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Derivative (Narratives) (Details) - USD ($)
3 Months Ended 9 Months Ended
Jan. 31, 2018
Sep. 30, 2019
Sep. 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 $ 300,000  
Derivative Interest Rate Swap Effective Percentage   100.00%    
Secured Debt   $ 54,319,000 $ 54,319,000 $ 60,795,000
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000,000      
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