Quarterly report pursuant to Section 13 or 15(d)

Description of Business - Acquisitions (Details)

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Description of Business - Acquisitions (Details)
3 Months Ended
Aug. 28, 2017
USD ($)
Sep. 30, 2018
USD ($)
Segment
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Aug. 31, 2016
Business Acquisition [Line Items]        
Number of reportable segments | Segment   3    
Tax rate   25.80% 38.20%  
Goldline, LLC        
Business Acquisition [Line Items]        
Purchase price $ 10,000,000      
Fair value of intangible assets acquired 6,400,000      
Fair value of tangible asset acquired 3,600,000      
Holdback amount 1,500,000      
Holdback amount released   $ 750,000.00    
Net asset purchase price 10,000,000 9,500,000    
Pro-forma revenue   1,565,090,000 $ 2,166,054,000  
Pro-forma net income   $ 1,481,000 $ 216,000  
Pro from basic earnings per share (usd per share) | $ / shares   $ 0.21 $ 0.03  
Pro from dilutive earnings per share (usd per share) | $ / shares   $ 0.21 $ 0.03  
Liabilities incurred for the acquisition $ 7,500,000      
Business Combination, Transition Service Agreement, Term 2 years      
Pro Forma        
Business Acquisition [Line Items]        
Tax rate   (25.80%) 37.50%  
AM&ST Associates, LLC | AMST        
Business Acquisition [Line Items]        
Percentage of voting interests acquired (in percentage)   69.00%   55.00%
AM&ST Associates, LLC | SilverTowne        
Business Acquisition [Line Items]        
Percentage of voting interests acquired (in percentage)   31.00%   45.00%