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Derivative (Narratives) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 31, 2018
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosure [Line Items]        
Deferred losses on derivative instruments accumulated in AOCI expected to be reclassified to earnings   $ 93,000 $ 200,000  
Derivative Interest Rate Swap Effective Percentage   100.00%    
Secured Debt   $ 54,821,000 54,821,000 $ 60,795,000
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000,000      
Other liabilities-non current [Member] | Derivatives qualifying as hedges [Member]        
Derivative Instruments And Hedging Activities Disclosure [Line Items]        
Notional Amount of Interest Rate Derivatives   $ 31,591,000 $ 31,591,000 $ 34,090,000
Term Loan [Member]        
Derivative Instruments And Hedging Activities Disclosure [Line Items]        
Notional Amount of Interest Rate Swaps $ 36,000,000      
LIBOR Fixed Rate 2.72%      
Secured Debt $ 64,000,000