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Stock-Based Compensation Plans 2 (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Additional disclosure      
Vesting period 3 years    
Unrecognized compensation cost $ 272    
Weighted Average Grant-Date Value      
Capitalized equity-based compensation cost $ 450 $ 290 $ 336
Maximum      
Additional disclosure      
Percentage of target amount of performance shares 200.00%    
Minimum      
Additional disclosure      
Percentage of target amount of performance shares 0.00%    
Weighted Average      
Additional disclosure      
Expected recognition period for unrecognized compensation cost 1 year 6 months    
Restricted Stock Units      
Additional disclosure      
Unrecognized compensation cost related to performance awards $ 622    
Number of Restricted/Performance Share Units      
Restricted share units at the beginning of the period (in shares) 47,552    
Granted (in shares) 19,837    
Vested (in shares) (16,574)    
Forfeited (in shares) (488)    
Restricted share units at the end of the period (in shares) 50,327 47,552  
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 49.01    
Granted (in dollars per share) 94.71    
Vested (in dollars per share) 87.28    
Forfeited (in dollars per share) 92.84    
Restricted share units at the end of the period (in dollars per share) $ 54.00 $ 49.01  
Performance awards      
Additional disclosure      
Vesting period 3 years    
Period to meet the performance goals 3 years    
Number of Restricted/Performance Share Units      
Restricted share units at the beginning of the period (in shares) 49,435    
Granted (in shares) 19,696    
Performance criteria adjustment (in shares) 8,321    
Vested (in shares) (12,095)    
Restricted share units at the end of the period (in shares) 65,357 49,435  
Weighted Average Grant-Date Value      
Restricted share units at the beginning of the period (in dollars per share) $ 83.70    
Granted (in dollars per share) 96.04    
Performance criteria adjustment (in dollars per share) 91.73    
Vested (in dollars per share) 89.59    
Restricted share units at the end of the period (in dollars per share) $ 87.35 $ 83.70  
Performance awards | 2000 and 2008 Employee Plans      
Additional disclosure      
Vesting period 3 years    
GSWC      
Weighted Average Grant-Date Value      
Capitalized equity-based compensation cost $ 450 $ 290 $ 336
American States Utility Services | Maximum      
Additional disclosure      
Percentage of target amount of performance shares 250.00%