Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets (Narrative) (Details)

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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 28, 2017
Aug. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]            
Amortization expense related to intangible assets     $ 251 $ 108 $ 661 $ 315
SilverTowne Mint            
Finite-Lived Intangible Assets [Line Items]            
Intangibles acquired   $ 2,500        
Goodwill acquired   $ 4,300        
Goldline, LLC            
Finite-Lived Intangible Assets [Line Items]            
Intangibles acquired $ 5,000          
Goodwill acquired $ 1,500          
Minimum            
Finite-Lived Intangible Assets [Line Items]            
Estimated useful lives of intangibles         3 years  
Maximum            
Finite-Lived Intangible Assets [Line Items]            
Estimated useful lives of intangibles         15 years