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 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jul. 01, 2019
Jun. 30, 2018
Property, Plant and Equipment [Line Items]            
Restricted cash $ 300   $ 300     $ 400
Number of days notice to terminate contract     14 days      
Precious metals held under financing arrangements 212,622   $ 212,622     262,566
Revenue percentage from other sources (less than)     1.00%      
Advertising expense 619 $ 961 $ 1,857 $ 2,537    
Shipping, handling costs 1,258,270 1,987,536 $ 3,907,480 5,815,842    
Forecast | Accounting Standards Update 2016-02            
Property, Plant and Equipment [Line Items]            
Right-of-use asset         $ 6,500  
Lease liability         $ 6,500  
Right-of-use asset, percentage of total assets         1.00%  
Lease liability, percentage of total assets         0.00%  
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]            
Shipping, handling costs 1,671 1,315 $ 4,782 3,498    
Wholesale Trading            
Property, Plant and Equipment [Line Items]            
Precious metals held under financing arrangements 212,622   212,622     $ 262,566
Advertising expense $ 115 $ 157 $ 383 $ 441