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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 16,598 $ 14,402
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on life insurance (515) 0
Depreciation and amortization 8,177 7,688
Stock-based compensation 154 166
Increase in deferred income taxes 88 641
Other 552 251
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable and unbilled revenues (1,948) 282
Increase in recoverable income taxes (174) (547)
Increase in materials and supplies, prepaid expenses, prepaid pension cost, regulatory and other assets (8,205) (5,903)
Increase in accounts payable, accrued compensation and benefits, accrued expenses, deferred employee benefits, regulatory liabilities, and other deferred credits 5,463 2,129
Increase (decrease) in accrued interest and taxes 45 (228)
Net cash provided by operating activities 20,235 18,881
CASH FLOWS FROM INVESTING ACTIVITIES:    
Utility plant additions, including debt portion of allowance for funds used during construction of $296 in 2020 and $205 in 2019 (32,123) (18,425)
Acquisitions of wastewater systems (1,176) (2,112)
Cash received from surrender of life insurance policies 672 0
Net cash used in investing activities (32,627) (20,537)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Customers' advances for construction and contributions in aid of construction 3,155 1,695
Repayments of customer advances (419) (396)
Proceeds of long-term debt issues 62,156 94,043
Debt issuance costs (162) (613)
Repayments of long-term debt (39,628) (85,906)
Repayments under short-term line of credit agreements 0 (1,000)
Changes in cash overdraft position (121) 314
Issuance of common stock 1,805 2,505
Dividends paid (9,394) (8,986)
Net cash provided by financing activities 17,392 1,656
Net change in cash, cash equivalents, and restricted cash 5,000 0
Cash, cash equivalents, and restricted cash at beginning of period 2 2
Cash, cash equivalents, and restricted cash at end of period 5,002 2
Cash paid during the period for:    
Interest, net of amounts capitalized 4,180 4,821
Income taxes $ 2,429 $ 2,230
Supplemental schedule of non-cash investing and financing activities:    
Accounts payable includes $3,022 in 2020 and $1,029 in 2019 for the construction of utility plant
Contributions in aid of construction includes $1,024 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 $ 2 $ 2
Restricted cash 5,000 0
Cash, cash equivalents, and restricted cash at end of period $ 5,002 $ 2