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Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 3,653 $ 3,859
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,814 2,480
Stock-based compensation 54 45
Increase (decrease) in deferred income taxes 543 (230)
Other (182) 15
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable and unbilled revenues 994 (161)
(Increase) decrease in recoverable income taxes 2 (1)
Increase in materials and supplies, prepaid expenses, prepaid pension cost, regulatory and other assets (3,185) (3,242)
Increase in accounts payable, accrued compensation and benefits, accrued expenses, deferred employee benefits, regulatory liabilities, and other deferred credits 1,359 2,456
Increase in accrued interest 172 112
Net cash provided by operating activities 6,224 5,333
CASH FLOWS FROM INVESTING ACTIVITIES:    
Utility plant additions, including debt portion of allowance for funds used during construction of $418 in 2023 and $165 in 2022 (10,581) (7,504)
Net cash used in investing activities (10,581) (7,504)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Customers' advances for construction and contributions in aid of construction 134 676
Repayments of customer advances (39) (337)
Proceeds of long-term debt issues 49,484 13,375
Debt issuance costs (171) 0
Repayments of long-term debt (39,224) (8,289)
Changes in cash overdraft position (3,175) (1,153)
Issuance of common stock 405 450
Dividends paid (2,892) (2,551)
Net cash provided by financing activities 4,522 2,171
Net change in cash and cash equivalents 165 0
Cash and cash equivalents at beginning of period 1 1
Cash and cash equivalents at end of period 166 1
Cash paid during the period for:    
Interest, net of amounts capitalized $ 969 $ 964
Supplemental disclosure of non-cash investing and financing activities:    
Accounts payable includes $7,764 in 2023 and $3,715 in 2022 for the construction of utility plant.