Fair Value of Financial Instruments (Details-2) - USD ($) $ in Thousands		Jun. 30, 2023	Dec. 31, 2022
Liabilities:
Derivative, right to reclaim collateral		$ 5,400	$ 5,200
Recurring [Member]
Assets:
Derivative assets, net	[1]	1,445	3,069
Exchange-traded investments		1,816	1,516
Total Assets		3,261	4,585
Liabilities:
Derivative liabilities, net	[1]	6,462	8,163
Deferred compensation		5,050	4,743
Total liabilities		11,512	12,906
Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	[1]	881	1,353
Exchange-traded investments		1,816	1,516
Total Assets		2,697	2,869
Liabilities:
Derivative liabilities, net	[1]	3,006	5,581
Deferred compensation		0	0
Total liabilities		3,006	5,581
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		5,050	4,743
Total liabilities		5,050	4,743
Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	[1]	564	1,716
Exchange-traded investments		0	0
Total Assets		564	1,716
Liabilities:
Derivative liabilities, net	[1]	3,456	2,582
Deferred compensation		0	0
Total liabilities		3,456	2,582
MGE [Member] | Recurring [Member]
Assets:
Derivative assets, net	[1]	1,445	3,069
Exchange-traded investments		108	115
Total Assets		1,553	3,184
Liabilities:
Derivative liabilities, net	[1]	6,462	8,163
Deferred compensation		5,050	4,743
Total liabilities		11,512	12,906
MGE [Member] | Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	[1]	881	1,353
Exchange-traded investments		108	115
Total Assets		989	1,468
Liabilities:
Derivative liabilities, net	[1]	3,006	5,581
Deferred compensation		0	0
Total liabilities		3,006	5,581
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		5,050	4,743
Total liabilities		5,050	4,743
MGE [Member] | Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	[1]	564	1,716
Exchange-traded investments		0	0
Total Assets		564	1,716
Liabilities:
Derivative liabilities, net	[1]	3,456	2,582
Deferred compensation		0	0
Total liabilities		$ 3,456	$ 2,582

[1] As of June 30, 2023, and December 31, 2022, collateral of $5.4 million and $5.2 million, respectively, 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.