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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 19,580 $ 16,984
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 10,139 8,859
Stock-based compensation 279 213
Increase in deferred income taxes 4 164
Other (54) 15
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable and unbilled revenues (3,005) 235
(Increase) decrease in recoverable income taxes 12 (173)
Increase in materials and supplies, prepaid expenses, prepaid pension cost, regulatory and other assets (537) (8,508)
Increase (decrease) in accounts payable, accrued compensation and benefits, accrued expenses, deferred employee benefits, regulatory liabilities, and other deferred credits (4,406) 5,170
Increase in accrued interest 6 0
Net cash provided by operating activities 22,018 22,959
CASH FLOWS FROM INVESTING ACTIVITIES:    
Utility plant additions, including debt portion of allowance for funds used during construction of $839 in 2022 and $682 in 2021 (50,532) (34,409)
Acquisitions of water and wastewater systems (3,388) (11,991)
Net cash used in investing activities (53,920) (46,400)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Customers' advances for construction and contributions in aid of construction 3,488 3,989
Repayments of customer advances (972) (926)
Proceeds of long-term debt issues 54,378 60,269
Repayments of long-term debt (61,458) (37,649)
Changes in cash overdraft position 1,429 483
Issuance of common stock 45,711 2,082
Dividends paid (10,674) (9,808)
Net cash provided by financing activities 31,902 18,440
Net change in cash, cash equivalents, and restricted cash 0 (5,001)
Cash, cash equivalents, and restricted cash at beginning of year 1 5,002
Cash, cash equivalents, and restricted cash at end of year 1 1
Cash paid during the year for:    
Interest, net of amounts capitalized 4,041 4,056
Income taxes $ 0 $ 714
Supplemental disclosure of non-cash investing and financing activities:    
Accounts payable includes $5,118 in 2022 and $2,572 in 2021 for the construction of utility plant.