Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements (Details)

v3.6.0.2
Financing Agreements (Details) - USD ($)
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Mar. 31, 2016
Schedule Of Financing Arrangements [Line Items]            
Liability on borrowed metals $ 3,471,000   $ 3,471,000   $ 4,352,000  
Product financing obligation 121,466,000   121,466,000   59,358,000  
Line of Credit | Trading credit facility            
Schedule Of Financing Arrangements [Line Items]            
Interest expense, notes payable $ 1,600,000 $ 1,100,000 $ 3,000,000 $ 2,300,000    
Percentage of total expense recognized 63.50% 86.90% 64.20% 89.40%    
Effective rate of interest 3.36% 2.72% 3.17% 2.77%    
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
Line of credit, current borrowing capacity           225,000,000
Line of credit, accordion option           $ 50,000,000
Payments of financing costs     $ 900,000      
Accumulated amortization of loan cost $ 300,000   $ 300,000   $ 600,000  
Variable rate basis     one-month LIBOR      
Credit facility, interest rate at period end 0.77%   0.77%   0.47%  
Borrowings due on demand $ 185,000,000   $ 185,000,000   $ 212,000,000  
Credit facility, remaining borrowing capacity $ 81,400,000   81,400,000   $ 17,800,000  
Credit facility, minimum required tangible net worth     $ 38,900,000      
LIBOR | Line of Credit | Revolving Credit Facility            
Schedule Of Financing Arrangements [Line Items]            
Variable rate     2.50%      
LIBOR | Line of Credit | Bridge Loan            
Schedule Of Financing Arrangements [Line Items]            
Variable rate     4.50%