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Note 14 - Segment Information, Geographical Data and Major Customers - Entity Wide Major Customer (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Eni S.p.A. [Member]      
Concentration Risk, Percentage 10.30%    
Chevron Corporation [Member]      
Concentration Risk, Percentage   12.30% 15.70%
Saudi Aramco [Member]      
Concentration Risk, Percentage     11.80%