Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Schedule of Related Party Receivable and Payables Balances (Details)

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Related Party Transactions - Schedule of Related Party Receivable and Payables Balances (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Jun. 30, 2020
Related Party Transaction [Line Items]    
Receivables $ 7,092 $ 13,359
Payables 1 3,421
Stack's Bowers Galleries    
Related Party Transaction [Line Items]    
Receivables 246 7,981
Equity method investee    
Related Party Transaction [Line Items]    
Receivables 6,702 5,301
Payables 1 3,421
SilverTowne L.P.    
Related Party Transaction [Line Items]    
Receivables $ 144 $ 77