Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Revenues
Regulated Energy	$ 73,518	$ 73,403	$ 176,473	$ 177,021
Unregulated Energy and other	23,533	21,139	73,268	77,984
Total Operating Revenues	97,051	94,542	249,741	255,005
Operating Expenses
Regulated Energy cost of sales	16,387	18,317	51,219	54,833
Unregulated Energy and other cost of sales	6,573	6,857	24,609	31,267
Operations	34,607	31,531	70,559	66,945
Operating Costs and Expenses	4,143	3,600	7,979	7,280
Settlement Gain	(130)	(130)	(130)	(130)
Depreciation and amortization			24,500	22,684
Depreciation and Amortization Costs	12,247	11,464	24,500	22,392
Other taxes	5,247	4,738	10,894	10,131
Total Operating Expenses	79,074	76,377	189,630	192,718
Operating Income	17,977	18,165	60,111	62,287
Other income (expense), net	(279)	(320)	3,039	(380)
Interest charges	5,054	5,552	10,868	11,180
Income from Continuing Operations Before Income Taxes	12,644	12,293	52,282	50,727
Income Taxes on Continuing Operations	1,983	3,379	12,580	13,002
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax	295	(610)	184	(757)
Net Income (Loss) Attributable to Parent	$ 10,956	$ 8,304	$ 39,886	$ 36,968
Weighted Average Common Shares Outstanding:
Basic (shares)	16,448,490	16,401,028	16,431,724	16,393,022
Diluted (shares)	16,503,603	16,445,743	16,487,807	16,439,333
Basic Earnings Per Share of Common Stock:
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.65	$ 0.55	$ 2.42	$ 2.31
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0.02	(0.04)	0.01	(0.05)
Basic (in dollars per share)	0.67	0.51	2.43	2.26
Earnings Per Share, Diluted [Abstract]
Income (Loss) from Continuing Operations, Per Diluted Share	0.64	0.54	2.41	2.30
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0.02	(0.04)	0.01	(0.05)
Diluted (in dollars per share)	$ 0.66	$ 0.50	$ 2.42	$ 2.25
Retained Earnings [Member]
Operating Expenses
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ 10,661	$ 8,914	$ 39,702	$ 37,725
Net Income (Loss) Attributable to Parent	$ 10,956	$ 8,304	$ 39,886	$ 36,968