CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Operating Revenues	$ 32,541	$ 31,769
Operating Expenses:
Operations and Maintenance	18,356	17,192
Depreciation	4,832	4,448
Other Taxes	3,719	3,602
Total Operating Expenses	26,907	25,242
Operating Income	5,634	6,527
Other Income (Expense):
Allowance for Funds Used During Construction	1,263	1,123
Other Income (Expense), net	775	385
Total Other Income, net	2,038	1,508
Interest Charges	1,738	1,669
Income before Income Taxes	5,934	6,366
Income Taxes	(973)	(1,302)
Net Income	6,907	7,668
Preferred Stock Dividend Requirements	30	30
Earnings Applicable to Common Stock	$ 6,877	$ 7,638
Earnings per share of Common Stock:
Basic	$ 0.39	$ 0.44
Diluted	$ 0.39	$ 0.44
Average Number of Common Shares Outstanding:
Basic	17,476	17,437
Diluted	17,591	17,552