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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Operating Revenues $ 37,794 $ 34,654 $ 101,098 $ 95,100
Operating Expenses:        
Operations and Maintenance 16,599 16,772 48,215 49,089
Depreciation 3,243 3,032 9,561 8,962
Other Taxes 3,796 3,390 10,537 9,671
Total Operating Expenses 23,638 23,194 68,313 67,722
Operating Income 14,156 11,460 32,785 27,378
Other Income (Expense):        
Allowance for Funds Used During Construction 207 113 387 297
Other Income (Expense), net 400 108 449 108
Total Other Income, net 607 221 836 405
Interest Charges 1,427 1,505 3,841 4,058
Income before Income Taxes 13,336 10,176 29,780 23,725
Income Taxes 4,523 3,433 10,258 8,258
Net Income 8,813 6,743 19,522 15,467
Preferred Stock Dividend Requirements 36 36 108 108
Earnings Applicable to Common Stock $ 8,777 $ 6,707 $ 19,414 $ 15,359
Earnings per share of Common Stock:        
Basic $ 0.54 $ 0.41 $ 1.19 $ 0.95
Diluted $ 0.54 $ 0.41 $ 1.19 $ 0.95
Average Number of Common Shares Outstanding:        
Basic 16,284 16,202 16,262 16,161
Diluted 16,440 16,358 16,418 16,317
Cash Dividends Paid per Common Share $ 0.1988 $ 0.1925 $ 0.5963 $ 0.5775