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Acquisitions (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Jan. 17, 2017
Nov. 03, 2015
Oct. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]                
Purchase price     $ 693          
Unaudited proforma revenues           $ 73,828 $ 80,698 $ 79,951
Hearing Help Express (HHE) [Member]                
Business Acquisition [Line Items]                
Acquisition date           Oct. 18, 2016    
Ownership percentage       20.00%   20.00%    
Recognized additional revenue       $ 1,025        
Recognized losses       (3)        
Acquisition costs       $ 216   $ 216    
PC Werth Ltd [Member]                
Business Acquisition [Line Items]                
Acquisition date           Nov. 03, 2015    
Purchase price   $ 197            
Assumed payables   $ 393            
Recognized additional revenue         $ 414      
Recognized losses         265      
Acquisition costs         $ 143   $ 143  
Subsequent Event [Member] | Hearing Help Express (HHE) [Member]                
Business Acquisition [Line Items]                
Ownership percentage 80.00%              
Purchase price $ 650              
Earn out $ 185