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, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Property, Plant and Equipment [Line Items]          
Restricted cash $ 400   $ 400   $ 400
Number of days notice to terminate contract     14 days    
Precious metals held under financing arrangements 226,905   $ 226,905   262,566
Revenue percentage from other sources (less than)     1.00%    
Advertising expense 648 $ 1,059 $ 1,238 $ 1,576  
Shipping, handling costs 1,092,595 1,671,822 $ 2,649,210 3,828,306  
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 1,371 1,099 $ 3,111 2,183  
Wholesale Trading          
Property, Plant and Equipment [Line Items]          
Precious metals held under financing arrangements 226,905   226,905   $ 262,566
Advertising expense $ 161 $ 183 $ 268 $ 284