Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements (Details)

v3.19.1
Financing Agreements (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
Mar. 31, 2016
Schedule Of Financing Arrangements [Line Items]            
Liability on borrowed metals $ 210,650,000   $ 210,650,000   $ 280,346,000  
Product financing obligation 65,723,000   65,723,000   113,940,000  
Line of Credit | Trading credit facility            
Schedule Of Financing Arrangements [Line Items]            
Interest expense, notes payable $ 2,000,000 $ 2,100,000 $ 5,900,000 $ 5,800,000    
Percentage of total expense recognized 47.60% 57.90% 47.50% 59.90%    
Effective rate of interest 4.89% 3.97% 4.73% 3.85%    
Line of Credit | Trading credit facility | A-Mark | Trading credit facility            
Schedule Of Financing Arrangements [Line Items]            
Line of credit, current borrowing capacity $ 260,000,000   $ 260,000,000     $ 210,000,000
Line of credit, accordion option           $ 50,000,000
Payments of financing costs     3,400,000      
Accumulated amortization of loan cost $ 700,000   $ 700,000   $ 500,000  
Variable rate basis     one-month LIBOR      
Credit facility, interest rate at period end 2.50%   2.50%   2.09%  
Borrowings due on demand $ 149,000,000   $ 149,000,000   $ 200,000,000  
Borrowings available $ 9,200,000   9,200,000   $ 22,100,000  
Line of credit facility, tangible net worth financial covenant     $ 47,500,000      
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%