Fair Value of Financial Instruments (Details-2) - USD ($) $ in Thousands	Dec. 31, 2022		Dec. 31, 2021
Assets:
Derivative asset, collateral offset			$ 1,300
Liabilities:
Derivative, right to reclaim collateral	$ 5,200
Recurring [Member]
Assets:
Derivative assets, net	3,069	[1]	3,606	[2]
Exchange-traded investments	1,516		1,296
Total Assets	4,585		4,902
Liabilities:
Derivative liabilities, net	8,163	[1]	2,989	[2]
Deferred compensation	4,743		3,653
Total Liabilities	12,906		6,642
Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	1,353	[1]	1,170	[2]
Exchange-traded investments	1,516		1,296
Total Assets	2,869		2,466
Liabilities:
Derivative liabilities, net	5,581	[1]	731	[2]
Deferred compensation	0		0
Total Liabilities	5,581		731
Recurring [Member] | Level 2 [Member]
Assets:
Derivative assets, net	0	[1]	0	[2]
Exchange-traded investments	0		0
Total Assets	0		0
Liabilities:
Derivative liabilities, net	0	[1]	0	[2]
Deferred compensation	4,743		3,653
Total Liabilities	4,743		3,653
Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	1,716	[1]	2,436	[2]
Exchange-traded investments	0		0
Total Assets	1,716		2,436
Liabilities:
Derivative liabilities, net	2,582	[1]	2,258	[2]
Deferred compensation	0		0
Total Liabilities	2,582		2,258
MGE [Member] | Recurring [Member]
Assets:
Derivative assets, net	3,069	[1]	3,606	[2]
Exchange-traded investments	115		230
Total Assets	3,184		3,836
Liabilities:
Derivative liabilities, net	8,163	[1]	2,989	[2]
Deferred compensation	4,743		3,653
Total Liabilities	12,906		6,642
MGE [Member] | Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	1,353	[1]	1,170	[2]
Exchange-traded investments	115		230
Total Assets	1,468		1,400
Liabilities:
Derivative liabilities, net	5,581	[1]	731	[2]
Deferred compensation	0		0
Total Liabilities	5,581		731
MGE [Member] | Recurring [Member] | Level 2 [Member]
Assets:
Derivative assets, net	0	[1]	0	[2]
Exchange-traded investments			0
Total Assets	0		0
Liabilities:
Derivative liabilities, net	0	[1]	0	[2]
Deferred compensation	4,743		3,653
Total Liabilities	4,743		3,653
MGE [Member] | Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	1,716	[1]	2,436	[2]
Exchange-traded investments	0		0
Total Assets	1,716		2,436
Liabilities:
Derivative liabilities, net	2,582	[1]	2,258	[2]
Deferred compensation	0		0
Total Liabilities	$ 2,582		$ 2,258

[1] As of December 31, 2022, collateral of $5.2 million was posted against and netted with derivative liability positions on the consolidated balance sheets. The fair value of the derivative liability disclosed in this table has not been reduced for the collateral posted.

[2] As of December 31, 2021, MGE received collateral of $1.3 million from counterparties under a master netting agreement for outstanding exchange traded derivative positions. The fair value of the derivative asset disclosed in this table has not been reduced for the collateral received.