Note 3 - Related-party Transactions - Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue from operations	$ 70,355	$ 82,109	$ 210,630	$ 242,790
Percentage of revenues from operations	100.00%	100.00%	100.00%	100.00%
Lazarus Energy Holdings (LEH) [Member] | Refinery Operations [Member]
Revenue from operations	$ 28,123	$ 21,185	$ 77,192	$ 84,591
Percentage of revenues from operations	40.00%	25.80%	36.60%	34.80%
Lazarus Energy Holdings (LEH) [Member] | Tolling and Terminaling [Member]
Revenue from operations	$ 585	$ 540	$ 1,665	$ 1,620
Percentage of revenues from operations	0.80%	0.70%	0.80%	0.70%
Related Party [Member]
Interest expense, related party	$ 318	$ 318	$ 952	$ 926
Related Party [Member] | Jonathan Carroll [Member] | LE Term Loan Due 2034 [Member]
Interest expense, related party	90	96	275	291
Related Party [Member] | Jonathan Carroll [Member] | NPS Term Loan Due 2031 [Member]
Interest expense, related party	45	66	138	166
Related Party [Member] | Jonathan Carroll [Member] | LRM Term Loan Due 2034 [Member]
Interest expense, related party	38	40	115	121
Related Party [Member] | Jonathan Carroll [Member] | BDEC Term Loan Due 2051 [Member]
Interest expense, related party	10	10	30	30
Related Party [Member] | Lazarus Energy Holdings (LEH) [Member] | BDPL-LEH Loan Agreement [Member]
Interest expense, related party	135	106	394	318
Nonrelated Party [Member] | Refinery Operations [Member]
Revenue from operations	$ 41,467	$ 60,095	$ 131,061	$ 155,152
Percentage of revenues from operations	58.90%	73.20%	62.20%	63.90%
Nonrelated Party [Member] | Tolling and Terminaling [Member]
Revenue from operations	$ 180	$ 289	$ 712	$ 1,427
Percentage of revenues from operations	0.30%	0.40%	0.30%	0.60%