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Derivative Financial Instruments (Details) - USD ($)
3 Months Ended 9 Months Ended
Jan. 18, 2018
Jan. 04, 2016
Jan. 23, 2014
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Derivatives, Fair Value [Line Items]                
Hedge ineffectiveness gain (loss)           $ 0 $ 0  
Derivative Asset       $ 4,000   4,000    
Derivative Liability               $ (221,000)
Interest Rate Swap Contracts                
Derivatives, Fair Value [Line Items]                
Percentage of Term Loan balance covered under interest rate swap contract     75.00%          
Termination of contract date   Jan. 01, 2019 Sep. 30, 2023          
Notional amount   $ 9,100,000   $ 6,700,000   $ 6,700,000    
Fixed interest rate (in hundredths)     2.86375%          
Interest earned upon termination of swap agreement $ 27,000              
Interest Rate Swap Contracts | One Month LIBOR                
Derivatives, Fair Value [Line Items]                
One month variable interest rate (in hundredths)       2.18%   2.18%    
Interest Rate Swap Contracts | Derivatives in Cash Flow Hedging Relationships | Interest Expense                
Effect of interest rate swap contract accounted for derivative instrument on Consolidated Statements of Income [Abstract]                
Amount of Gain Recognized in Accumulated OCI (Effective Portion)       $ 52,000 $ 24,000 $ 225,000 101,000  
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)       $ 13,000 $ 30,000 $ 52,000 $ 123,000