Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 2,139	$ 1,941
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,364	1,279
Increase in deferred income taxes	657	515
Other	52	58
Changes in assets and liabilities:
Decrease in accounts receivable and unbilled revenues	633	349
Decrease in recoverable income taxes	0	197
Increase in materials and supplies, prepaid expenses, regulatory and other assets	(393)	(304)
Decrease in accounts payable, accrued compensation and benefits, accrued expenses, deferred employee benefits, and other deferred credits	(1,061)	(875)
Increase in accrued interest and taxes	669	162
Net cash provided by operating activities	4,060	3,322
CASH FLOWS FROM INVESTING ACTIVITIES:
Utility plant additions, including debt portion of allowance for funds used during construction of $17 in 2013 and $7 in 2012	(2,442)	(2,076)
Acquisitions of water and wastewater systems	(27)	0
Decrease in notes receivable	8	10
Net cash used in investing activities	(2,461)	(2,066)
CASH FLOWS FROM FINANCING ACTIVITIES:
Customers' advances for construction and contributions in aid of construction	220	62
Repayments of customer advances	(58)	(82)
Repayments of long-term debt	(11)	(11)
Repurchase of common stock	(197)	0
Issuance of common stock	776	568
Dividends paid	(1,787)	(1,709)
Net cash used in financing activities	(1,057)	(1,172)
Net change in cash and cash equivalents	542	84
Cash and cash equivalents at beginning of period	4,012	4,006
Cash and cash equivalents at end of period	4,554	4,090
Cash paid during the period for:
Interest, net of amounts capitalized	808	1,146
Income taxes	$ 7	$ 0