Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Spin-off) (Details)

v2.4.0.8
Stockholders' Equity (Spin-off) (Details) (USD $)
0 Months Ended 3 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 19, 2014
Sep. 30, 2014
Mar. 14, 2014
SGI (Former Parent)
Mar. 19, 2014
SGI (Former Parent)
Mar. 17, 2014
SGI (Former Parent)
Mar. 19, 2014
SGI
Mar. 19, 2014
Awards assumed from SGI spin-off
Sep. 30, 2014
Awards assumed from SGI spin-off
Sep. 30, 2014
Restricted Stock Units (RSUs)
Mar. 19, 2014
Restricted Stock Units (RSUs)
Awards assumed from SGI spin-off
Mar. 19, 2014
Restricted Stock Units (RSUs)
Awards assumed from SGI spin-off
Sep. 30, 2014
Restricted Stock Units (RSUs)
Awards assumed from SGI spin-off
Mar. 19, 2014
Restricted Stock Units (RSUs)
Awards assumed from SGI spin-off
Issued to A-Mark Employees
Mar. 19, 2014
Stock Appreciation Rights (SARs)
Awards assumed from SGI spin-off
Mar. 19, 2014
Stock Appreciation Rights (SARs)
Awards assumed from SGI spin-off
Sep. 30, 2014
Stock Appreciation Rights (SARs)
Awards assumed from SGI spin-off
Mar. 19, 2014
Stock Appreciation Rights (SARs)
Awards assumed from SGI spin-off
Issued to A-Mark Employees
Sep. 30, 2014
Stock Options
Mar. 19, 2014
Stock Options
Awards assumed from SGI spin-off
Issued to A-Mark Employees
Class of Stock [Line Items]                                      
Exchange ratio based on average closing price for SGI shares 0.2397                                    
Three day weighted average share price before spin-off     $ 3.32                                
Share price     $ 3.37 $ 14.00 $ 13.30                            
Three day weighted average share price after spin-off           $ 13.85                          
Common stock exchange ratio   4.1717                                  
Grants during the period (shares)             249,846     130,646 130,646   50,340 8,990 8,990   8,990   216,943
Total compensation cost not yet recognized               $ 432,000                      
Total compensation cost not yet recognized, other than options                       $ 127,000       $ 0      
Period for recognition of nonvested awards                 1 year 4 months 30 days     1 year 4 months 30 days       0 days   3 years 26 days