Note 1 - Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Current Ownership Hierarchy [Table Text Block]

Name	State of Formation	Ownership	Business
Heat Waves Hot Oil Service LLC	Colorado	100% by Enservco	Oil and natural gas well services, including logistics and stimulation.
Adler Hot Oil Service, LLC	Delaware	100% by Enservco	Operations integrated into Heat Waves during 2019. Adler Hot Oil Service, LLC was dissolved during the second quarter of 2021.
Heat Waves Water Management LLC	Colorado	100% by Enservco	Discontinued operations in 2019. Heat Waves Water Management LLC was dissolved during the second quarter of 2021.
Dillco Fluid Service, Inc.	Kansas	100% by Enservco	Discontinued operation in 2018. Dillco Fluid Service, Inc. was dissolved during the second quarter of 2021.
HE Services LLC	Nevada	100% by Heat Waves	No active business operations. Owned construction equipment used by Heat Waves. HE Services LLC was dissolved on December 23, 2020.