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REVENUE RECOGNITION, Disaggregated Revenues (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Contract
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
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 $ 428 452 $ 775 761
Revenues 27,416 25,251 51,960 47,746
Tariff Revenue [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 25,185 23,026 47,555 43,421
Tariff Revenue [Member] | Consumption Charges [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 15,176 12,936 27,486 23,383
Tariff Revenue [Member] | Fixed Fees [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 9,102 8,028 18,422 16,066
Tariff Revenue [Member] | Service Charges [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 178 174 380 354
Tariff Revenue [Member] | DSIC [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 0 1,340 0 2,519
Tariff Revenue [Member] | Metered Wastewater Services [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 205 146 344 251
Tariff Revenue [Member] | Industrial Wastewater Services [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 524 402 923 848
Non-Tariff Revenue [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 1,803 1,773 3,630 3,564
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 1,424 1,372 2,854 2,735
Non-Tariff Revenue [Member] | Contract Operations [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 238 276 505 521
Non-Tariff Revenue [Member] | Design and Installation [Member]        
Disaggregation of Revenue [Abstract]        
Revenues 5 16 59 121
Non-Tariff Revenue [Member] | Inspection Fees [Member]        
Disaggregation of Revenue [Abstract]        
Revenues $ 136 $ 109 $ 212 $ 187