Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Spin-off) (Details)

v2.4.0.8
Stockholders' Equity (Spin-off) (Details) (USD $)
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
Mar. 19, 2014
Jun. 04, 2014
Jun. 30, 2014
Mar. 17, 2014
Jun. 30, 2013
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
Jun. 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
Issued to A-Mark Employees
Jun. 30, 2014
Stock Appreciation Rights (SARs)
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
Mar. 19, 2014
Stock Appreciation Rights (SARs)
Awards assumed from SGI spin-off
Issued to A-Mark Employees
Jun. 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]                                      
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