Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions (Details)

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Related Party Transactions (Details)
3 Months Ended 6 Months Ended
Dec. 07, 2018
USD ($)
Dec. 31, 2019
USD ($)
loan
investment
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
loan
investment
Dec. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
Mar. 01, 2018
USD ($)
Sep. 19, 2017
USD ($)
Related Party Transaction [Line Items]                
Number of investments | investment   3   3        
Receivables   $ 11,588,000   $ 11,588,000   $ 22,849,000    
Payables   728,000   728,000   163,000    
Receivables, net   24,598,000   24,598,000   26,895,000    
Carrying Value   11,999,000   11,999,000   11,885,000    
Sales   138,253,000 $ 149,045,000 251,804,000 $ 303,256,000      
Purchases   10,792,000 4,277,000 42,971,000 24,984,000      
Interest income   47,000 24,000 89,000 24,000      
Income (loss) from equity method investment   102,000 311,000 114,000 559,000      
Revaluation adjustment       0 504,000      
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%  
Goldline, LLC                
Related Party Transaction [Line Items]                
Liabilities incurred for the acquisition $ 7,500,000              
Debt Instrument, Fee Amount   157,000   157,000        
Stack's Bowers Galleries                
Related Party Transaction [Line Items]                
Receivables   9,279,000   9,279,000   17,630,000    
Payables   $ 0   $ 0   0    
Number of credit lines | loan   2   2        
Receivables, net   $ 400,000   $ 400,000        
Sales   7,764,000 1,613,000 18,765,000 19,088,000      
Purchases   4,407,000 1,187,000 21,166,000 17,959,000      
Stack's Bowers Galleries | September 19, 2017 Loan Agreement                
Related Party Transaction [Line Items]                
Short term loan receivable   1,100,000   1,100,000   6,400,000    
Maximum borrowing capacity available               $ 5,300,000
Stack's Bowers Galleries | March 1, 2018 Loan Agreement                
Related Party Transaction [Line Items]                
Short term loan receivable   7,800,000   7,800,000   7,500,000    
Equity method investee                
Related Party Transaction [Line Items]                
Receivables   2,011,000   2,011,000   4,978,000    
Payables   728,000   728,000   163,000    
Sales   128,297,000 142,889,000 229,320,000 275,487,000      
Purchases   6,311,000 2,214,000 21,150,000 5,688,000      
SilverTowne L.P.                
Related Party Transaction [Line Items]                
Receivables   298,000   298,000   241,000    
Payables   0   0   $ 0    
Sales   2,192,000 4,543,000 3,719,000 8,681,000      
Purchases   74,000 876,000 655,000 1,337,000      
Affiliated entities                
Related Party Transaction [Line Items]                
Interest income   1,756,000 1,898,000 3,681,000 3,920,000      
Affiliated entities | Interest income from secured loans receivables                
Related Party Transaction [Line Items]                
Interest income   243,000 275,000 541,000 489,000      
Affiliated entities | Interest income from finance products and repurchase arrangements                
Related Party Transaction [Line Items]                
Interest income   1,513,000 1,623,000 3,140,000 3,431,000      
Affiliated entities | Interest expense incurred related to long-term debt obligation                
Related Party Transaction [Line Items]                
Interest expense   0 147,000 0 342,000      
Goldline Lenders                
Related Party Transaction [Line Items]                
Debt Instrument, Fee Amount   $ 157,000   $ 157,000        
Contingent Consideration Liability                
Related Party Transaction [Line Items]                
Revaluation adjustment     $ 504,000   $ 504,000