CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 16,817	$ 14,925	$ 14,278
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,143	10,803	10,288
Deferred income taxes, net	(1,963)	(2,813)	899
Stock compensation	178	181	192
AFUDC, equity portion	(781)	(886)	(427)
Changes in assets and liabilities:
Accounts receivable, net of allowance for doubtful accounts	(2,324)	(94)	(87)
Income tax receivable	(610)	753	1,581
Unbilled operating revenues	45	230	(14)
Materials and supplies	(271)	195	60
Income tax payable	(106)	343	0
Prepaid property taxes	63	(84)	(75)
Prepaid expenses and other	42	(126)	(82)
Other deferred assets	(409)	(361)	(245)
Regulatory assets	390	388	417
Regulatory liabilities	(635)	(642)	(388)
Accounts payable	(1,835)	(11)	(666)
Accrued expenses	301	(789)	1,014
Accrued interest	100	46	(1,021)
Revenue reserved for refund	0	(3,298)	3,298
Customer deposits and other	213	110	119
NET CASH PROVIDED BY OPERATING ACTIVITIES	20,358	18,870	29,141
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (net of AFUDC, equity portion)	(34,277)	(40,677)	(49,053)
Investment in acquisitions	(5,741)	0	0
Proceeds from sale of assets	46	51	49
NET CASH USED IN INVESTING ACTIVITIES	(39,972)	(40,626)	(49,004)
CASH FLOWS FROM FINANCING ACTIVITIES
Net borrowings (repayments) under lines of credit agreements	19,313	(8,442)	6,332
Increase (decrease) in overdraft payable	90	(102)	(187)
Net advances and contributions in aid of construction	9,280	10,507	10,461
Net proceeds from issuance of common stock	1,539	1,033	956
Issuance of long-term debt	0	30,000	12,000
Dividends paid	(9,376)	(9,122)	(8,819)
Debt issuance costs	(28)	(90)	(195)
Principal repayments of long-term debt	(1,772)	(1,725)	(1,344)
NET CASH PROVIDED BY FINANCING ACTIVITIES	19,046	22,059	19,204
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(568)	303	(659)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	596	293	952
CASH AND CASH EQUIVALENTS AT END OF PERIOD	28	596	293
Non-cash Investing and Financing Activity:
Utility plant received as construction advances and contributions	2,403	3,716	1,153
Contractual amounts of contributions in aid of construction due from developers included in accounts receivable	1,705	710	2,156
Contractual amounts of contributions in aid of construction received from developers previously included in accounts receivable	781	2,050	2,981
Supplemental Disclosures of Cash Flow Information:
Interest paid	7,519	6,978	7,273
Income taxes paid	8,792	7,332	3,287
Purchase price allocation of investment in acquisitions:
Utility plant	5,118	0	0
Other deferred assets/goodwill	623	0	0
Total investment in acquisitions	$ 5,741	$ 0	$ 0