Fair Value of Financial Instruments (Details-2) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Assets:
Collateral posted against derivative positions		$ 6,900	$ 1,300
Recurring [Member]
Assets:
Derivative assets, net	[1]	10,144	3,606
Exchange-traded investments		1,443	1,296
Total Assets		11,587	4,902
Liabilities:
Derivative liabilities, net	[1]	503	2,989
Deferred compensation		3,613	3,653
Total liabilities		4,116	6,642
Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	[1]	3,183	1,170
Exchange-traded investments		1,443	1,296
Total Assets		4,626	2,466
Liabilities:
Derivative liabilities, net	[1]	321	731
Deferred compensation		0	0
Total liabilities		321	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		3,613	3,653
Total liabilities		3,613	3,653
Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	[1]	6,961	2,436
Exchange-traded investments		0	0
Total Assets		6,961	2,436
Liabilities:
Derivative liabilities, net	[1]	182	2,258
Deferred compensation		0	0
Total liabilities		182	2,258
MGE [Member] | Recurring [Member]
Assets:
Derivative assets, net	[1]	10,144	3,606
Exchange-traded investments		177	230
Total Assets		10,321	3,836
Liabilities:
Derivative liabilities, net	[1]	503	2,989
Deferred compensation		3,613	3,653
Total liabilities		4,116	6,642
MGE [Member] | Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	[1]	3,183	1,170
Exchange-traded investments		177	230
Total Assets		3,360	1,400
Liabilities:
Derivative liabilities, net	[1]	321	731
Deferred compensation		0	0
Total liabilities		321	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		3,613	3,653
Total liabilities		3,613	3,653
MGE [Member] | Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	[1]	6,961	2,436
Exchange-traded investments		0	0
Total Assets		6,961	2,436
Liabilities:
Derivative liabilities, net	[1]	182	2,258
Deferred compensation		0	0
Total liabilities		$ 182	$ 2,258

[1] As of March 31, 2022 and December 31, 2021 MGE received collateral of $6.9 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.