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Significant Accounting Policies And Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Disclosure of offsetting of financial assets [Line Items]        
Right of use asset $ 618     $ 0
Revenue From Rendering Of services 6,942 $ 8,132    
Cyberonica        
Disclosure of offsetting of financial assets [Line Items]        
Right of use asset     $ 674  
Lease liability     $ 674  
Depreciation charge for right-of-use assets 56      
Interest expense on lease liabilities 26      
Time charters leases        
Disclosure of offsetting of financial assets [Line Items]        
Revenue From Rendering Of services 3,861      
Operating lease income $ 3,081