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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2022
Feb. 24, 2023
Jun. 30, 2022
Document Information Line Items      
Entity Registrant Name MIDDLESEX WATER COMPANY    
Trading Symbol MSEX    
Document Type 10-K    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   17,642,147  
Entity Public Float     $ 1,505,071,215
Amendment Flag false    
Entity Central Index Key 0000066004    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Document Period End Date Dec. 31, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Document Annual Report true    
Document Transition Report false    
Entity File Number 0-422    
Entity Incorporation, State or Country Code NJ    
Entity Tax Identification Number 22-1114430    
Entity Address, Address Line One 485C Route 1 South    
Entity Address, Address Line Two Suite 400    
Entity Address, City or Town Iselin    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 08830    
City Area Code (732)    
Local Phone Number 634-1500    
Title of 12(b) Security Common Stock, No Par Value    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
Auditor Name Baker Tilly US, LLP    
Auditor Location Philadelphia    
Auditor Firm ID 23