Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets (Narrative) (Details)

v3.7.0.1
Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2012
Jul. 01, 2005
Finite-Lived Intangible Assets [Line Items]          
Amortization expense related to intangible assets   $ 422 $ 382    
SilverTowne Mint          
Finite-Lived Intangible Assets [Line Items]          
Intangibles acquired $ 2,500        
Goodwill acquired $ 4,300        
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      
Spectrum PMI          
Finite-Lived Intangible Assets [Line Items]          
Ownership percentage         80.00%
Spectrum PMI | Auctentia SL          
Finite-Lived Intangible Assets [Line Items]          
Noncontrolling interest percentage       20.00% 20.00%