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Pay vs Performance Disclosure - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pay vs Performance Disclosure          
Pay vs Performance Disclosure, Table
Year (a)Summary
Compensation
Table Total
for CEO
(b)		Compensation
Actually
Paid to CEO
(c)
Average
Summary
Compensation
Table Total for
non-CEO
NEOs
(d)
Average
Compensation
Actually Paid
to non-CEO
NEOs
(e)		Value of Initial Fixed
$100 Investment Based On:		Net Income
(In Millions)
(h)
Diluted
Earnings Per
Share
(i)
Total
Shareholder
Return
(f)
Peer Group
Total
Shareholder
Return
(g)
2025$1,906,024 $1,568,150 $693,760 $676,245 $76.09 $87.73 $42.80 $2.32 
2024$1,828,153 $1,578,153 $616,182 $411,477 $89.61 $91.21 $44.40 $2.47 
2023$1,758,814 $1,414,050 $673,736 $467,470 $109.30 $103.30 $31.50 $1.76 
2022$1,154,726 $38,876 $452,477 $284,597 $128.86 $120.09 $42.40 $2.39 
2021$1,290,444 $3,173,051 $490,567 $782,328 $194.55 $132.98 $36.50 $2.07 
        
Named Executive Officers, Footnote
Column (b) Reflects compensation amounts reported in the “Summary Compensation Table” for Mr. Dennis Doll, for the fiscal years 2023, 2022 and, 2021; and for Ms. Leslie annualized compensation amount for 2024.
        
Peer Group Issuers, Footnote
Column (g) For the relevant fiscal year, represents the cumulative TSR of the Peer Group for the measurement periods ended on December 31 of each of 2025, 2024, 2023, 2022, and 2021, respectively. Peer Group companies currently include American States Water Company, Artesian Resources Corp., California Water Service Group, Global Water Resources Inc., H2O America, and York Water Company.
        
PEO Total Compensation Amount $ 1,906,024 $ 1,828,153 $ 1,758,814 $ 1,154,726 $ 1,290,444
PEO Actually Paid Compensation Amount $ 1,568,150 1,578,153 1,414,050 38,876 3,173,051
Adjustment To PEO Compensation, Footnote
Column (c) “Compensation actually paid” to Mr. Doll in each of 2023, 2022, and 2021, and for Ms. Leslie in 2024 and 2025, reflects the respective amounts set forth in column (b) of the compensation table above, adjusted as set forth in the compensation calculation table below, as determined in accordance with SEC rules. The dollar amounts reflected in column (b) of the table above do not reflect the actual amount of compensation earned by or paid to our CEO during the applicable year. For information regarding the decisions made by our Compensation Committee in regards to the CEO’s compensation for each fiscal year, please see the CD&A sections of the Proxy Statements reporting pay for the fiscal years covered in the table above.
YearSummary
Compensation
Table Total
for CEO		Summary
Compensation
Table Equity
Awards for CEO		Equity
Awards
Adjustment
for CEO		Summary
Compensation
Table Change
in Pension
Value for CEO		Pension
Service Cost
Adjustment
for CEO		Total
Compensation
Actually
Paid to CEO
2025$1,906,024 $(678,000)$340,126 $— $— $1,568,150 
2024$1,828,153 (250,000)$— $— $— $1,578,153 
2023$1,758,814 $— $21,252 $(630,526)$264,510 $1,414,050 
2022$1,154,726 $(400,000)$(1,008,164)$— $292,314 $38,876 
2021$1,290,444 $(400,000)$2,176,122 $(174,119)$280,604 $3,173,051 
Fair Value of Equity Awards for CEO20252024202320222021
Year End Fair Value of Current Year Equity Award$340,126 $— $338,140 $299,182 $608,959 
Year End Change in Fair Value of Prior Year Equity Awards$— $— $(307,889)$(1,184,082)$1,507,984 
Change in Fair Value of Prior Year Equity Awards Vesting in Current Year$— $— $(8,999)$(123,264)$59,179 
Total Equity Awards Adjustments for CEO$340,126 $— $21,252 $(1,008,164)$2,176,122 
        
Non-PEO NEO Average Total Compensation Amount $ 693,760 616,182 673,736 452,477 490,567
Non-PEO NEO Average Compensation Actually Paid Amount $ 676,245 411,477 467,470 284,597 782,328
Adjustment to Non-PEO NEO Compensation Footnote
Column (e) Average “compensation actually paid” for our non-CEO NEOs in each of 2025, 2024, 2023, 2022, and 2021 reflects the respective amounts set forth in column (d) of the table above, adjusted as set forth in the compensation calculation table below, as determined in accordance with SEC rules. The dollar amounts reflected in column (d) of the table above do not reflect the actual amount of compensation earned by or paid to our non-CEO NEOs during the applicable year. For information regarding the decisions made by our Compensation Committee in regards to the non-CEO NEOs compensation for each fiscal year, please see the CD&A sections of the Proxy Statements reporting pay for the fiscal years covered in the table above.
YearAverage
Summary
Compensation
Table Total for
non-CEO NEOs		Average Summary
Compensation
Table Equity
Awards for
non-CEO NEOs		Average
Equity Awards
Adjustment for
non-CEO NEOs		Average Summary
Compensation
Table Change in
Pension Value for
non-CEO NEOs		Average Pension
Service Cost
Adjustment for
non-CEO NEOs		Average Total
Compensation
Actually Paid to
non-CEO NEOs
2025$693,760 $(93,750)$76,235 $— $— $676,245 
2024$616,182 $(114,000)$(21,535)$(80,489)$11,320 $411,477 
2023$673,736 $(45,064)$22,748 $(196,877)$12,926 $467,470 
2022$452,477 $(92,500)$(120,479)$— $45,098 $284,597 
2021$490,567 $(88,750)$390,457 $(78,407)$68,461 $782,328 
Fair Value of Equity Awards for non-CEO NEOs20252024202320222021
Year End Fair Value of Current Year Equity Award$74,500 $36,136 $78,203 $67,342 $135,097 
Year End Change in Fair Value of Prior Year Equity Awards$(2,664)$(23,073)$(54,533)$(175,221)$246,026 
Change in Fair Value of Prior Year Equity Awards Vesting in Current Year$4,399 $(34,598)$(922)$(12,600)$9,334 
Total Equity Awards Adjustments non-CEO NEOs$76,235 $(21,535)$22,748 $(120,479)$390,457 
        
