Note 4 - Revenue and Segment Information - Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2025		Jun. 30, 2024	Jun. 30, 2025		Jun. 30, 2024
Revenues from operations		$ 56,583		$ 69,659	$ 140,275		$ 160,681
Crude oil, fuel use, and chemicals		50,669		64,820	125,245		141,489
Other conversion costs		4,581		8,485	6,862		10,598
Tolling and terminaling costs		140		410	262		820
Depreciation and amortization		643		643	1,283		1,286
Total costs of goods sold		56,033		74,358	133,652		154,193
LEH operating fee, related party		276		254	458		426
General and administrative expenses		704		1,471	2,059		2,454
Other operating expenses	[1]	125		140	244		280
Depreciation and amortization		74		62	148		123
Interest, net		1,552		1,440	3,016		2,806
Total costs and expenses		58,764		77,725	139,577		160,282
Income (loss) before income taxes		(2,181)		(8,066)	698		399
Income tax benefit (expense)		459		1,716	(176)		(125)
Net income		(1,722)		(6,350)	522		274
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenues from operations		0		0	0		0
Crude oil, fuel use, and chemicals		0		0	0		0
Other conversion costs		0		0	0		0
Tolling and terminaling costs		0		0	0		0
Depreciation and amortization		0		0	0		0
Total costs of goods sold		0		0	0		0
LEH operating fee, related party		0		0	0		0
General and administrative expenses		52		1,011	980		1,734
Other operating expenses	[1]	125		140	244		280
Depreciation and amortization		74		62	148		123
Interest, net		180		137	331		273
Total costs and expenses		431		1,350	1,703		2,410
Income (loss) before income taxes		(431)		(1,350)	(1,703)		(2,410)
Income tax benefit (expense)		459		1,716	(176)		(125)
Net income		28		366	(1,879)		(2,535)
Consolidation, Eliminations [Member]
Revenues from operations		(573)	[2]	(573)	(1,140)	[2]	(1,076)
Crude oil, fuel use, and chemicals		0	[2]	0	0	[2]	0
Other conversion costs		(573)	[2]	(573)	(1,140)	[2]	(1,076)
Tolling and terminaling costs		0	[2]	0	0	[2]	0
Depreciation and amortization		0	[2]	0	0	[2]	0
Total costs of goods sold		(573)	[2]	(573)	(1,140)	[2]	(1,076)
LEH operating fee, related party		0	[2]	0	0	[2]	0
General and administrative expenses		0	[2]	0	0	[2]	0
Other operating expenses	[1]	0	[2]	0	0	[2]	0
Depreciation and amortization		0	[2]	0	0	[2]	0
Interest, net		0	[2]	0	0	[2]	0
Total costs and expenses		(573)	[2]	(573)	(1,140)	[2]	(1,076)
Income (loss) before income taxes		0	[2]	0	0	[2]	0
Income tax benefit (expense)		0	[2]	0	0		0
Net income		0	[2]	0	0	[2]	0
Refinery Operations [Member]
Revenues from operations		55,795		68,548	138,663		158,463
Refinery Operations [Member] | Operating Segments [Member]
Revenues from operations		55,795		68,548	138,663		158,463
Crude oil, fuel use, and chemicals		50,669		64,820	125,245		141,489
Other conversion costs		5,154		9,058	8,002		11,674
Tolling and terminaling costs		0		0	0		0
Depreciation and amortization		301		301	599		602
Total costs of goods sold		56,124		74,179	133,846		153,765
LEH operating fee, related party		276		254	458		426
General and administrative expenses		580		391	919		628
Other operating expenses	[1]	0		0	0		0
Depreciation and amortization		0		0	0		0
Interest, net		928		806	1,764		1,540
Total costs and expenses		57,908		75,630	136,987		156,359
Income (loss) before income taxes		(2,113)		(7,082)	1,676		2,104
Income tax benefit (expense)		0		0	0		0
Net income		(2,113)		(7,082)	1,676		2,104
Tolling and Terminaling [Member]
Revenues from operations		788		1,111	1,612		2,218
Tolling and Terminaling [Member] | Operating Segments [Member]
Revenues from operations		1,361		1,684	2,752		3,294
Crude oil, fuel use, and chemicals		0		0	0		0
Other conversion costs		0		0	0		0
Tolling and terminaling costs		140		410	262		820
Depreciation and amortization		342		342	684		684
Total costs of goods sold		482		752	946		1,504
LEH operating fee, related party		0		0	0		0
General and administrative expenses		72		69	160		92
Other operating expenses	[1]	0		0	0		0
Depreciation and amortization		0		0	0		0
Interest, net		444		497	921		993
Total costs and expenses		998		1,318	2,027		2,589
Income (loss) before income taxes		363		366	725		705
Income tax benefit (expense)		0		0	0		0
Net income		$ 363		$ 366	$ 725		$ 705

[1] Includes costs and expenses associated with our pipeline and facilities assets.

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