Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements (Narrative) (Details)

v3.4.0.3
Financing Agreements (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Jun. 30, 2015
Schedule Of Financing Arrangements [Line Items]          
Liability on borrowed metals $ 5,573,000   $ 5,573,000   $ 9,500,000
Product financing obligation 93,168,000   93,168,000   $ 39,425,000
Line of Credit | Trading credit facility          
Schedule Of Financing Arrangements [Line Items]          
Interest expense, notes payable $ 1,300,000 $ 900,000 $ 3,600,000 $ 2,700,000  
Percentage of total expense recognized 76.70% 80.80% 84.40% 85.20%  
Effective rate of interest (percentage) 2.82% 2.82% 2.79% 2.94%  
Line of Credit | Trading credit facility | A-Mark | Trading credit facility          
Schedule Of Financing Arrangements [Line Items]          
Line of credit, maximum borrowing capacity $ 275,000,000   $ 275,000,000    
Line of credit, current borrowing capacity 225,000,000   225,000,000    
Line of credit, accordion option $ 50,000,000   $ 50,000,000    
Variable rate basis     one-month LIBOR    
Credit facility, interest rate at period end (percentage) 0.44%   0.44%   0.19%
Borrowings due on demand $ 190,000,000   $ 190,000,000   $ 147,000,000
Credit facility, remaining borrowing capacity $ 28,800,000   28,800,000   $ 20,900,000
Credit facility, minimum required tangible net worth     $ 35,000,000    
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit | Revolving Credit Facility [Member]          
Schedule Of Financing Arrangements [Line Items]          
Debt Instrument, Basis Spread on Variable Rate     2.50%    
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit | Bridge Loan [Member]          
Schedule Of Financing Arrangements [Line Items]          
Debt Instrument, Basis Spread on Variable Rate     4.50%