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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 16,984 $ 16,598
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on life insurance 0 (515)
Depreciation and amortization 8,859 8,177
Stock-based compensation 213 154
Increase in deferred income taxes 164 88
Other 15 552
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable and unbilled revenues 235 (1,948)
Increase in recoverable income taxes (173) (174)
Increase in materials and supplies, prepaid expenses, prepaid pension cost, regulatory and other assets (8,508) (8,205)
Increase in accounts payable, accrued compensation and benefits, accrued expenses, deferred employee benefits, regulatory liabilities, and other deferred credits 5,170 5,463
Increase in accrued interest 0 45
Net cash provided by operating activities 22,959 20,235
CASH FLOWS FROM INVESTING ACTIVITIES:    
Utility plant additions, including debt portion of allowance for funds used during construction of $682 in 2021 and $296 in 2020 (34,409) (32,123)
Acquisitions of wastewater systems (11,991) (1,176)
Cash received from surrender of life insurance policies 0 672
Net cash used in investing activities (46,400) (32,627)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Customers' advances for construction and contributions in aid of construction 3,989 3,155
Repayments of customer advances (926) (419)
Proceeds of long-term debt issues 60,269 62,156
Debt issuance costs 0 (162)
Repayments of long-term debt (37,649) (39,628)
Changes in cash overdraft position 483 (121)
Issuance of common stock 2,082 1,805
Dividends paid (9,808) (9,394)
Net cash provided by financing activities 18,440 17,392
Net change in cash, cash equivalents, and restricted cash (5,001) 5,000
Cash, cash equivalents, and restricted cash at beginning of period 5,002 2
Cash, cash equivalents, and restricted cash at end of period 1 5,002
Cash paid during the period for:    
Interest, net of amounts capitalized 4,056 4,180
Income taxes $ 714 $ 2,429
Supplemental schedule of non-cash investing and financing activities:    
Accounts payable includes $2,572 in 2021 and $3,022 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.
Reconciliation of cash, cash equivalents, and restricted cash reported in the Balance Sheets    
Cash and cash equivalents $ 1 $ 2
Restricted cash 0 5,000
Cash, cash equivalents, and restricted cash at end of period $ 1 $ 5,002