Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Revenue (Details Textual)

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Note 6 - Revenue (Details Textual)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | GABON    
Number of Major Customers 1  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | GABON | Customer One [Member]    
Concentration Risk, Percentage 100.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | EGYPT    
Number of Major Customers 1  
Concentration Risk, Percentage 100.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CANADA    
Number of Major Customers 3  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CANADA | Customer One [Member]    
Concentration Risk, Percentage 40.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CANADA | Customer Two [Member]    
Concentration Risk, Percentage 30.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CANADA | Customer Three [Member]    
Concentration Risk, Percentage 19.00%  
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Foreign Tax Jurisdiction [Member] | Tax Administration of Gabon [Member]    
Accrued Income Taxes $ 37.5 $ 18.9