Annual report pursuant to Section 13 and 15(d)

Related Party Transactions - Additional Information (Details)

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Related Party Transactions - Additional Information (Details)
1 Months Ended 12 Months Ended
Mar. 04, 2022
USD ($)
Mar. 01, 2018
USD ($)
Jun. 30, 2024
USD ($)
Investment
Mar. 31, 2024
Jun. 30, 2024
USD ($)
Investment
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 27, 2022
Apr. 01, 2021
USD ($)
Related Party Transaction [Line Items]                  
Carrying Value     $ 50,200,000   $ 50,200,000 $ 88,300,000      
Operating lease right of use assets     9,543,000   9,543,000 5,119,000      
Earnings from equity method investments         4,044,000 12,576,000 $ 6,907,000    
Dividends and distributions received from equity method investees         642,000 978,000 1,678,000    
Selling, general, and administrative expenses         $ 89,800,000 85,282,000 76,618,000    
O2024 A Dividends                  
Related Party Transaction [Line Items]                  
Dividend, payment date         Apr. 29, 2024        
Secured Line of Credit on Wholesale Value                  
Related Party Transaction [Line Items]                  
Borrowings due on demand     0   $ 0 0      
Secured Line of Credit Based on Collateral Value                  
Related Party Transaction [Line Items]                  
Borrowings due on demand     0   0 0      
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   4,000,000 500,000      
Interest expense         $ 78,000 38,000 0    
Silver Gold Bull, Inc.                  
Related Party Transaction [Line Items]                  
Dividends declared     $ 15,900,000            
Business acquisition, percentage of interests acquired     8.00%   8.00%     40.00%  
Silver Gold Bull, Inc. | O2024 A Dividends                  
Related Party Transaction [Line Items]                  
Dividend, payment date     Sep. 09, 2024            
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              
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                
Equity method investee                  
Related Party Transaction [Line Items]                  
Number of investments | Investment     6   6        
Related Party                  
Related Party Transaction [Line Items]                  
Operating lease right of use assets     $ 2,000,000   $ 2,000,000 0      
Other income         1,200,000 2,600,000 2,200,000    
Foreign currency transactions through A-Mark for an aggregate dollar value         3,100,000 2,100,000 1,300,000    
Solid Crossing and Stack's Bowers Galleries | Consulting Agreement with Cerberus Limited | Leasing Agreements                  
Related Party Transaction [Line Items]                  
Selling, general, and administrative expenses         285,000 $ 34,000 $ 0    
SGB Shareholders | Silver Gold Bull, Inc.                  
Related Party Transaction [Line Items]                  
Dividends receivable     7,500,000   7,500,000        
Other Shareholders | Silver Gold Bull, Inc.                  
Related Party Transaction [Line Items]                  
Dividend payable     $ 8,400,000   $ 8,400,000