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Commitments and Contingencies Textuals (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Liabilty Recorded For Stanby Letter of Credit [Abstract]    
Liability Recorded For Standy Letters Of Credit $ 79 $ 84
Operating Leases, Future Minimum Payments Due [Abstract]    
Operating Leases, Future Minimum Payments Due, Current 65  
Operating Leases, Future Minimum Payments, Due in Two Years 35  
Operating Leases, Future Minimum Payments, Due in Three Years 3  
Operating Leases, Future Minimum Payments, Due in Four Years 0  
Operating Leases, Future Minimum Payments, Due in Five Years $ 0