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Financing Agreements (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | |||
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Mar. 31, 2014
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Mar. 31, 2013
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Mar. 31, 2014
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Mar. 31, 2013
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Jun. 30, 2013
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| 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 | ||
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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 | 0.15% | 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 | |
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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 | 15,500,000 | 15,500,000 | |||
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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 | |||
| Line of credit | $ 7,500,000 | $ 7,500,000 | |||