CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Water Production	$ 299,187	$ 249,153
Transmission and Distribution	784,194	735,138
General	99,933	97,581
Construction Work in Progress	32,308	53,570
TOTAL	1,215,622	1,135,442
Less Accumulated Depreciation	230,124	214,891
UTILITY PLANT - NET	985,498	920,551
Cash and Cash Equivalents	2,970	3,828
Accounts Receivable, net of allowance for uncollectible accounts of $2,055 and $2,326, respectively	18,990	16,018
Litigation Settlement Receivable	93,163
Unbilled Revenues	11,316	8,659
Materials and Supplies (at average cost)	6,405	6,177
Prepayments	2,918	2,624
TOTAL CURRENT ASSETS	135,762	37,306
Operating Lease Right of Use Asset	3,338	3,826
Preliminary Survey and Investigation Charges	2,372	2,806
Regulatory Assets	94,485	90,046
Non-utility Assets - Net	11,383	11,207
Employee Benefit Plans	10,527	8,689
Other	51	19
TOTAL OTHER ASSETS	122,156	116,593
TOTAL ASSETS	1,243,416	1,074,450
CAPITALIZATION AND LIABILITIES
Common Stock, No Par Value	243,250	233,054
Retained Earnings	176,333	167,274
TOTAL COMMON EQUITY	419,583	400,328
Preferred Stock	2,084	2,084
Long-term Debt	354,276	290,280
TOTAL CAPITALIZATION	775,943	692,692
Current Portion of Long-term Debt	7,444	17,462
Notes Payable	42,250	55,500
Accounts Payable	28,604	24,847
Litigation Settlement Payable	27,949
Accrued Taxes	8,143	12,162
Accrued Interest	2,546	2,535
Unearned Revenues and Advanced Service Fees	1,459	1,365
Other	2,908	3,988
TOTAL CURRENT LIABILITIES	121,303	117,859
COMMITMENTS AND CONTINGENT LIABILITIES (Note 7)
Customer Advances for Construction	21,464	21,382
Lease Obligations	3,221	3,706
Accumulated Deferred Income Taxes	87,763	77,783
Regulatory Liabilities	112,815	46,734
Other	681	919
TOTAL OTHER LIABILITIES	225,944	150,524
CONTRIBUTIONS IN AID OF CONSTRUCTION	120,226	113,375
TOTAL CAPITALIZATION AND LIABILITIES	$ 1,243,416	$ 1,074,450