Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions (Details)

v3.10.0.1
Related Party Transactions (Details) - USD ($)
 3 Months Ended
Aug. 28, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Mar. 01, 2018
Sep. 19, 2017
Related Party Transaction [Line Items]            
Receivable   $ 6,226,000   $ 13,240,000    
Payables   9,309,000   8,872,000    
Sales   122,177,000 $ 89,553,000      
Purchases   19,595,000 2,846,000      
Income (loss) from equity method investment   248,000 57,000      
Equity method investment   8,136,000   7,888,000    
March 1, 2018 Loan Agreement            
Related Party Transaction [Line Items]            
Maximum borrowing capacity available         $ 10,000,000  
Participation interest, percentage of net profits realized on sale         10.00%  
Former Parent            
Related Party Transaction [Line Items]            
Receivable   6,226,000   13,240,000    
Payables   0   0    
Sales   17,475,000 4,432,000      
Purchases   16,772,000 2,389,000      
Former Parent | September 19, 2017 Loan Agreement            
Related Party Transaction [Line Items]            
Maximum borrowing capacity available           $ 5,300,000
Short term loan receivable   3,700,000   3,000,000    
Former Parent | March 1, 2018 Loan Agreement            
Related Party Transaction [Line Items]            
Short term loan receivable   2,000,000   9,500,000    
Equity method investee            
Related Party Transaction [Line Items]            
Receivable   0   0    
Payables   1,265,000   920,000    
Sales   100,564,000 81,971,000      
Purchases   2,362,000 358,000      
SilverTowne            
Related Party Transaction [Line Items]            
Receivable   0   0    
Payables   332,000   242,000    
Accounts receivable   300,000        
Accrued liabilities   600,000        
Sales   4,138,000 3,150,000      
Purchases   461,000 99,000      
Goldline Lenders            
Related Party Transaction [Line Items]            
Receivable   0   0    
Payables   7,712,000   7,710,000    
Debt instrument, face amount   7,500,000.0        
Other long-term liabilities (related party)   200,000        
Affiliated entities            
Related Party Transaction [Line Items]            
Interest income   1,937,000 546,000      
Interest expense   195,000 75,000      
Affiliated entities | Interest Income from Secured Loans Receivable            
Related Party Transaction [Line Items]            
Interest income   214,000 2,000      
Affiliated entities | Interest Income from Finance Products            
Related Party Transaction [Line Items]            
Interest income   1,723,000 544,000      
Affiliated entities | Interest expense incurred related to notes payable            
Related Party Transaction [Line Items]            
Interest expense   0 2,000      
Affiliated entities | Interest expense incurred related to long-term debt obligation            
Related Party Transaction [Line Items]            
Interest expense   195,000 $ 73,000      
Goldline, LLC            
Related Party Transaction [Line Items]            
Borrowings due on demand   7,300,000   7,200,000    
Liabilities incurred for the acquisition $ 7,500,000          
Unamortized debt issuance expense   243,000   $ 274,000    
Debt issuance costs, net   $ 212,000