| Cover | Oct. 21, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | The current report on Form 8-K/A (the “Amendment”) serves to amend the Form 8-K (the “Original Form 8-K”) of Middlesex Water Company (the “Company”) originally furnished to the U.S. Securities and Exchange Commission on October 21, 2022 which incorrectly listed the common dividend increase at 7.6% and was included in the Company’s press release issued on October 21, 2022 and furnished as Exhibit 99.1 to the Original 8-K Item 8.01 Other Events. The Original Form 8-K reported a 7.6% increase in the common dividend when it should be 7.76%. No other changes have been made to the Original Form 8-K. |
| Document Period End Date | Oct. 21, 2022 |
| Entity File Number | 0-422 |
| Entity Registrant Name | MIDDLESEX WATER COMPANY |
| Entity Central Index Key | 0000066004 |
| Entity Tax Identification Number | 22-1114430 |
| Entity Incorporation, State or Country Code | NJ |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | MSEX |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
