Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Narrative) (Details)

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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jul. 01, 2019
Jun. 30, 2019
Property, Plant and Equipment [Line Items]            
Restricted cash $ 300   $ 300     $ 300
Number of days notice to terminate contract     14 days      
Precious metals held under financing arrangements 196,972   $ 196,972     208,792
Lease cost 400   800      
Operating lease cost $ 300   700      
Operating lease payments     $ 700      
Operating lease term (in years) 4 years 11 months 6 days   4 years 11 months 6 days      
Operating lease (percent) 4.90%   4.90%      
Revenue percentage from other sources (less than)     1.00%      
Advertising expense $ 346 $ 648 $ 809 $ 1,238    
Cost of sales 1,047,459 1,092,595 2,520,133 2,649,210    
Total present value of lease liabilities 5,723   5,723      
Operating lease right of use assets, net 4,787   $ 4,787     $ 0
Minimum            
Property, Plant and Equipment [Line Items]            
Estimated useful lives of related assets     3 years      
Estimated useful lives of intangibles     3 years      
Maximum            
Property, Plant and Equipment [Line Items]            
Estimated useful lives of related assets     25 years      
Estimated useful lives of intangibles     15 years      
Shipping and Handling            
Property, Plant and Equipment [Line Items]            
Cost of sales $ 1,500 $ 1,400 $ 2,800 $ 3,100    
Accounting Standards Update 2016-02            
Property, Plant and Equipment [Line Items]            
Total present value of lease liabilities         $ 6,300  
Operating lease right of use assets, net         $ 5,300