Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Details)

v3.21.1
Related Party Transactions - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 19, 2019
USD ($)
Mar. 31, 2021
USD ($)
investment
Investee
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
investment
Investee
Mar. 31, 2020
USD ($)
Oct. 01, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 19, 2017
USD ($)
Related Party Transaction [Line Items]                
Number of investments | investment   3   3        
Carrying Value   $ 12,429,000   $ 12,429,000     $ 16,763,000  
Income (loss) from equity method investment   7,100,000 $ 300,000 13,897,000 $ 392,000      
Interest income   340,000 $ 186,000 904,000 $ 275,000      
Convertible Revolving Credit Facility                
Related Party Transaction [Line Items]                
Line of credit facility, maximum borrowing capacity $ 4,000,000              
Line of credit facility, interest rate 12.00%              
Line of credit facility, outstanding balance   2,500,000   2,500,000   $ 3,500,000 3,500,000  
March 1, 2018 Loan Agreement                
Related Party Transaction [Line Items]                
Maximum borrowing capacity available   $ 10,000,000   $ 10,000,000        
Participation interest, percentage of net profits realized on sale   10.00%   10.00%        
Equity method investee                
Related Party Transaction [Line Items]                
Number of investments | investment   3   3        
Equity method investee | Precious Metals Purchasing Partners, LLC                
Related Party Transaction [Line Items]                
Number of investees | Investee   2   2        
Stack's Bowers Galleries | September 19, 2017 Loan Agreement                
Related Party Transaction [Line Items]                
Maximum borrowing capacity available               $ 5,300,000
Short term loan receivable   $ 100,000   $ 100,000     700,000  
Stack's Bowers Galleries | March 1, 2018 Loan Agreement                
Related Party Transaction [Line Items]                
Short term loan receivable   $ 0   $ 0     $ 8,000,000