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Debt (Line of Credit) (Details) - USD ($)
Jun. 26, 2014
Dec. 31, 2016
Dec. 31, 2015
Aug. 31, 2011
Line of Credit Facility [Line Items]        
Revolving line of credit   $ 4,100,000 $ 1,700,000  
Line of Credit | Credit Facility, Fifth Amended and Restated Loan Agreement, the Agreement, August 2011 | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit, maximum borrowing capacity       $ 10,000,000
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      
Interest rate, minimum 1.00%      
Interest rate, maximum 2.85%      
Debt instrument, interest rate at end of period   1.60%    
Line of credit, unused capacity, commitment fee percentage 0.25%      
Deferred finance costs   $ 100,000