Compensation Actually Paid vs. Total Shareholder Return
CAP VS. TSR
3848290701847
¢
CAP to PEO
¢
Avg. CAP to non-PEO NEOs
02_PRO014926_LineCyan.jpg 
MSEX TSR
02_PRO014926_LineGreen.jpg 
Peer Group TSR
        
Compensation Actually Paid vs. Net Income
CAP VS. NET INCOME AND DILUTED EARNINGS PER SHARE
982
¢
CAP to PEO
¢
Avg. CAP to non-PEO NEOs
02_PRO014926_LineCyan.jpg 
Net Income
02_PRO014926_LineGreen.jpg 
Diluted Earnings Per Share
        
Compensation Actually Paid vs. Company Selected Measure
CAP VS. NET INCOME AND DILUTED EARNINGS PER SHARE
982
¢
CAP to PEO
¢
Avg. CAP to non-PEO NEOs
02_PRO014926_LineCyan.jpg 
Net Income
02_PRO014926_LineGreen.jpg 
Diluted Earnings Per Share
        
Total Shareholder Return Vs Peer Group
CAP VS. TSR
3848290701847
¢
CAP to PEO
¢
Avg. CAP to non-PEO NEOs
02_PRO014926_LineCyan.jpg 
MSEX TSR
02_PRO014926_LineGreen.jpg 
Peer Group TSR
        
Tabular List, Table
The following performance measures represent the most important financial and non-financial performance measures used by us to link compensation actually paid to our NEOs to performance for the fiscal year ended December 31, 2025:
•Diluted earnings per share;
•Net income;
•Capital investment delivery;
•Employee engagement and satisfaction;
•Customer experience; and
•Safety metrics
        
Total Shareholder Return Amount $ 76.09 89.61 109.30 128.86 194.55
Peer Group Total Shareholder Return Amount 87.73 91.21 103.30 120.09 132.98
Net Income (Loss) $ 42.80 $ 44.40 $ 31.50 $ 42.40 $ 36.50
Company Selected Measure Amount 2.32 2.47 1.76 2.39 2.07
PEO Name Ms. Leslie Ms. Leslie Mr. Dennis Doll, Mr. Dennis Doll, Mr. Dennis Doll,
Additional 402(v) Disclosure
Column (d) Reflects compensation information for our NEOs other than the CEO as described in the CD&A of this Proxy Statement. 2025: Mohammed G. Zerhouni, Gregory S. Sorensen, Jay L. Kooper, Georgia M. Simpson. 2024: Mohammed G. Zerhouni, A. Bruce O’Connor, Jay L. Kooper, Georgia M. Simpson, Robert K. Fullagar. 2023 A. Bruce O’Connor, Jay L. Kooper, Georgia M. Simpson, Robert K. Fullagar. 2022: A. Bruce O’Connor, Jay L. Kooper, Georgia M. Simpson, Robert K. Fullagar. 2021: A. Bruce O’Connor, Bernadette M. Sohler, Jay L. Kooper, Lorrie B. Ginegaw.
Column (f) For the relevant fiscal year, represents the cumulative total shareholder return (TSR) of Middlesex for the measurement periods ended on December 31 of each of 2025, 2024, 2023, 2022, and 2021, respectively.
Column (h) Source: Company’s Annual Report on Form 10-K for each respective year.
Column (i) Source: Company’s Annual Report on Form 10-K for each respective year 		       
Measure:: 1          
Pay vs Performance Disclosure          
Name Diluted earnings per share        
Measure:: 2          
Pay vs Performance Disclosure          
Name Net income        
Measure:: 3          
Pay vs Performance Disclosure          
Name Capital investment delivery        
Measure:: 4          
Pay vs Performance Disclosure          
Name Employee engagement and satisfaction        
Measure:: 5          
Pay vs Performance Disclosure          
Name Customer experience        
Measure:: 6          
Pay vs Performance Disclosure          
Name Safety metrics        
PEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ 0 $ 0 $ (630,526) $ 0 $ (174,119)
PEO | Aggregate Pension Adjustments Service Cost          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0 0 264,510 292,314 280,604
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (678,000) (250,000) 0 (400,000) (400,000)
PEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 340,126 0 21,252 (1,008,164) 2,176,122
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 340,126 0 338,140 299,182 608,959
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0 0 (307,889) (1,184,082) 1,507,984
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0 0 (8,999) (123,264) 59,179
Non-PEO NEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0 (80,489) (196,877) 0 (78,407)
Non-PEO NEO | Aggregate Pension Adjustments Service Cost          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 0 11,320 12,926 45,098 68,461
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (93,750) (114,000) (45,064) (92,500) (88,750)
Non-PEO NEO | Equity Awards Adjustments, Excluding Value Reported in Compensation Table          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 76,235 (21,535) 22,748 (120,479) 390,457
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 74,500 36,136 78,203 67,342 135,097
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (2,664) (23,073) (54,533) (175,221) 246,026
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ 4,399 $ (34,598) $ (922) $ (12,600) $ 9,334