Note 3 - Related-party Transactions - Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue from operations	$ 91,022	$ 116,661
Interest expense, related party	1,514	1,332
Tolling and Terminaling [Member]
Revenue from operations	$ 91,022	$ 116,661
Percentage of revenues from operations	100.00%	100.00%
Lazarus Energy Holdings (LEH) [Member] | Refinery Operations [Member]
Revenue from operations	$ 27,394	$ 35,345
Percentage of revenues from operations	30.10%	30.30%
Lazarus Energy Holdings (LEH) [Member] | Tolling and Terminaling [Member]
Revenue from operations	$ 540	$ 540
Percentage of revenues from operations	0.60%	0.50%
Related Party [Member]
Interest expense, related party	$ 305	$ 365
Related Party [Member] | Jonathan Carroll [Member] | LE Term Loan Due 2034 [Member]
Interest expense, related party	98	102
Related Party [Member] | Jonathan Carroll [Member] | NPS Term Loan Due 2031 [Member]
Interest expense, related party	50	50
Related Party [Member] | Jonathan Carroll [Member] | LRM Term Loan Due 2034 [Member]
Interest expense, related party	41	43
Related Party [Member] | Jonathan Carroll [Member] | BDEC Term Loan Due 2051 [Member]
Interest expense, related party	10	10
Related Party [Member] | Lazarus Energy Holdings (LEH) [Member] | BDPL-LEH Loan Agreement [Member]
Interest expense, related party	106	160
Nonrelated Party [Member] | Refinery Operations [Member]
Revenue from operations	$ 62,521	$ 79,295
Percentage of revenues from operations	68.70%	68.00%
Nonrelated Party [Member] | Tolling and Terminaling [Member]
Revenue from operations	$ 567	$ 1,481
Percentage of revenues from operations	0.60%	1.30%