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 9 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Jun. 30, 2013
Schedule Of Financing Arrangements [Line Items]          
Line of credit $ 119,800,000   $ 119,800,000   $ 95,000,000
Liability on borrowed metals 8,620,000   8,620,000   20,117,000
Product financing obligation 49,684,000   49,684,000   38,554,000
Stack Bowers Galleries | Debt obligations, note payable
         
Schedule Of Financing Arrangements [Line Items]          
Long-term debt         2,700,000
Trading credit facility | A-Mark
         
Schedule Of Financing Arrangements [Line Items]          
Letters of credit outstanding 0   0   9,000,000
Trading credit facility | A-Mark | Line of credit
         
Schedule Of Financing Arrangements [Line Items]          
Line of credit, maximum borrowing capacity 170,000,000   170,000,000    
Variable rate basis     one-month LIBOR    
Credit facility, interest rate at period end 0.15%   0.15%   0.19%
Borrowings due on demand 119,800,000   119,800,000   95,000,000
Credit facility, remaining borrowing capacity 50,200,000   50,200,000   66,000,000
Credit facility, minimum required tangible net worth     25,000,000    
Tangible Net Worth 39,200,000   39,200,000    
Interest expense, notes payable 1,000,000 800,000 2,900,000 2,600,000  
Trading credit facility | Certain lender common to SNI and A-Mark | A-Mark | Line of credit
         
Schedule Of Financing Arrangements [Line Items]          
Line of credit, maximum borrowing capacity 20,000,000   20,000,000    
Line of credit 15,500,000   15,500,000    
Trading credit facility | Certain lender common to SNI and A-Mark | SNI and A-Mark | Line of credit
         
Schedule Of Financing Arrangements [Line Items]          
Line of credit, maximum borrowing capacity 23,000,000   23,000,000    
Line of credit 23,000,000   23,000,000    
Collectibles credit facility | Certain lender common to SNI and A-Mark | SNI | Line of credit
         
Schedule Of Financing Arrangements [Line Items]          
Credit facility, remaining borrowing capacity 0   0    
Line of credit $ 7,500,000   $ 7,500,000