CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 12,954	$ 11,305	$ 9,506
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,188	8,837	8,673
Deferred income taxes, net	5,464	5,097	7,255
Stock compensation	92	183	135
AFUDC, equity portion	(146)	(163)	(212)
Changes in assets and liabilities:
Accounts receivable, net of allowance for doubtful accounts	(292)	(867)	147
Income taxes receivable	1,278	1,640	(2,613)
Unbilled operating revenues	132	1,779	(305)
Materials and supplies	149	177	(405)
Prepaid property taxes	(78)	(190)	90
Prepaid expenses and other	(209)	49	(390)
Other deferred assets	(175)	(167)	(172)
Regulatory assets	734	187	(187)
Accounts payable	618	1,131	(357)
Accrued expenses	55	(259)	(2,197)
Accrued interest	(32)	(396)	374
Customer deposits and other, net	128	102	(832)
Postretirement benefit obligation	(81)	(38)	(41)
NET CASH PROVIDED BY OPERATING ACTIVITIES	29,779	28,407	18,469
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (net of AFUDC, equity portion)	(28,251)	(20,694)	(23,730)
Proceeds from sale of assets	96	48	35
NET CASH USED IN INVESTING ACTIVITIES	(28,155)	(20,646)	(23,695)
CASH FLOWS FROM FINANCING ACTIVITIES
Net (repayments) borrowings under lines of credit agreements	(3,357)	(8,004)	8,159
Increase in overdraft payable	(514)	405	(605)
Net advances and contributions in aid of construction	9,907	5,829	3,808
Net proceeds from issuance of common stock	1,826	3,049	1,651
Dividends paid	(8,180)	(7,811)	(7,523)
Issuance of long-term debt	0	0	689
Principal repayments of long-term debt	(1,289)	(1,263)	(1,132)
NET CASH USED IN FINANCING ACTIVITIES	(1,607)	(7,795)	5,047
NET (DECREASE) IN CASH AND CASH EQUIVALENTS	17	(34)	(179)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	209	243	422
CASH AND CASH EQUIVALENTS AT END OF YEAR	226	209	243
Supplemental Disclosures of Cash Flow Information:
Utility plant received as construction advances and contributions	2,499	1,451	1,491
Contractual amounts of contributions in aid of construction due from developers included in accounts receivable	1,542	796	456
Contractual amounts of contributions in aid of construction received from developers previously included in accounts receivable	388	377	361
Supplemental Disclosures of Cash Flow Information:
Interest paid	6,676	7,394	7,019
Income taxes paid	$ 1,434	$ 2,608	$ 1,615