Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Details)

v3.25.0.1
Related Party Transactions - Additional Information (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 51 Months Ended 81 Months Ended
Mar. 04, 2022
USD ($)
Mar. 01, 2018
USD ($)
Nov. 30, 2024
USD ($)
shares
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
Dec. 31, 2024
USD ($)
Investment
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
Investment
shares
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
shares
Jun. 30, 2022
shares
Dec. 31, 2024
USD ($)
Investment
shares
Jul. 01, 2024
Apr. 01, 2021
USD ($)
Related Party Transaction [Line Items]                              
Carrying Value         $ 50,200,000   $ 48,200,000   $ 48,200,000       $ 48,200,000    
Operating lease right of use assets         9,543,000   8,431,000   8,431,000       $ 8,431,000    
Earnings (losses) from equity method investments             (2,410,000) $ 777,000 (1,832,000) $ 3,486,000          
Dividends and distributions received from equity method investees             0 0 $ 169,000 269,000          
Shares repurchased during period | shares                 169,512   335,735 0 1,321,003    
Value of shares repurchased during period                 $ 5,100,000   $ 9,800,000   $ 37,300,000    
Selling, general, and administrative expenses             25,754,000 22,396,000 52,371,000 44,241,000          
Collectible Card Partners, LLC | Notes Payable                              
Related Party Transaction [Line Items]                              
Maximum borrowing                             $ 4,000,000
Line of credit, termination date           Apr. 01, 2026                  
Borrowings due on demand         4,000,000   4,000,000   4,000,000       4,000,000    
Interest expense             46,000 10,000 93,000 12,000          
Silver Gold Bull, Inc.                              
Related Party Transaction [Line Items]                              
Dividends declared         $ 15,900,000                    
Dividends received                 11,900,000            
Silver Gold Bull, Inc. | O2024 A Dividends                              
Related Party Transaction [Line Items]                              
Dividend payment month         2024-09                    
Stack's Bowers Galleries | Secured Line of Credit on Wholesale Value                              
Related Party Transaction [Line Items]                              
Maximum borrowing   $ 10,000,000                          
Percentage of royalty income   10.00%                          
Initial term of loan   180 days                          
Extended additional consecutive loan period   30 days                          
Borrowings due on demand         $ 0   0   0       0    
Stack's Bowers Galleries | Secured Line of Credit Based on Collateral Value                              
Related Party Transaction [Line Items]                              
Maximum borrowing $ 3,000,000                            
Initial term of loan 180 days                            
Extended additional consecutive loan period 180 days                            
Borrowings due on demand         0   $ 0   $ 0       $ 0    
Equity method investee                              
Related Party Transaction [Line Items]                              
Number of investments | Investment             6   6       6    
Related Party                              
Related Party Transaction [Line Items]                              
Operating lease right of use assets         2,000,000   $ 1,800,000   $ 1,800,000       $ 1,800,000    
Other income             600,000 400,000 $ 800,000 700,000          
Shares repurchased during period | shares     139,455           139,455            
Value of shares repurchased during period     $ 4,200,000                        
Related Party | Directors and Officers                              
Related Party Transaction [Line Items]                              
Transactions through A-Mark and/or subsidiaries for an aggregate dollar value             1,000,000 1,900,000   1,900,000          
Solid Crossing and Stack's Bowers Galleries | Consulting Agreement with Cerberus Limited | Leasing Agreements                              
Related Party Transaction [Line Items]                              
Selling, general, and administrative expenses             409,000 $ 12,000 $ 770,000 $ 24,000          
SGB Shareholders | Silver Gold Bull, Inc.                              
Related Party Transaction [Line Items]                              
Dividends received       $ 7,500,000                      
Other Shareholders | Silver Gold Bull, Inc.                              
Related Party Transaction [Line Items]                              
Dividend payable         $ 8,400,000   4,000,000   $ 4,000,000       $ 4,000,000    
AMGL Agreement with WAR Construction                              
Related Party Transaction [Line Items]                              
Incurred costs             $ 1,500,000                
W.A. Richardson Builders, LLC                              
Related Party Transaction [Line Items]                              
Miniortiy ownership percentage                           10.00%