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Goodwill (Narrative) (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2014
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Goodwill $ 2,791,000 $ 2,791,000 $ 2,800,000
Goodwill impairment $ 0 $ 0  
TPI, BEM And NB [Member]      
Business Acquisition, Equity Interests Issued or Issuable [Line Items]      
Aggregate consideration     $ 5,500,000