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Stockholders' Equity (Spin-off) (Details) (USD $)
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0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 19, 2014
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Jun. 04, 2014
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Jun. 30, 2014
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Mar. 17, 2014
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Jun. 30, 2013
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Mar. 14, 2014
SGI (Former Parent)
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Mar. 19, 2014
SGI (Former Parent)
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Mar. 17, 2014
SGI (Former Parent)
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Mar. 19, 2014
SGI
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Mar. 19, 2014
Awards assumed from SGI spin-off
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Jun. 30, 2014
Restricted Stock Units (RSUs)
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Mar. 19, 2014
Restricted Stock Units (RSUs)
Awards assumed from SGI spin-off
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Mar. 19, 2014
Restricted Stock Units (RSUs)
Awards assumed from SGI spin-off
Issued to A-Mark Employees
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Jun. 30, 2014
Stock Appreciation Rights (SARs)
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Mar. 19, 2014
Stock Appreciation Rights (SARs)
Awards assumed from SGI spin-off
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Mar. 19, 2014
Stock Appreciation Rights (SARs)
Awards assumed from SGI spin-off
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Mar. 19, 2014
Stock Appreciation Rights (SARs)
Awards assumed from SGI spin-off
Issued to A-Mark Employees
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Jun. 30, 2014
Stock Options
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Mar. 19, 2014
Stock Options
Awards assumed from SGI spin-off
Issued to A-Mark Employees
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| Class of Stock [Line Items] | |||||||||||||||||||
| Common stock, shares outstanding | 6,962,742 | 7,402,664 | 7,402,664 | ||||||||||||||||
| Interest rate at second closing | 4.00% | ||||||||||||||||||
| Exchange ratio based on average closing price for SGI shares | 0.2397 | ||||||||||||||||||
| Three day weighted average share price before spin-off | $ 3.32 | ||||||||||||||||||
| Three day weighted average share price after spin-off | $ 13.85 | ||||||||||||||||||
| Common stock exchange ratio | 4.1717 | ||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 249,846 | 130,646 | 50,340 | 8,990 | 8,990 | 8,990 | 216,943 | ||||||||||||
| Share price | $ 3.37 | $ 14.00 | $ 13.30 | ||||||||||||||||
| Total compensation cost not yet recognized, other than options | $ 149,000 | $ 0 | |||||||||||||||||
| Period for recognition of nonvested awards | 1 year 7 months 24 days | 0 days | 3 years 3 months 27 days | ||||||||||||||||
| Total compensation cost not yet recognized | $ 472,000 | ||||||||||||||||||