,000