Note 4 - Discontinued Operations - Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Total liabilities of discontinued operations					$ 240
Net income (loss) from discontinued operations	$ 0	$ 175	$ 0	$ 75,725
Discontinued Operations, Held-for-sale [Member]
(Gain) loss on disposal of assets		(69)		(75,138)
Interest expense		1		707
Tangible asset impairment expense				156
Discontinued Operations, Disposed of by Sale [Member]
Other assets					2
Total assets of discontinued operations					2
Current liabilities					240
Operating expense		805		4,487
General and administrative expense		8		184
Income (loss) before income taxes		175		75,725
Provision for income taxes		0		0
Net income (loss) from discontinued operations		175		75,725
Amortization				48
Capital expenditures				136
Discontinued Operations, Disposed of by Sale [Member] | Intersegment Eliminations [Member]
Operating expense				409
Crude Oil Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member]
Operating expense		93		1,426
General and administrative expense		2		61
(Gain) loss on disposal of assets		0		(3)
Interest expense		0		0
Income (loss) before income taxes		(95)		(1,158)
Provision for income taxes		0		0
Net income (loss) from discontinued operations		(95)		(1,158)
Tangible asset impairment expense				92
Amortization				3
Capital expenditures				0
Crude Oil Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member] | Intersegment Eliminations [Member]
Operating expense				0
Crude Oil Trucking Services [Member] | Discontinued Operations, Disposed of by Sale [Member]
Other assets					0
Total assets of discontinued operations					0
Current liabilities					12
Total liabilities of discontinued operations					12
Crude Oil Pipeline Services [Member] | Discontinued Operations, Held-for-sale [Member]
Operating expense		116		1,554
General and administrative expense		6		123
(Gain) loss on disposal of assets		50		(1,644)
Interest expense		0		72
Income (loss) before income taxes		(50)		1,116
Provision for income taxes		0		0
Net income (loss) from discontinued operations		(50)		1,116
Tangible asset impairment expense				41
Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member]
Other assets					1
Total assets of discontinued operations					1
Current liabilities					218
Total liabilities of discontinued operations					218
Amortization				14
Capital expenditures				30
Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member] | Intersegment Eliminations [Member]
Operating expense				409
Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member]
Operating expense		596		1,507
General and administrative expense		0		0
(Gain) loss on disposal of assets		(119)		(73,491)
Interest expense		1		635
Income (loss) before income taxes		320		75,767
Provision for income taxes		0		0
Net income (loss) from discontinued operations		320		75,767
Tangible asset impairment expense				23
Amortization				31
Capital expenditures				106
Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member] | Intersegment Eliminations [Member]
Operating expense				0
Crude Oil Terminalling Services [Member] | Discontinued Operations, Disposed of by Sale [Member]
Other assets					1
Total assets of discontinued operations					1
Current liabilities					10
Total liabilities of discontinued operations					$ 10
Third Party [Member] | Discontinued Operations, Disposed of by Sale [Member]
Cost of product sales				4,994
Third Party [Member] | Crude Oil Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member]
Cost of product sales				0
Third Party [Member] | Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member]
Cost of product sales				4,994
Third Party [Member] | Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member]
Cost of product sales				0
Related Party [Member] | Discontinued Operations, Disposed of by Sale [Member]
Cost of product sales				9,461
Related Party [Member] | Crude Oil Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member]
Cost of product sales				0
Related Party [Member] | Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member]
Cost of product sales				9,461
Related Party [Member] | Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member]
Cost of product sales				0
Service [Member] | Discontinued Operations, Disposed of by Sale [Member] | Intersegment Eliminations [Member]
Revenue				409
Service [Member] | Crude Oil Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member] | Intersegment Eliminations [Member]
Revenue				409
Service [Member] | Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member] | Intersegment Eliminations [Member]
Revenue				0
Service [Member] | Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member] | Intersegment Eliminations [Member]
Revenue				0
Service [Member] | Third Party [Member] | Discontinued Operations, Disposed of by Sale [Member]
Revenue		920		4,985
Service [Member] | Third Party [Member] | Crude Oil Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member]
Revenue		0		9
Service [Member] | Third Party [Member] | Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member]
Revenue		122		535
Service [Member] | Third Party [Member] | Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member]
Revenue		$ 798		4,441
Product [Member] | Third Party [Member] | Discontinued Operations, Disposed of by Sale [Member]
Revenue				15,591
Product [Member] | Third Party [Member] | Crude Oil Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member]
Revenue				0
Product [Member] | Third Party [Member] | Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member]
Revenue				15,591
Product [Member] | Third Party [Member] | Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member]
Revenue				$ 0