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	$ 11,846	$ 12,489	$ 11,484
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of land	(36)	0	(316)
Depreciation and amortization	6,422	6,151	5,932
Stock-based compensation	22	0	0
Increase in deferred income taxes	1,646	2,270	4,753
Other	331	317	319
Changes in assets and liabilities:
Increase in accounts receivable and unbilled revenues	(867)	(73)	(632)
(Increase) decrease in recoverable income taxes	767	(92)	(957)
Increase in materials and supplies, prepaid expenses, regulatory and other assets	(3,098)	(3,310)	(10,719)
Increase in accounts payable, accrued compensation and benefits, accrued expenses, deferred employee benefits, and other deferred credits	2,387	3,009	10,663
Decrease in accrued interest and taxes	(55)	(51)	(1,761)
Net cash provided by operating activities	19,365	20,710	18,766
CASH FLOWS FROM INVESTING ACTIVITIES:
Utility plant additions, including debt portion of allowance for funds used during construction of $127 in 2016, $115 in 2015 and $117 in 2014	(13,158)	(13,844)	(14,139)
Acquisitions of water and wastewater systems	(50)	(352)	(369)
Proceeds from sale of land	40	0	346
Decrease in notes receivable	0	11	40
Cash received from surrender of life insurance policies	642	0	0
Net cash used in investing activities	(12,526)	(14,185)	(14,122)
CASH FLOWS FROM FINANCING ACTIVITIES:
Customers' advances for construction and contributions in aid of construction	1,769	1,117	638
Repayments of customer advances	(443)	(447)	(419)
Proceeds of long-term debt issues	0	14,301	14,880
Debt issuance costs	0	(298)	(506)
Repayments of long-term debt	(53)	(11,886)	(14,923)
Repurchase of common stock	(1,339)	(2,546)	(5,692)
Issuance of common stock	2,513	2,307	2,703
Dividends paid	(7,956)	(7,682)	(7,402)
Net cash used in financing activities	(5,509)	(5,134)	(10,721)
Net change in cash and cash equivalents	1,330	1,391	(6,077)
Cash and cash equivalents at beginning of period	2,879	1,488	7,565
Cash and cash equivalents at end of period	4,209	2,879	1,488
Cash paid during the period for:
Interest, net of amounts capitalized	5,051	4,985	5,007
Income taxes	$ 2,509	$ 2,155	$ 2,808
Supplemental schedule of non-cash investing and financing activities:
Accounts payable includes $2,766 in 2016, $720 in 2015 and $833 in 2014 for the construction of utility plant.