Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements (Narrative) (Details)

v3.3.1.900
Financing Agreements (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2015
Schedule Of Financing Arrangements [Line Items]          
Liability on borrowed metals $ 4,234,000   $ 4,234,000   $ 9,500,000
Product financing obligation 50,504,000   50,504,000   $ 39,425,000
Line of Credit | Trading credit facility          
Schedule Of Financing Arrangements [Line Items]          
Interest expense, notes payable $ 1,100,000 $ 800,000 $ 2,300,000 $ 1,800,000  
Percentage of total expense recognized 86.90% 87.50% 89.40% 87.60%  
Effective rate of interest (percentage) 2.72% 2.94% 2.77% 3.00%  
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   $ 205,000,000    
Variable rate basis     one-month LIBOR    
Credit facility, interest rate at period end (percentage) 0.43%   0.43%   0.19%
Borrowings due on demand $ 162,500,000   $ 162,500,000   $ 147,000,000
Credit facility, remaining borrowing capacity $ 32,200,000   32,200,000   $ 20,900,000
Credit facility, minimum required tangible net worth     $ 35,000,000