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
12 Months Ended
Jun. 30, 2016
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 70,504 $ 91,238
Secured loan, percentage 100.00% 100.00%
Secured loans (current) $ 70,004 $ 91,238
Bullion and Numismatic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 69,804 $ 91,238
Secured loan, percentage 99.00% 100.00%
Secured loans (current) $ 69,804 $ 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) $ 10,231 $ 60,432
Secured loans (current), percentage 14.70% 66.20%
Bullion and Numismatic | Loan-to-value of less than 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current) $ 59,573 $ 30,806
Secured loans (current), percentage 85.30% 33.80%
Bullion    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 35,168 $ 61,767
Secured loan, percentage 49.90% 67.70%
Numismatic and semi-numismatic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 34,636 $ 29,471
Secured loan, percentage 49.10% 32.30%
Other pledged assets    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 700 $ 0
Secured loan, percentage 1.00% 0.00%
Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Credit quality indicator Loan-to-value threshold percentage 75.00%