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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 9,846 $ 6,746 $ 7,620
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 7,930 7,410 7,032
Deferred income taxes, net 4,191 4,466 3,480
Stock compensation 108 120 111
AFUDC, equity portion (205) (100) (111)
Changes in assets and liabilities:      
Accounts receivable, net of allowance for doubtful accounts (757) 215 290
Unbilled operating revenues 639 (22) (96)
Materials and supplies 130 (237) (26)
Prepaid property taxes (35) (33) (38)
Prepaid expenses and other 73 1,110 (1,336)
Other deferred assets (266) (254) (111)
Regulatory assets 341 (124) (92)
Accounts payable 715 (617) (295)
Accrued expenses 1,177 127 1,441
Accrued interest (85) 34 (172)
Customer deposits and other, net (348) 451 693
Postretirement benefit obligation (81) (70) (212)
NET CASH PROVIDED BY OPERATING ACTIVITIES 23,373 19,222 18,178
CASH FLOWS USED IN INVESTING ACTIVITIES      
Capital expenditures (net of AFUDC, equity portion) (20,546) (15,787) (19,703)
Proceeds from sale of assets 29 55 61
NET CASH USED IN INVESTING ACTIVITIES (20,517) (15,732) (19,642)
CASH FLOWS FROM FINANCING ACTIVITIES      
Net (repayments) borrowings under lines of credit agreements (1,023) (17,331) 3,948
(Increase) decrease in overdraft payable 385 (375) (286)
Net advances and contributions in aid of construction 3,629 1,640 2,179
Change in deferred debt issuance costs 119 72 36
Net proceeds from issuance of common stock 2,079 17,176 1,918
Dividends paid (6,850) (6,191) (5,677)
Issuance of long-term debt 729 3,195 0
Principal repayments of long-term debt (1,618) (1,544) (949)
NET CASH (USED IN)PROVIDED BY FINANCING ACTIVITIES (2,550) (3,358) 1,169
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 306 132 (295)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 311 179 474
CASH AND CASH EQUIVALENTS AT END OF YEAR 617 311 179
Supplemental Disclosures of Cash Flow Information:      
Utility plant received as construction advances and contributions 1,904 706 376
Contractual amounts of contributions in aid of construction due from developers included in accounts receivable 629 627 509
Contractual amounts of contributions in aid of construction received from developers included in accounts receivable 602 509 630
Supplemental Disclosures of Cash Flow Information:      
Interest paid 7,130 7,255 7,467
Income taxes paid $ 1,391 $ 312 $ 1,942