Note 4 - Discontinued Operations - Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Total liabilities of discontinued operations			$ 240
Net income (loss) from discontinued operations	$ 0	$ 75,550
Discontinued Operations, Disposed of by Sale [Member]
Other assets			2
Total assets of discontinued operations			2
Current liabilities			240
Operating expense		3,681
General and administrative expense		177
Income (loss) before income taxes		75,550
Provision for income taxes		0
Net income (loss) from discontinued operations		75,550
Amortization		32
Capital expenditures		119
Discontinued Operations, Disposed of by Sale [Member] | Intersegment Eliminations [Member]
Operating expense		409
Discontinued Operations, Disposed of by Sale [Member] | Third Party [Member]
Cost of product sales		4,994
Discontinued Operations, Disposed of by Sale [Member] | Related Party [Member]
Cost of product sales		9,461
Discontinued Operations, Disposed of by Sale [Member] | Service [Member] | Intersegment Eliminations [Member]
Revenue		409
Discontinued Operations, Disposed of by Sale [Member] | Service [Member] | Third Party [Member]
Revenue		4,065
Discontinued Operations, Disposed of by Sale [Member] | Product [Member] | Third Party [Member]
Revenue		15,591
Discontinued Operations, Held-for-sale [Member]
Tangible asset impairment expense		156
Gain on disposal of assets		(75,069)
Interest expense		706
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 Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member]
Operating expense		1,333
General and administrative expense		59
Tangible asset impairment expense		92
Gain on disposal of assets		(3)
Interest expense		0
Income (loss) before income taxes		(1,063)
Provision for income taxes		0
Net income (loss) from discontinued operations		(1,063)
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, Held-for-sale [Member] | Third Party [Member]
Cost of product sales		0
Crude Oil Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member] | Related Party [Member]
Cost of product sales		0
Crude Oil Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member] | Service [Member] | Intersegment Eliminations [Member]
Revenue		409
Crude Oil Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member] | Service [Member] | Third Party [Member]
Revenue		9
Crude Oil Trucking Services [Member] | Discontinued Operations, Held-for-sale [Member] | Product [Member] | Third Party [Member]
Revenue		0
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		10
Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member] | Intersegment Eliminations [Member]
Operating expense		409
Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member] | Third Party [Member]
Cost of product sales		4,994
Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member] | Related Party [Member]
Cost of product sales		9,461
Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member] | Service [Member] | Intersegment Eliminations [Member]
Revenue		0
Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member] | Service [Member] | Third Party [Member]
Revenue		413
Crude Oil Pipeline Services [Member] | Discontinued Operations, Disposed of by Sale [Member] | Product [Member] | Third Party [Member]
Revenue		15,591
Crude Oil Pipeline Services [Member] | Discontinued Operations, Held-for-sale [Member]
Operating expense		1,438
General and administrative expense		118
Tangible asset impairment expense		41
Gain on disposal of assets		(1,694)
Interest expense		72
Income (loss) before income taxes		1,165
Provision for income taxes		0
Net income (loss) from discontinued operations		1,165
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
Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member]
Operating expense		910
General and administrative expense		0
Tangible asset impairment expense		23
Gain on disposal of assets		(73,372)
Interest expense		634
Income (loss) before income taxes		75,448
Provision for income taxes		0
Net income (loss) from discontinued operations		75,448
Amortization		15
Capital expenditures		109
Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member] | Intersegment Eliminations [Member]
Operating expense		0
Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member] | Third Party [Member]
Cost of product sales		0
Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member] | Related Party [Member]
Cost of product sales		0
Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member] | Service [Member] | Intersegment Eliminations [Member]
Revenue		0
Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member] | Service [Member] | Third Party [Member]
Revenue		3,643
Crude Oil Terminalling Services [Member] | Discontinued Operations, Held-for-sale [Member] | Product [Member] | Third Party [Member]
Revenue		$ 0