Note 4 - Revenue and Segment Information - Segment Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Revenues from operations		$ 396,048	$ 487,504
Operation costs and expenses	[1]	(351,578)	(441,654)
Gross profit		44,678	46,071
General and administrative expenses		(3,134)	(2,915)
General and administrative expenses		3,134	2,915
Depreciation and amortization		(2,798)	(2,798)
Interest and other non-operating expenses, net	[2]	(5,862)	(5,884)
Income (loss) before income taxes		30,526	33,199
Income (loss) before income taxes		(30,526)	(33,199)
Income tax expense		485	(307)
Net income		31,011	32,892
Operating Segments [Member]
Gross profit		44,678	46,071
Consolidation, Eliminations [Member]
Revenues from operations	[3]	0	0
Corporate, Non-Segment [Member]
Operation costs and expenses	[1]	(208)	(221)
General and administrative expenses		5,492	4,190
General and administrative expenses		(5,492)	(4,190)
Depreciation and amortization	[4]	(219)	(206)
Interest and other non-operating expenses, net		(768)	(1,698)
Income (loss) before income taxes	[2]	4,754	3,985
Income (loss) before income taxes	[2]	(4,754)	(3,985)
Refinery Operations [Member]
Revenues from operations		390,016	483,061
Refinery Operations [Member] | Operating Segments [Member]
Revenues from operations		390,016	483,061
Operation costs and expenses	[1]	(349,737)	(439,291)
Gross profit		37,689	41,187
General and administrative expenses	[4]	(1,638)	(1,682)
General and administrative expenses	[4]	1,638	1,682
Depreciation and amortization		(1,211)	(1,224)
Interest and other non-operating expenses, net	[2]	(3,130)	(2,753)
Income (loss) before income taxes		31,710	35,528
Income (loss) before income taxes		(31,710)	(35,528)
Refinery Operations [Member] | Consolidation, Eliminations [Member]
Revenues from operations	[3]	(2,590)	(2,583)
Tolling and Terminaling [Member]
Revenues from operations		6,032	4,443
Tolling and Terminaling [Member] | Operating Segments [Member]
Revenues from operations		6,032	4,443
Operation costs and expenses	[1]	(1,633)	(2,142)
Gross profit	[5]	6,989	4,884
General and administrative expenses	[4]	(87)	(427)
General and administrative expenses	[4]	87	427
Depreciation and amortization		(1,368)	(1,368)
Interest and other non-operating expenses, net	[2]	(1,964)	(1,433)
Income (loss) before income taxes		3,570	1,656
Income (loss) before income taxes		(3,570)	(1,656)
Tolling and Terminaling [Member] | Consolidation, Eliminations [Member]
Revenues from operations	[3]	2,590	2,583
Corporate Segment [Member] | Operating Segments [Member]
General and administrative expenses		3,767	2,081
General and administrative expenses		$ (3,767)	$ (2,081)

[1] Operation costs include cost of goods sold. Also, operation costs within: (a) tolling and terminaling includes terminal operating expenses and an allocation of other costs (e.g., insurance and maintenance) and (b) corporate and other includes expenses related to BDSC, BDPC and BDPL.

[2] Corporate and other within interest and other non-operating expenses, net primarily reflects interest expense for the LE Amended and Restated Guaranty Fee Agreement, LRM Amended and Restated Guaranty Fee Agreement, June LEH Note, March Carroll Note, and March Ingleside Note. See “Note (3)” and “Note (15)” to our consolidated financial statements for additional information regarding guaranty fee agreements.

[3] Fees associated with an intercompany tolling agreement related to naphtha volumes.

[4] General and administrative expenses within refinery operations include the LEH operating fee, impairment expense, and bad debt expense.

[5] Tolling and terminaling segment contribution margin is based on fees associated with an intercompany tolling agreement related to naphtha volumes.