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Note 11 - Major Customers (Details Textual) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
DK Trading and Supply, LLC [Member]    
Concentration Risk, Percentage 87.00% 75.00%
Energy Transfer Crude Marketing, LLC [Member]    
Concentration Risk, Percentage 10.00% 19.00%