Fair Value of Financial Instruments (Details-2) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Assets:
Derivative asset, collateral offset		$ 1,300	$ 0
Recurring [Member]
Assets:
Derivative assets, net	[1]	3,606	806
Exchange-traded investments		1,296	1,750
Total Assets		4,902	2,556
Liabilities:
Derivative liabilities, net	[1]	2,989	14,795
Deferred compensation		3,653	3,509
Total Liabilities		6,642	18,304
Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	[1]	1,170	436
Exchange-traded investments		1,296	1,750
Total Assets		2,466	2,186
Liabilities:
Derivative liabilities, net	[1]	731	370
Deferred compensation		0	0
Total Liabilities		731	370
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		3,653	3,509
Total Liabilities		3,653	3,509
Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	[1]	2,436	370
Exchange-traded investments		0	0
Total Assets		2,436	370
Liabilities:
Derivative liabilities, net	[1]	2,258	14,425
Deferred compensation		0	0
Total Liabilities		2,258	14,425
MGE [Member] | Recurring [Member]
Assets:
Derivative assets, net	[1]	3,606	806
Exchange-traded investments		230	603
Total Assets		3,836	1,409
Liabilities:
Derivative liabilities, net	[1]	2,989	14,795
Deferred compensation		3,653	3,509
Total Liabilities		6,642	18,304
MGE [Member] | Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	[1]	1,170	436
Exchange-traded investments		230	603
Total Assets		1,400	1,039
Liabilities:
Derivative liabilities, net	[1]	731	370
Deferred compensation		0	0
Total Liabilities		731	370
MGE [Member] | Recurring [Member] | Level 2 [Member]
Assets:
Derivative assets, net	[1]	0	0
Exchange-traded investments		0
Total Assets		0	0
Liabilities:
Derivative liabilities, net	[1]	0	0
Deferred compensation		3,653	3,509
Total Liabilities		3,653	3,509
MGE [Member] | Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	[1]	2,436	370
Exchange-traded investments		0	0
Total Assets		2,436	370
Liabilities:
Derivative liabilities, net	[1]	2,258	14,425
Deferred compensation		0	0
Total Liabilities		$ 2,258	$ 14,425

[1] 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. No collateral was posted against derivative positions owed to counterparties under a master netting agreement on the consolidated balance sheet as of December 31, 2020.