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 6 Months Ended
Aug. 28, 2017
Aug. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]              
Amortization expense related to intangible assets     $ 253 $ 111 $ 410 $ 207  
Goodwill     $ 10,331   $ 10,331   $ 8,881
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            
Goodwill $ 1,450            
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