Note 5 - Concentration of Risk - Product Sales (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Revenue	$ 396,048	$ 487,504
Refinery Operations [Member]
Revenue	$ 390,016	$ 483,061
% of revenue	100.00%	100.00%
LPG Mix [Member] \| Refinery Operations [Member]
Revenue	$ 302	$ 122
% of revenue	0.10%	0.00%
Naphtha [Member] \| Refinery Operations [Member]
Revenue	$ 76,050	$ 99,946
% of revenue	19.50%	20.70%
Jet Fuel [Member] \| Refinery Operations [Member]
Revenue	$ 123,395	$ 173,646
% of revenue	31.60%	35.90%
HOBM [Member] \| Refinery Operations [Member]
Revenue	$ 92,947	$ 88,472
% of revenue	23.80%	18.30%
AGO [Member] \| Refinery Operations [Member]
Revenue	$ 97,322	$ 120,875
% of revenue	25.10%	25.10%

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 606
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+ Details