Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 8,372,840	$ 8,303,701	$ 7,076,565
Charged to costs and expenses	[1]	3,264,309	3,814,311	3,402,468
Charged to other accounts		20,400	40,800	32,400
Net accounts written off	[2]	(3,559,473)	(3,785,972)	(2,207,732)
Balance at end of period		8,098,076	8,372,840	8,303,701
Deferred Bad Debt Expense [Member]
Regulatory Asset [Line Items]
Regulatory assets		$ 1,500,000	$ 2,100,000	$ 1,800,000

[1] For the years ended December 31, 2023, 2022, and 2021, MGE deferred $1.5 million, $2.1 million, and $1.8 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.