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CONDENSED CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Retained Earnings
Balance at beginning of period (in shares) at Dec. 31, 2023   17,821,000  
Balance at beginning of period at Dec. 31, 2023 $ 422,991 $ 246,764 $ 176,227
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net Income 10,682   10,682
Middlesex Water Company Investment Plan (in shares)   5,000  
Middlesex Water Company Investment Plan 252 $ 252  
Restricted Stock Award - Net - Employees (in shares)   (12,000)  
Restricted Stock Award - Net - Employees (465) $ (465)  
Cash Dividends on Common Stock ($0.3250 per share) (5,738)   (5,738)
Cash Dividends on Preferred Stock (30)   (30)
Balance at end of period (in shares) at Mar. 31, 2024   17,814,000  
Balance at end of period at Mar. 31, 2024 $ 427,692 $ 246,551 181,141
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cash dividends on Common Stock (in dollars per share) $ 0.3250    
Balance at beginning of period (in shares) at Dec. 31, 2023   17,821,000  
Balance at beginning of period at Dec. 31, 2023 $ 422,991 $ 246,764 176,227
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net Income 35,547    
At-The-Market Program Common Stock Issuance (in shares)   13,498  
At-The-Market Program Common Stock Issuance   $ 700  
Balance at end of period (in shares) at Sep. 30, 2024   17,855,000  
Balance at end of period at Sep. 30, 2024 441,935 $ 247,576 194,359
Balance at beginning of period (in shares) at Mar. 31, 2024   17,814,000  
Balance at beginning of period at Mar. 31, 2024 427,692 $ 246,551 181,141
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net Income 10,546   10,546
Middlesex Water Company Investment Plan (in shares)   5,000  
Middlesex Water Company Investment Plan 253 $ 253  
Restricted Stock Award - Net - Employees (in shares)   3,000  
Restricted Stock Award - Net - Employees (187) $ (187)  
Restricted Stock Award - Board of Directors (in shares)   7,000  
Restricted Stock Award - Board of Directors 397 $ 397  
Cash Dividends on Common Stock ($0.3250 per share) (5,793)   (5,793)
Cash Dividends on Preferred Stock (30)   (30)
Balance at end of period (in shares) at Jun. 30, 2024   17,829,000  
Balance at end of period at Jun. 30, 2024 $ 432,878 $ 247,014 185,864
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cash dividends on Common Stock (in dollars per share) $ 0.3250    
Net Income $ 14,319   14,319
Middlesex Water Company Investment Plan (in shares)   4,000  
Middlesex Water Company Investment Plan 235 $ 235  
Restricted Stock Award - Net - Employees 133 $ 133  
Conversion of $7 Preferred Stock to Common Stock (in shares)   22,000  
Conversion of $7 Preferred Stock to Common Stock 194 $ 194  
Cash Dividends on Common Stock ($0.3250 per share) (5,795)   (5,795)
Cash Dividends on Preferred Stock (29)   (29)
Balance at end of period (in shares) at Sep. 30, 2024   17,855,000  
Balance at end of period at Sep. 30, 2024 $ 441,935 $ 247,576 194,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cash dividends on Common Stock (in dollars per share) $ 0.3250    
Convertible preferred stock, conversion price (in dollars per share) $ 7.00    
Balance at beginning of period (in shares) at Dec. 31, 2024   17,887,000  
Balance at beginning of period at Dec. 31, 2024 $ 445,263 $ 248,202 197,061
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net Income 9,479   9,479
Middlesex Water Company Investment Plan (in shares)   4,000  
Middlesex Water Company Investment Plan 221 $ 221  
Restricted Stock Award - Net - Employees (in shares)   1,000  
Restricted Stock Award - Net - Employees 167 $ 167  
Conversion of $7 Preferred Stock to Common Stock (in shares)   2,000  
Conversion of $7 Preferred Stock to Common Stock 21 $ 21  
Cash Dividends on Common Stock ($0.3250 per share) (6,081)   (6,081)
Cash Dividends on Preferred Stock (22)   (22)
Balance at end of period (in shares) at Mar. 31, 2025   17,894,000  
Balance at end of period at Mar. 31, 2025 $ 449,048 $ 248,611 200,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cash dividends on Common Stock (in dollars per share) $ 0.3400    
Balance at beginning of period (in shares) at Dec. 31, 2024   17,887,000  
Balance at beginning of period at Dec. 31, 2024 $ 445,263 $ 248,202 197,061
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net Income 34,217    
At-The-Market Program Common Stock Issuance (in shares)   12,522  
At-The-Market Program Common Stock Issuance   $ 700  
Balance at end of period (in shares) at Sep. 30, 2025   18,337,000  
Balance at end of period at Sep. 30, 2025 $ 482,546 $ 269,636 212,910
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Convertible preferred stock, conversion price (in dollars per share) $ 7    
Balance at beginning of period (in shares) at Mar. 31, 2025   17,894,000  
Balance at beginning of period at Mar. 31, 2025 $ 449,048 $ 248,611 200,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Net Income 10,778   10,778
Middlesex Water Company Investment Plan (in shares)   4,000  
Middlesex Water Company Investment Plan 229 $ 229  
Restricted Stock Award - Net - Employees (in shares)   18,000  
Restricted Stock Award - Net - Employees 47 $ 47  
Restricted Stock Award - Board of Directors (in shares)   6,000  
Restricted Stock Award - Board of Directors 366 $ 366  
Conversion of $7 Preferred Stock to Common Stock (in shares)   30,000  
Conversion of $7 Preferred Stock to Common Stock 262 $ 262  
At-The-Market Program Common Stock Issuance (in shares)   64,000  
At-The-Market Program Common Stock Issuance 3,604 $ 3,604  
Common Stock Issuance Expense (431) $ (431)  
Cash Dividends on Common Stock ($0.3250 per share) (6,101)   (6,101)
Cash Dividends on Preferred Stock (19)   (19)
Balance at end of period (in shares) at Jun. 30, 2025   18,016,000  
Balance at end of period at Jun. 30, 2025 $ 457,783 $ 252,688 205,095
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cash dividends on Common Stock (in dollars per share) $ 0.3400    
Convertible preferred stock, conversion price (in dollars per share) $ 7    
Net Income $ 13,958   13,958
Middlesex Water Company Investment Plan (in shares)   4,000  
Middlesex Water Company Investment Plan 235 $ 235  
Restricted Stock Award - Net - Employees 161 $ 161  
At-The-Market Program Common Stock Issuance (in shares)   317,000  
At-The-Market Program Common Stock Issuance 16,992 $ 16,992  
Common Stock Issuance Expense (440) $ (440)  
Cash Dividends on Common Stock ($0.3250 per share) (6,125)   (6,125)
Cash Dividends on Preferred Stock (18)   (18)
Balance at end of period (in shares) at Sep. 30, 2025   18,337,000  
Balance at end of period at Sep. 30, 2025 $ 482,546 $ 269,636 $ 212,910
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Cash dividends on Common Stock (in dollars per share) $ 0.3400    
Convertible preferred stock, conversion price (in dollars per share) $ 7.00