Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Revenues
Regulated Energy	$ 383,920	$ 352,746	$ 343,006
Unregulated Energy	206,869	152,526	154,151
Other	(20,821)	(17,074)	(17,552)
Total operating revenues	569,968	488,198	479,605
Operating Expenses
Natural gas and electricity costs	100,737	91,994	102,803
Propane and natural gas costs	86,213	45,944	51,698
Operations	148,294	142,055	137,845
Maintenance	16,793	15,587	15,679
Gain from a settlement	0	(130)	(130)
Depreciation and amortization	62,661	58,117	45,424
Other taxes	24,158	21,908	20,001
Total operating expenses	438,856	375,475	373,320
Operating Income	131,112	112,723	106,285
Other income (expense), net	1,721	3,222	(1,847)
Interest charges	20,135	21,765	22,224
Income from Continuing Operations Before Income Taxes	112,698	94,180	82,214
Income Taxes on Continuing Operations	29,231	23,538	21,114
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	83,467	70,642	61,100
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(1)	686	(1,349)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	0	170	5,402
Net Income (Loss) Attributable to Parent	$ 83,466	$ 71,498	$ 65,153
Weighted Average Common Shares Outstanding:
Basic (in shares)	17,558,078	16,711,579	16,398,443
Diluted (in shares)	17,633,029	16,770,735	16,448,486
Basic Earnings Per Share of Common Stock:
Income (Loss) from Continuing Operations, Per Basic Share	$ 4.75	$ 4.23	$ 3.73
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0	0.05	0.24
Basic (in usd per share)	4.75	4.28	3.97
Earnings Per Share, Diluted [Abstract]
Income (Loss) from Continuing Operations, Per Diluted Share	4.73	4.21	3.72
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0	0.05
Diluted (in usd per share)	$ 4.73	$ 4.26	$ 3.96