Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Secured Loans Receivable (Loans Receivable and Credit Quality Indicators) (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2017
Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 92,676 $ 70,504
Secured loan, percentage 100.00% 100.00%
Secured loans (current) $ 92,676 $ 70,004
Credit quality indicator Loan-to-value threshold percentage 75.00%  
Bullion and Numismatic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 92,676 $ 69,804
Secured loan, percentage 100.00% 99.00%
Secured loans (current) $ 92,676 $ 69,804
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) $ 23,571 $ 10,231
Secured loans (current), percentage 25.40% 14.70%
Bullion and Numismatic | Loan-to-value of less than 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loans (current) $ 69,105 $ 59,573
Secured loans (current), percentage 74.60% 85.30%
Bullion    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 59,802 $ 35,168
Secured loan, percentage 64.50% 49.90%
Numismatic and semi numismatic    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 32,874 $ 34,636
Secured loan, percentage 35.50% 49.10%
Other pledged assets    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Secured loan $ 0 $ 700
Secured loan, percentage 0.00% 1.00%