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Financing Agreements (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | |||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Jun. 30, 2013
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| Schedule Of Financing Arrangements [Line Items] | |||||
| Line of credit | $ 106,000,000 | $ 106,000,000 | $ 95,000,000 | ||
| Liability on borrowed metals | 11,226,000 | 11,226,000 | 20,117,000 | ||
| Obligation under product financing agreement | 25,506,000 | 25,506,000 | 38,554,000 | ||
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Stack Bowers Galleries | Debt obligations, note payable
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| Schedule Of Financing Arrangements [Line Items] | |||||
| Long-term debt | 2,700,000 | ||||
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Trading credit facility | A-Mark
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| Schedule Of Financing Arrangements [Line Items] | |||||
| Letters of credit outstanding | 0 | 0 | 9,000,000 | ||
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Trading credit facility | A-Mark | Line of credit
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| 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 | 0.17% | 0.17% | 0.19% | ||
| Borrowings due on demand | 106,000,000 | 106,000,000 | 95,000,000 | ||
| Credit facility, remaining borrowing capacity | 64,000,000 | 64,000,000 | 66,000,000 | ||
| Credit facility, minimum required tangible net worth | 25,000,000 | ||||
| Tangible Net Worth | 44,600,000 | 44,600,000 | |||
| Interest expense, notes payable | 900,000 | 900,000 | 1,900,000 | 1,900,000 | |
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Trading credit facility | Parent | Line of credit
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| Schedule Of Financing Arrangements [Line Items] | |||||
| Credit facility, minimum required tangible net worth | 50,000,000 | ||||
| Tangible Net Worth | 61,300,000 | 61,300,000 | |||
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Trading credit facility | Certain lender common to SNI and A-Mark | A-Mark | Line of credit
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| Schedule Of Financing Arrangements [Line Items] | |||||
| Line of credit, maximum borrowing capacity | 20,000,000 | 20,000,000 | |||
| Line of credit | 18,000,000 | 18,000,000 | |||
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Trading credit facility | Certain lender common to SNI and A-Mark | SNI and A-Mark | Line of credit
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| 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 | |||
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Collectibles credit facility | Certain lender common to SNI and A-Mark | SNI | Line of credit
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| Schedule Of Financing Arrangements [Line Items] | |||||
| Credit facility, remaining borrowing capacity | 0 | 0 | 0 | ||
| Line of credit | $ 5,000,000 | $ 5,000,000 | |||