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REVENUE RECOGNITION, Disaggregated Revenues (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Contract
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
REVENUE RECOGNITION [Abstract]        
Minimum number of days due for accounts receivable from tariff contract customers     25 days  
Reserve or reduction to revenue $ 0 $ 0 $ 0 $ 0
Minimum number of days due for accounts receivable from SLP Plan customer     25 days  
Minimum number of days customers services invoiced in advance     30 days  
Number of operation contracts paid in advance | Contract 1      
Disaggregation of Revenue [Abstract]        
Other Operating Revenue not in scope of ASC 606 $ 421 419 $ 1,197 1,180
Revenues 29,142 26,570 81,102 74,317
Tariff Revenue [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 26,876 24,272 74,430 67,693
Tariff Revenue [Member] | Consumption Charges [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 16,747 13,681 44,232 37,064
Tariff Revenue [Member] | Fixed Fees [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 9,156 8,299 27,578 24,365
Tariff Revenue [Member] | Service Charges [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 186 169 565 523
Tariff Revenue [Member] | DSIC [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 67 1,403 67 3,922
Tariff Revenue [Member] | Metered Wastewater Services [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 253 183 598 435
Tariff Revenue [Member] | Industrial Wastewater Services [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 467 537 1,390 1,384
Non-Tariff Revenue [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 1,845 1,879 5,475 5,444
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 1,468 1,441 4,323 4,176
Non-Tariff Revenue [Member] | Contract Operations [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 255 272 760 793
Non-Tariff Revenue [Member] | Design and Installation [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 2 28 61 150
Non-Tariff Revenue [Member] | Inspection Fees [Member]        
Disaggregation of Revenue [Abstract]        
Revenues $ 120 $ 138 $ 331 $ 325