Note 2 - Restatement of Previously Issued Financial Statements (Details Textual) - shares	3 Months Ended	6 Months Ended
Mar. 31, 2021	Jun. 30, 2021
Change in Control Pursuant to Issuance of Common Stock, Shares (in shares)	4,199,998	4,199,998

Represents common stock shares related to change in control pursuant to issuance of common stock.

No definition available.

Name:	ensv_ChangeInControlPursuantToIssuanceOfCommonStockShares
Namespace Prefix:	ensv_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration