Quarterly report pursuant to Section 13 or 15(d)

Description of Business - Narrative (Details)

v3.19.3
Description of Business - Narrative (Details)
3 Months Ended
Sep. 30, 2019
reportable_segments
Sep. 30, 2018
USD ($)
Business Acquisition [Line Items]    
Number of reportable segments | reportable_segments 3  
AM&ST Associates, LLC | AMST    
Business Acquisition [Line Items]    
Percentage of voting interests acquired (in percentage) 69.00%  
AM&ST Associates, LLC | SilverTowne    
Business Acquisition [Line Items]    
Percentage of voting interests acquired (in percentage) 31.00%  
Precious Metals Purchasing Partners, LLC | AMST    
Business Acquisition [Line Items]    
Percentage of voting interests acquired (in percentage) 50.00%  
AM Capital Funding, LLC. | Secured Senior Term Notes, Series 2018-1, Class A | Senior Subordinated Notes    
Business Acquisition [Line Items]    
Debt instrument, face amount   $ 72,000,000
Stated interest rate (in percentage)   4.98%
AM Capital Funding, LLC. | Secured Senior Term Notes, Series 2018-1, Class B | Senior Subordinated Notes    
Business Acquisition [Line Items]    
Debt instrument, face amount   $ 28,000,000
Stated interest rate (in percentage)   5.98%