Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 7,076,565		$ 3,258,269		$ 3,153,662
Charged to costs and expenses		3,402,468	[1]	5,164,943	[1]	1,614,943
Charged to other accounts		32,400		26,400		20,160
Net accounts written off	[2]	(2,207,732)		(1,373,047)		(1,530,496)
Balance at end of period		8,303,701		7,076,565		$ 3,258,269
Deferred Bad Debt Expense [Member]
Regulatory Assets [Line Items]
Regulatory assets		$ 1,800,000		$ 3,800,000

[1] During the year ended December 31, 2021 and 2020, MGE deferred $1.8 million and $3.8 million, respectively, of bad debt expense as a regulatory asset. See Footnote 8 of the Notes to Consolidated Financial Statements in this Report for further information.

[2] Net of recovery of amounts previously written off