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Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 3,705 $ 4,002
Adjustments to reconcile net income to net cash provided by operating activities:    
Gain on life insurance 0 (515)
Depreciation and amortization 2,174 2,024
Stock-based compensation 28 37
Decrease in deferred income taxes (108) (14)
Other 29 100
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable and unbilled revenues 1,038 (457)
Decrease in recoverable income taxes 139 533
Increase in materials and supplies, prepaid expenses, prepaid pension cost, regulatory and other assets (2,201) (1,746)
Increase in accounts payable, accrued compensation and benefits, accrued expenses, deferred employee benefits, regulatory liabilities, and other deferred credits 1,684 570
Increase in accrued interest 109 208
Net cash provided by operating activities 6,597 4,742
CASH FLOWS FROM INVESTING ACTIVITIES:    
Utility plant additions, including debt portion of allowance for funds used during construction of $146 in 2021 and $57 in 2020 (7,431) (3,858)
Net cash used in investing activities (7,431) (3,858)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Customers' advances for construction and contributions in aid of construction 792 1,419
Repayments of customer advances (137) (58)
Proceeds of long-term debt issues 11,648 6,784
Repayments of long-term debt (13,178) (6,478)
Changes in cash overdraft position (1,263) (621)
Issuance of common stock 473 411
Dividends paid (2,448) (2,341)
Net cash used in financing activities (4,113) (884)
Net change in cash, cash equivalents, and restricted cash (4,947) 0
Cash, cash equivalents, and restricted cash at beginning of period 5,002 2
Cash and cash equivalents at end of period 55 2
Cash paid during the period for:    
Interest, net of amounts capitalized 912 884
Income taxes $ 0 $ 0
Supplemental schedule of non-cash investing and financing activities:    
Accounts payable includes $3,831 in 2021 and $2,010 in 2020 for the construction of utility plant