Annual report pursuant to Section 13 and 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
Jun. 30, 2018
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 110,424 $ 91,238
Secured loan, percentage 100.00% 100.00%
Secured loans (current) $ 110,424 $ 91,238
Bullion and Numismatic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current) $ 110,424 $ 91,238
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) $ 69,629 $ 60,432
Secured loans (current), percentage 63.10% 66.20%
Bullion and Numismatic | Loan-to-value of less than 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current) $ 40,795 $ 30,806
Secured loans (current), percentage 36.90% 33.80%
Bullion    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 72,128 $ 61,767
Secured loan, percentage 65.30% 67.70%
Numismatic and semi-numismatic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 38,296 $ 29,471
Secured loan, percentage 34.70% 32.30%