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Note 4 - Revenue and Segment Information - Capital Expenditures (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Capital expenditures $ 29 $ 0 $ 168 $ 0
Refinery Operations [Member] | Operating Segments [Member]        
Capital expenditures [1] $ 29 $ 0 $ 168 $ 0
[1] The $0.1 million capital expenditure was vendor financed.