CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Operating Revenues	$ 39,874	$ 39,920	$ 109,117	$ 106,965
Operating Expenses:
Operations and Maintenance	18,950	17,949	55,265	52,761
Depreciation	5,504	4,721	15,523	13,798
Other Taxes	3,996	4,073	11,456	11,318
Total Operating Expenses	28,450	26,743	82,244	77,877
Operating Income	11,424	13,177	26,873	29,088
Other Income (Expense):
Allowance for Funds Used During Construction (AFUDC)	344	953	2,376	2,871
Other Income (Expense), net	744	444	2,308	1,164
Total Other Income, net	1,088	1,397	4,684	4,035
Interest Charges	2,101	1,906	5,910	5,521
Income before Income Taxes	10,411	12,668	25,647	27,602
Income Taxes	(1,065)	(69)	(3,658)	(2,516)
Net Income	11,476	12,737	29,305	30,118
Preferred Stock Dividend Requirements	30	30	90	90
Earnings Applicable to Common Stock	$ 11,446	$ 12,707	$ 29,215	$ 30,028
Earnings per share of Common Stock:
Basic	$ 0.65	$ 0.73	$ 1.67	$ 1.72
Diluted	$ 0.65	$ 0.72	$ 1.66	$ 1.71
Average Number of Common Shares Outstanding :
Basic	17,491	17,466	17,485	17,455
Diluted	17,606	17,581	17,600	17,570