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Nature of Operations, Basis of Presentation and Going Concern (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 03, 2013
Dec. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
a
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
a
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Nature of Operations, Basis of Presentation and Going Concern (Textual)              
Net loss     $ (1,313) $ (1,241) $ (3,483) $ (7,492)  
Accumulated deficit   $ (199,115) $ (202,598)   $ (202,598)   $ (199,115)
Impairment of oil and gas properties           $ 30,906
Megiddo Jezreel License [Member]              
Nature of Operations, Basis of Presentation and Going Concern (Textual)              
Area of land depth, description Zion received a multi-year license extension through December 2, 2020.            
Area of land, approximate | a     99,000   99,000    
Initial length of lease 3 years            
Accumulated deficit     $ 3,500   $ 3,500    
Impairment of oil and gas properties   $ 30,906          
Minimum [Member] | Megiddo Jezreel License [Member]              
Nature of Operations, Basis of Presentation and Going Concern (Textual)              
Area of land depth, description         The Megiddo Jezreel #1 (“MJ #1”) exploratory well was spud on June 5, 2017 and drilled to a total depth (“TD”) of 5,060 meters (approximately 16,600 feet). Thereafter, the Company successfully cased and cemented the well while awaiting the approval of the testing protocol. The Ministry of Energy approved the well testing protocol on April 29, 2018.    
Initial length of lease 1 year            
Post-impairment charge     $ 65   $ 228    
Maximum [Member] | Megiddo Jezreel License [Member]              
Nature of Operations, Basis of Presentation and Going Concern (Textual)              
Initial length of lease 7 years