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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 26, 2025
Jun. 30, 2024
Document Information Line Items      
Entity Central Index Key 0000066004    
Document Type 10-K/A    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Transition Report false    
Entity File Number 0-422    
Entity Registrant Name MIDDLESEX WATER COMPANY    
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    
Trading Symbol MSEX    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 906,502,416
Entity Common Stock, Shares Outstanding   17,887,454  
Documents Incorporated by Reference [Text Block]

Proxy Statement to be filed in connection with the Registrant’s Annual Meeting of Stockholders to be held on May 20, 2025, which will be filed with the Securities and Exchange Commission within 120 days of the end of our 2024 fiscal year, is incorporated by reference into Part III of this Annual Report on Form 10-K to the extent described herein.

    
Amendment Description Middlesex Water Company (the Company) is filing this Amendment No. 1 to the Annual Report on Form 10-K (this Form 10-K/A) for the fiscal year ended December 31, 2024, originally filed with the Securities and Exchange Commission (the SEC) on February 28, 2025 (the 2024 Form 10-K) to make certain non-substantive changes described below.Subsequent to the filing of the Company’s 2024 Form 10-K with the SEC, the Company identified a clerical error omitting the conformed electronic signature of Baker Tilly US, LLP (Baker Tilly) (PCAOB ID 23) in the Report of the Independent Registered Public Accounting Firm (the Report). Notwithstanding the inadvertent omission of the conformed electronic signature, the original Report was dated and signed by Baker Tilly, and received by the Company on February 28, 2025, prior to the filing of the Company’s 2024 Form 10-K with the SEC.In accordance with Rule 12b-15 of the Securities Exchange Act of 1934, as amended (the Exchange Act), this Form 10-K/A is being filed to (i) replace the Report with the audit report included in Part II, Item 8 to include Baker Tilly’s conformed electronic signature and (ii) amend Part IV - Item 15 Exhibits and Financial Statement Schedules to replace Baker Tilly’s consent of independent registered public accounting firm dated February 28, 2025 with an updated consent of independent registered public accounting firm and include currently dated certifications from the Company’s Chief Executive Officer and Chief Financial Officer as required by Section 302 and 906 of the Sarbanes-Oxley Act of 2002.Please note that the only changes to the 2024 Form 10-K are those non-substantive changes described herein and only in the Items listed above. Except as described above, no changes have been made to the 2024 Form 10-K, and this Form 10-K/A does not modify, amend or update any of the other financial information or other information contained in the 2024 Form 10-K. In addition, in accordance with SEC rules, this Form 10-K/A includes an updated auditor consent as Exhibit 23.1 and updated certifications from our Chief Executive Officer and Chief Financial Officer as Exhibits 31, 31.1, 32 and 32.1. Except for the foregoing changes, the information in this Form 10-K/A is as of February 28, 2025, the filing date of the original Form 10-K for the year ended December 31, 2024, and has not been updated for the events subsequent to that date other than as discussed above.    
Auditor Firm ID 23    
Auditor Opinion [Text Block]

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets and consolidated statements of capital stock and long-term debt of Middlesex Water Company (the "Company") as of December 31, 2024 and 2023, the related consolidated statements of income, common stockholders' equity, and cash flows for each of the three years in the period ended December 31, 2024, and the related notes (collectively referred to as the "consolidated financial statements"). We also have audited the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework: (2013) issued by COSO.

    
Auditor Name Baker Tilly US, LLP    
Auditor Location Philadelphia, Pennsylvania    
Amendment Flag true    
Document Fiscal Period Focus FY