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Shareholders' Equity and Debt (Debt) (Details) - USD ($)
Jun. 26, 2014
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Line of Credit Facility [Line Items]        
Revolving line of credit   $ 3,500,000 $ 1,700,000 $ 1,700,000
SunTrust Bank | Line of Credit | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Expiration period 3 years      
Line of credit, maximum borrowing capacity upon satisfaction of certain conditions $ 20,000,000      
Line of credit, maximum borrowing capacity $ 12,000,000      
Interest rate spread, minimum 1.00%      
Interest rate spread, maximum 2.85%      
Effective interest rate   1.50%    
Line of credit, unused capacity, commitment fee percentage 0.25%