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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES      
Net income $ 13,983 $ 12,954 $ 11,305
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 9,555 9,188 8,837
Deferred income taxes, net 8,206 5,464 5,097
Stock compensation 423 92 183
AFUDC, equity portion (227) (146) (163)
Changes in assets and liabilities:      
Accounts receivable, net of allowance for doubtful accounts (187) (292) (867)
Income taxes receivable (2,203) 1,278 1,640
Unbilled operating revenues (24) 132 1,779
Materials and supplies 45 149 177
Prepaid property taxes (126) (78) (190)
Prepaid expenses and other (215) (209) 49
Other deferred assets (172) (175) (167)
Regulatory assets 405 734 187
Regulatory liabilities (37) (81) (38)
Accounts payable 3,321 618 1,131
Accrued expenses 1,579 55 (259)
Accrued interest 805 (32) (396)
Customer deposits and other, net 648 128 102
NET CASH PROVIDED BY OPERATING ACTIVITIES 35,779 29,779 28,407
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures (net of AFUDC, equity portion) (41,094) (28,251) (20,694)
Proceeds from sale of assets 87 96 48
NET CASH USED IN INVESTING ACTIVITIES (41,007) (28,155) (20,646)
CASH FLOWS FROM FINANCING ACTIVITIES      
Net (repayments) borrowings under lines of credit agreements 2,480 (3,357) (8,004)
Increase in overdraft payable 272 (514) 405
Net advances and contributions in aid of construction 11,353 9,907 5,829
Net proceeds from issuance of common stock 1,711 1,826 3,049
Dividends paid (8,496) (8,180) (7,811)
Debt issuance cost (148) 0 0
Principal repayments of long-term debt (1,218) (1,289) (1,263)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES 5,954 (1,607) (7,795)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 726 17 (34)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 226 209 243
CASH AND CASH EQUIVALENTS AT END OF YEAR 952 226 209
Supplemental Disclosures of Cash Flow Information:      
Utility plant received as construction advances and contributions in aid of construction 5,662 2,499 1,451
Contractual amounts of contributions in aid of construction due from developers included in accounts receivable 2,910 1,542 796
Contractual amounts of contributions in aid of construction received from developers previously included in accounts receivable 1,995 388 377
Supplemental Disclosures of Cash Flow Information:      
Interest paid 5,372 6,676 7,394
Income taxes paid $ 1,281 $ 1,434 $ 2,608