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Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 12,983 $ 12,888
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on life insurance 0 (515)
Depreciation and amortization 6,595 6,113
Stock-based compensation 167 126
Increase in deferred income taxes 53 93
Other 46 342
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable and unbilled revenues 745 (1,657)
Decrease in recoverable income taxes 700 497
Increase in materials and supplies, prepaid expenses, prepaid pension cost, regulatory and other assets (6,911) (6,184)
Increase in accounts payable, accrued compensation and benefits, accrued expenses, deferred employee benefits, regulatory liabilities, and other deferred credits 3,989 4,449
Increase in accrued interest 109 154
Net cash provided by operating activities 18,476 16,306
CASH FLOWS FROM INVESTING ACTIVITIES:    
Utility plant additions, including debt portion of allowance for funds used during construction of $493 in 2021 and $184 in 2020 (27,434) (15,973)
Acquisitions of wastewater systems 0 (1,158)
Cash received from surrender of life insurance policies 0 672
Net cash used in investing activities (27,434) (16,459)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Customers' advances for construction and contributions in aid of construction 1,955 2,760
Repayments of customer advances (772) (225)
Proceeds of long-term debt issues 37,452 53,671
Debt issuance costs 0 (162)
Repayments of long-term debt (28,960) (37,843)
Changes in cash overdraft position 14 (1,384)
Issuance of common stock 1,612 1,273
Dividends paid (7,344) (7,038)
Net cash provided by financing activities 3,957 11,052
Net change in cash, cash equivalents, and restricted cash (5,001) 10,899
Cash, cash equivalents, and restricted cash at beginning of period 5,002 2
Cash and cash equivalents at end of period 1 10,901
Cash paid during the period for:    
Interest, net of amounts capitalized 2,936 3,029
Income taxes $ 217 $ 1,753
Supplemental schedule of non-cash investing and financing activities:    
Accounts payable includes $3,562 in 2021 and $3,647 in 2020 for the construction of utility plant
Contributions in aid of construction includes $1,024 in 2020 recorded as part of the Felton Borough acquisition