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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net Income $ 25,459 $ 17,463
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:    
Depreciation and Amortization 11,743 10,677
Provision for Deferred Income Taxes (5,975) 8,394
Equity Portion of Allowance for Funds Used During Construction (AFUDC) (538) (323)
Cash Surrender Value of Life Insurance (119) (161)
Stock Compensation Expense 757 673
Changes in Assets and Liabilities:    
Accounts Receivable (2,759) (1,601)
Unbilled Revenues (2,098) (2,038)
Materials and Supplies (1,515) (347)
Prepayments (1,111) (564)
Accounts Payable 5,606 (230)
Accrued Taxes 3,400 (504)
Accrued Interest (545) (693)
Employee Benefit Plans (1,426) (1,362)
Unearned Revenue & Advanced Service Fees 85 39
Other Assets and Liabilities 1,899 (774)
NET CASH PROVIDED BY OPERATING ACTIVITIES 32,863 28,649
CASH FLOWS FROM INVESTING ACTIVITIES:    
Utility Plant Expenditures, Including AFUDC of $267 in 2018, $150 in 2017 (49,518) (35,170)
NET CASH USED IN INVESTING ACTIVITIES (49,518) (35,170)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Redemption of Long-term Debt (6,013) (5,163)
Proceeds from Issuance of Long-term Debt 9,265 6,968
Net Short-term Bank Borrowings 20,500 12,500
Deferred Debt Issuance Expense (862) (144)
Proceeds from Issuance of Common Stock 864 908
Payment of Common Dividends (10,993) (10,344)
Payment of Preferred Dividends (108) (108)
Construction Advances and Contributions-Net 3,140 726
NET CASH PROVIDED BY FINANCING ACTIVITIES 15,793 5,343
NET CHANGES IN CASH AND CASH EQUIVALENTS (862) (1,178)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 4,937 4,318
CASH AND CASH EQUIVALENTS AT END OF PERIOD 3,579 3,140
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITY:    
Utility Plant received as Construction Advances and Contributions 3,028 3,238
Cash Paid During the Year for:    
Interest 5,090 4,775
Interest Capitalized 267 150
Income Taxes $ 3,191 $ 1,462