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Commitments and Contingencies (Details Textual)
 12 Months Ended
Dec. 31, 2017
USD ($)
Officers
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Commitments and Contingencies (Textual)      
Description of employment agreement These agreements also include a) an incentive program, b) a stock option plan, c) a one-year non-compete agreement upon termination and a severance payment equal to one year of compensation.    
Estimated aggregate salary commitment $ 2,800,000    
Agreement with data processor expire date 2023    
Base monthly charges under agreement with data processor $ 102,000    
Operating lease expired date 2028    
Lease expense $ 1,300,000 $ 1,200,000 $ 954,000
Chief Executive Officer [Member]      
Commitments and Contingencies (Textual)      
Period of employment agreement 3 years    
President [Member]      
Commitments and Contingencies (Textual)      
Period of employment agreement 2 years    
Executive Vice President [Member]      
Commitments and Contingencies (Textual)      
Period of employment agreement 2 years    
Number of executive officers | Officers 12