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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

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