CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
UTILITY PLANT: Water Production	$ 307,173	$ 303,791
Transmission and Distribution	825,223	809,862
General	102,149	100,593
Construction Work in Progress	29,703	19,636
TOTAL	1,264,248	1,233,882
Less Accumulated Depreciation	244,102	235,540
UTILITY PLANT - NET	1,020,146	998,342
CURRENT ASSETS: Cash and Cash Equivalents	8,025	2,390
Accounts Receivable, net of allowance for credit losses of $2,135 and $2,137, respectively in 2024 and 2023	20,173	18,172
Litigation Settlement Receivable	69,872	69,872
Unbilled Revenues	12,530	9,297
Materials and Supplies (at average cost)	6,477	6,972
Prepayments	3,925	1,833
TOTAL CURRENT ASSETS	121,002	108,536
OTHER ASSETS: Operating Lease Right of Use Asset	2,872	3,185
Preliminary Survey and Investigation Charges	1,968	1,932
Regulatory Assets	91,066	90,694
Non-utility Assets - Net	11,771	11,522
Employee Benefit Plans	25,763	21,779
Other	51	62
TOTAL OTHER ASSETS	133,491	129,174
TOTAL ASSETS	1,274,639	1,236,052
CAPITALIZATION AND LIABILITIES
CAPITALIZATION: Common Stock, No Par Value	247,014	246,764
Retained Earnings	185,864	176,227
TOTAL COMMON EQUITY	432,878	422,991
Preferred Stock	2,084	2,084
Long-term Debt	355,975	358,153
TOTAL CAPITALIZATION	790,937	783,228
CURRENT Current Portion of Long-term Debt	7,968	7,740
LIABILITIES: Notes Payable	72,250	42,750
Accounts Payable	25,222	27,618
Litigation Settlement Payable	6,237	6,237
Accrued Taxes	14,241	10,535
Accrued Interest	3,252	3,138
Unearned Revenues and Advanced Service Fees	1,689	1,390
Other	4,124	4,421
TOTAL CURRENT LIABILITIES	134,983	103,829
COMMITMENTS AND CONTINGENT LIABILITIES (Note 7)
OTHER LIABILITIES: Customer Advances for Construction	21,145	21,313
Lease Obligations	2,747	3,063
Accumulated Deferred Income Taxes	91,800	88,736
Regulatory Liabilities	55,203	113,021
Other	420	592
TOTAL OTHER LIABILITIES	171,315	226,725
CONTRIBUTIONS IN AID OF CONSTRUCTION	177,404	122,270
TOTAL CAPITALIZATION AND LIABILITIES	$ 1,274,639	$ 1,236,052