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 12 Months Ended
Aug. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]          
Goodwill   $ 8,881   $ 8,881  
Amortization expense related to intangible assets   (252) $ (157)    
Goodwill and indefinite-lived intangible asset impairment       $ 2,700  
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 assets   5,000      
Goodwill   $ 1,364     $ 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