Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Revenues
Regulated Energy	$ 429,424	$ 383,920	$ 352,746
Unregulated Energy	280,750	206,869	152,526
Other	(29,470)	(20,821)	(17,074)
Total operating revenues	680,704	569,968	488,198
Operating Expenses
Natural gas and electricity costs	127,172	100,737	91,994
Propane and natural gas costs	133,334	86,213	45,944
Operations	164,505	148,294	142,055
Maintenance	18,176	16,793	15,587
Gain from a settlement	0	0	(130)
Depreciation and amortization	68,973	62,661	58,117
Other taxes	25,611	24,158	21,908
Total operating expenses	537,771	438,856	375,475
Operating Income	142,933	131,112	112,723
Other income, net	5,051	1,721	3,222
Interest charges	24,356	20,135	21,765
Income from Continuing Operations Before Income Taxes	123,628	112,698	94,180
Income Taxes on Continuing Operations	33,832	29,231	23,538
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	89,796	83,467	70,642
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	(1)	686
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	0	0	170
Net Income (Loss) Attributable to Parent	$ 89,796	$ 83,466	$ 71,498
Weighted Average Common Shares Outstanding:
Basic (in shares)	17,722,227	17,558,078	16,711,579
Diluted (in shares)	17,804,294	17,633,029	16,770,735
Earnings Per Share of Common Stock:
Income (Loss) from Continuing Operations, Per Basic Share	$ 5.07	$ 4.75	$ 4.23
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0	0.05
Basic (in usd per share)	5.07	4.75	4.28
Earnings Per Share, Diluted [Abstract]
Income (Loss) from Continuing Operations, Per Diluted Share	5.04	4.73	4.21
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0	0
Diluted (in usd per share)	$ 5.04	$ 4.73	$ 4.26