Quarterly report pursuant to Section 13 or 15(d)

Secured Loans Receivable (Loans Receivable and Credit Quality Indicators) (Details)

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Secured Loans Receivable (Loans Receivable and Credit Quality Indicators) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans $ 152,343 $ 125,298
Secured loan, percentage 100.00% 100.00%
Secured loans (current) [1] $ 152,343 $ 125,298
Bullion and Numismatic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current) $ 152,343 $ 125,298
Secured loans (current), percentage 100.00% 100.00%
Bullion and Numismatic | Loan-to-value of 75% or more    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current) $ 87,565 $ 59,258
Secured loans (current), percentage 57.50% 47.30%
Bullion and Numismatic | Loan-to-value of less than 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current) $ 64,778 $ 66,040
Secured loans (current), percentage 42.50% 52.70%
Bullion    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans $ 123,626 $ 92,899
Secured loan, percentage 81.10% 74.10%
Numismatic and semi-numismatic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans $ 28,717 $ 32,399
Secured loan, percentage 18.90% 25.90%
[1] Includes amounts of the consolidated variable interest entity, which is presented separately in the table below.