Quarterly report pursuant to Section 13 or 15(d)

Description of Business - Additional Information (Details)

v3.20.1
Description of Business - Additional Information (Details)
9 Months Ended
Mar. 31, 2020
USD ($)
reportable_segments
Sep. 30, 2018
USD ($)
Description Of Business [Line Items]    
Number of reportable segments | reportable_segments 3  
AM Capital Funding, LLC. | Secured Senior Term Notes, Series 2018-1, Class B | Senior Subordinated Notes    
Description Of Business [Line Items]    
Debt instrument, face amount $ 28,000,000 $ 28,000,000
Stated interest rate (in percentage) 5.98% 5.98%
AM Capital Funding, LLC. | Secured Senior Term Notes, Series 2018-1, Class A | Senior Subordinated Notes    
Description Of Business [Line Items]    
Debt instrument, face amount $ 72,000,000 $ 72,000,000
Stated interest rate (in percentage) 4.98% 4.98%
AM&ST Associates, LLC    
Description Of Business [Line Items]    
Percentage of ownership owned by parent 69.00%  
AM&ST Associates, LLC | SilverTowne L.P.    
Description Of Business [Line Items]    
Percentage of ownership owned by noncontrolling Owners 31.00%  
Precious Metals Purchasing Partners, LLC    
Description Of Business [Line Items]    
Percentage of ownership percentage 50.00%