The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets (Details) - USD ($) $ in Thousands			12 Months Ended
Intangible Assets (Details) - USD ($) $ in Thousands	May 17, 2020	May 06, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets, Net
Amortization of intangible assets			$ 800	$ 600	$ 200
Customer Relationships
Finite-Lived Intangible Assets, Net
Gross Value			4,876	4,876
Accumulated Amortization			(1,559)	(770)
Net			3,317	4,106
Useful life		7 years
Finite-Lived Intangible Assets, Net, Amortization Expense
2022			737
2023			687
2024			637
2025			606
2026			460
Customer Relationships \| EH Trucking
Finite-Lived Intangible Assets, Net
Gross Value			1,703	1,703
Accumulated Amortization			(765)	(500)
Net			938	1,203
Useful life		7 years
Finite-Lived Intangible Assets, Net, Amortization Expense
2022			245
2023			227
2024			209
2025			193
2026			63
Customer Relationships \| Comcar
Finite-Lived Intangible Assets, Net
Gross Value			3,173	3,173
Accumulated Amortization			(794)	(270)
Net			2,379	$ 2,903
Useful life	7 years
Finite-Lived Intangible Assets, Net, Amortization Expense
2022			492
2023			460
2024			428
2025			413
2026			$ 397