Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements (Subordinate Debt Financing) (Details)

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Financing Agreements (Subordinate Debt Financing) (Details) - USD ($)
3 Months Ended 6 Months Ended
Aug. 28, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Debt Instrument [Line Items]            
Other long-term liabilities (related party)   $ 1,103,000   $ 1,103,000   $ 1,117,000
Amortization of loan cost       595,000 $ 378,000  
Interest expense, notes payable   $ 200,000   $ 279,000    
Percentage of total expense recognized   6.00%   4.60%    
Effective rate of interest   9.29%   9.33%    
Goldline, LLC            
Debt Instrument [Line Items]            
Liabilities incurred for the acquisition $ 7,500,000          
Amortization of loan cost 200,000          
Debt issuance costs, net 500,000 $ 500,000   $ 500,000    
Borrowings due on demand   6,900,000   6,900,000    
Unamortized debt issuance expense   600,000   600,000    
Debt issuance costs, estimated, based on discounted cash flow model   300,000   300,000    
Goldline Lenders            
Debt Instrument [Line Items]            
Other long-term liabilities (related party)   $ 515,000   $ 515,000    
Affiliates | Goldline, LLC            
Debt Instrument [Line Items]            
Liabilities incurred for the acquisition 4,550,000          
Chief Executive Officer, Director and principal stockholder | Gregory N. Roberts | Goldline, LLC            
Debt Instrument [Line Items]            
Liabilities incurred for the acquisition 587,500          
Principal stockholder | William D. Richardson | Goldline, LLC            
Debt Instrument [Line Items]            
Liabilities incurred for the acquisition 587,500          
Chairman of the Board and Director | Jeffrey D. Benjamin | Goldline, LLC            
Debt Instrument [Line Items]            
Liabilities incurred for the acquisition 1,000,000          
Director | Ellis Landau | Goldline, LLC            
Debt Instrument [Line Items]            
Liabilities incurred for the acquisition 375,000          
Director | William Montgomery | Goldline, LLC            
Debt Instrument [Line Items]            
Liabilities incurred for the acquisition 1,500,000          
Director | Jess Ravich | Goldline, LLC            
Debt Instrument [Line Items]            
Liabilities incurred for the acquisition 500,000          
Non-affiliated members | Goldline, LLC            
Debt Instrument [Line Items]            
Liabilities incurred for the acquisition $ 2,950,000          
Silver Bow Ventures, LLC            
Debt Instrument [Line Items]            
Percentage of indebtedness   50.00%   50.00%    
Ownership percentage   50.00%   50.00%    
Loans Payable | Goldline, LLC            
Debt Instrument [Line Items]            
Stated interest rate (in percentage) 8.50%          
Debt instrument, additional interest, percentage of total principal (in percentage) 3.00%          
Debt instrument, additional interest, percentage of cumulative three year EBITDA (in percentage) 10.00%          
Debt instrument, additional interest, percentage of cumulative three year EBITDA, amount $ 10,000,000          
Debt instrument, term (years) 3 years          
Trading credit facility | Line of Credit            
Debt Instrument [Line Items]            
Interest expense, notes payable   $ 2,000,000 $ 1,600,000 $ 3,700,000 $ 3,000,000  
Percentage of total expense recognized   59.20% 63.50% 61.10% 64.20%  
Effective rate of interest   3.81% 3.36% 3.17% 3.78%  
Trading credit facility | Trading credit facility | Line of Credit | A-Mark            
Debt Instrument [Line Items]            
Line of Credit Facility, Covenants, Minimum Tangible Net Worth Required       $ 47,500,000    
Borrowings due on demand   $ 214,000,000   $ 214,000,000   $ 180,000,000