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 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | GABON      
Number of Major Customers 1 1  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | GABON | Customer One [Member]      
Concentration Risk, Percentage 100.00% 100.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | EGYPT      
Number of Major Customers 1 1  
Concentration Risk, Percentage 100.00% 100.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CANADA      
Number of Major Customers 3 3  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CANADA | Customer One [Member]      
Concentration Risk, Percentage 45.00% 35.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CANADA | Customer Two [Member]      
Concentration Risk, Percentage 24.00% 30.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CANADA | Customer Three [Member]      
Concentration Risk, Percentage 20.00% 24.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Cote d'Ivoire 1 [Member]      
Number of Major Customers 1 1  
Concentration Risk, Percentage 100.00%    
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Cote d'Ivoire 1 [Member] | Customer One [Member]      
Concentration Risk, Percentage   100.00%  
Production Sharing Contract, September 17, 2018 Through September 16, 2028 [Member] | Foreign Tax Jurisdiction [Member] | Tax Administration of Gabon [Member]      
Accrued Income Taxes $ 9.7 $ 9.7 $ 18.9