Fair Value of Financial Instruments (Details-2) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Assets:
Collateral posted against derivative positions		$ 6,500	$ 1,300
Recurring [Member]
Assets:
Derivative assets, net	[1]	12,178	3,606
Exchange-traded investments		1,493	1,296
Total Assets		13,671	4,902
Liabilities:
Derivative liabilities, net	[1]	3,694	2,989
Deferred compensation		3,783	3,653
Total liabilities		7,477	6,642
Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	[1]	3,009	1,170
Exchange-traded investments		1,493	1,296
Total Assets		4,502	2,466
Liabilities:
Derivative liabilities, net	[1]	3,484	731
Deferred compensation		0	0
Total liabilities		3,484	731
Recurring [Member] | Level 2 [Member]
Assets:
Derivative assets, net	[1]	0	0
Exchange-traded investments		0	0
Total Assets		0	0
Liabilities:
Derivative liabilities, net	[1]	0	0
Deferred compensation		3,783	3,653
Total liabilities		3,783	3,653
Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	[1]	9,169	2,436
Exchange-traded investments		0	0
Total Assets		9,169	2,436
Liabilities:
Derivative liabilities, net	[1]	210	2,258
Deferred compensation		0	0
Total liabilities		210	2,258
MGE [Member] | Recurring [Member]
Assets:
Derivative assets, net	[1]	12,178	3,606
Exchange-traded investments		126	230
Total Assets		12,304	3,836
Liabilities:
Derivative liabilities, net	[1]	3,694	2,989
Deferred compensation		3,783	3,653
Total liabilities		7,477	6,642
MGE [Member] | Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	[1]	3,009	1,170
Exchange-traded investments		126	230
Total Assets		3,135	1,400
Liabilities:
Derivative liabilities, net	[1]	3,484	731
Deferred compensation		0	0
Total liabilities		3,484	731
MGE [Member] | Recurring [Member] | Level 2 [Member]
Assets:
Derivative assets, net	[1]	0	0
Exchange-traded investments		0	0
Total Assets		0	0
Liabilities:
Derivative liabilities, net	[1]	0	0
Deferred compensation		3,783	3,653
Total liabilities		3,783	3,653
MGE [Member] | Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	[1]	9,169	2,436
Exchange-traded investments		0	0
Total Assets		9,169	2,436
Liabilities:
Derivative liabilities, net	[1]	210	2,258
Deferred compensation		0	0
Total liabilities		$ 210	$ 2,258

[1] As of June 30, 2022 and December 31, 2021 MGE received collateral of $6.5 million and $1.3 million, respectively, 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.