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Note 2 - Revenue Recognition (Details Textual) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2024
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Year Marine Bunkering Contract [Member] |  |
Concentration Risk, Percentage | 31.00% | 34.00%

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