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ACCOUNTING POLICIES (Details 3) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Depreciation and amortization              
Total depreciation and amortization, including internal-use software and website development $ 5,838,000 $ 4,310,000 $ 11,214,000 $ 8,105,000 $ 21,173,000   $ 15,101,000
Additional Disclosure              
Cost Method Investments, Original Cost 7,000,000   7,000,000   7,000,000    
Cost-method Investments 7,000,000   7,000,000   7,000,000    
Cost-method Investments, Other than Temporary Impairment     0 0      
Precious Metals [Abstract]              
Precious metals 10,853,000   10,853,000   10,853,000 $ 10,905,000  
Unrealized loss on investment in precious metals $ (52,000)   (52,000) 0 $ (1,321,000)   $ (1,075,000)
Goodwill              
Impairments of goodwill     0     0  
Impairments of long-lived assets     $ 0     $ 0  
Registered Broker Dealer              
Additional Disclosure              
Equity Method Investment, Ownership Percentage           24.90%  
Equity Method Investment, Aggregate Cost           $ 250,000  
Noncontrolling Interest, Ownership Percentage by Parent 75.10%   75.10%   75.10%    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 24.90%   24.90%   24.90%    
Gold              
Precious Metals [Abstract]              
Precious metals $ 6,300,000   $ 6,300,000   $ 6,300,000 6,300,000  
Silver              
Precious Metals [Abstract]              
Precious metals 4,600,000   4,600,000   4,600,000 4,600,000  
Cryptocurrency, Bitcoin              
Goodwill              
Other current assets 249,000   249,000   $ 249,000 $ 340,000  
Gain (Loss) on Cryptocurrency Holdings     (106,000) 0      
Cost of goods sold — direct              
Depreciation and amortization              
Total depreciation and amortization, including internal-use software and website development 68,000 69,000 133,000 157,000      
Technology              
Depreciation and amortization              
Total depreciation and amortization, including internal-use software and website development 5,457,000 3,959,000 10,456,000 7,395,000      
General and administrative              
Depreciation and amortization              
Total depreciation and amortization, including internal-use software and website development 313,000 282,000 $ 625,000 553,000      
Computer software | Minimum              
Fixed assets              
Life     2 years        
Computer software | Maximum              
Fixed assets              
Life     4 years        
Computer hardware | Minimum              
Fixed assets              
Life     3 years        
Computer hardware | Maximum              
Fixed assets              
Life     4 years        
Furniture and equipment | Minimum              
Fixed assets              
Life     3 years        
Furniture and equipment | Maximum              
Fixed assets              
Life     5 years        
Internal-use software and website development              
Additional Disclosure              
Capitalized costs 5,400,000 3,000,000 $ 9,400,000 7,000,000      
Amortization of capitalized costs $ 3,700,000 $ 2,500,000 $ 6,900,000 $ 4,800,000      
Internal-use software and website development | Minimum              
Fixed assets              
Life     2 years        
Internal-use software and website development | Maximum              
Fixed assets              
Life     3 years