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 3 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2014
Sep. 12, 2014
Sixth Participant
Line of credit
Sep. 30, 2014
Trading credit facility
Jun. 30, 2014
Trading credit facility
Sep. 30, 2014
Trading credit facility
Line of credit
Sep. 30, 2013
Trading credit facility
Line of credit
Sep. 12, 2014
Trading credit facility
A-Mark
Line of credit
Sep. 30, 2014
Trading credit facility
A-Mark
Line of credit
Jun. 30, 2014
Trading credit facility
A-Mark
Line of credit
Sep. 30, 2014
Trading credit facility
Certain lender common to SNI and A-Mark
A-Mark
Line of credit
Sep. 30, 2014
Trading credit facility
Certain lender common to SNI and A-Mark
SNI and A-Mark
Line of credit
Mar. 31, 2014
Trading credit facility
Certain lender common to SNI and A-Mark
SNI and A-Mark
Line of credit
Mar. 31, 2014
Trading credit facility
Certain lender common to SNI and A-Mark
SNI
Line of credit
Sep. 30, 2014
Collectibles credit facility
Certain lender common to SNI and A-Mark
SNI
Line of credit
Schedule Of Financing Arrangements [Line Items]                                
Line of credit, maximum borrowing capacity       $ 50,000,000.0           $ 220,000,000   $ 20,000,000   $ 23,000,000 $ 5,000,000  
Variable rate basis                   one-month LIBOR            
Credit facility, interest rate at period end                   0.15% 0.15%          
Borrowings due on demand                   128,000,000 135,200,000          
Letters of credit outstanding         0 0                    
Credit facility, remaining borrowing capacity                   34,700,000 14,400,000         2,000,000
Credit facility, minimum required tangible net worth                 35,000,000   25,000,000          
Tangible net worth                   42,400,000            
Line of credit 128,000,000   135,200,000                 18,000,000 21,000,000     3,000,000
Interest expense, notes payable             900,000 800,000                
Percentage of total expense recognized 87.80% 82.50%                            
Effective rate of interest 3.06% 3.19%                            
Liability on borrowed metals 11,998,000   8,709,000                          
Product financing obligation $ 20,613,000   $ 24,610,000