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Debt (Line of Credit) (Details) - USD ($)
Jul. 31, 2017
Jun. 26, 2014
Dec. 31, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]        
Revolving line of credit     $ 9,800,000 $ 4,100,000
Pinnacle Bank | Line of Credit | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity $ 12,000,000      
Line of credit, maximum borrowing capacity upon satisfaction of certain conditions $ 20,000,000      
Line of credit facility, remaining borrowing capacity     $ 2,200,000  
Interest rate     3.3177%  
Line of credit, unused capacity, commitment fee percentage 0.25%      
Deferred finance costs     $ 100,000  
Pinnacle Bank | Line of Credit | Revolving Credit Facility | Minimum        
Line of Credit Facility [Line Items]        
Interest rate     1.75%  
Pinnacle Bank | Line of Credit | Revolving Credit Facility | Maximum        
Line of Credit Facility [Line Items]        
Interest rate     2.75%  
SunTrust Bank | Line of Credit | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity   $ 12,000,000    
Line of credit, maximum borrowing capacity upon satisfaction of certain conditions   $ 20,000,000    
Line of credit, unused capacity, commitment fee percentage   0.25%    
SunTrust Bank | Line of Credit | Revolving Credit Facility | Minimum        
Line of Credit Facility [Line Items]        
Interest rate   1.00%    
SunTrust Bank | Line of Credit | Revolving Credit Facility | Maximum        
Line of Credit Facility [Line Items]        
Interest rate   2.85%