Fair Value of Financial Instruments (Details-2) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Liabilities:
Derivative, right to reclaim collateral		$ 3,000	$ 5,400
Recurring [Member]
Assets:
Derivative assets, net	[1]	502	598
Exchange-traded investments		2,087	2,034
Total Assets		2,589	2,632
Liabilities:
Derivative liabilities, net	[1]	3,511	5,824
Deferred compensation		5,629	5,246
Total liabilities		9,140	11,070
Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	[1]	373	352
Exchange-traded investments		2,087	2,034
Total Assets		2,460	2,386
Liabilities:
Derivative liabilities, net	[1]	1,656	2,974
Deferred compensation		0	0
Total liabilities		1,656	2,974
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		5,629	5,246
Total liabilities		5,629	5,246
Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	[1]	129	246
Exchange-traded investments		0	0
Total Assets		129	246
Liabilities:
Derivative liabilities, net	[1]	1,855	2,850
Deferred compensation		0	0
Total liabilities		1,855	2,850
MGE [Member] | Recurring [Member]
Assets:
Derivative assets, net	[1]	502	598
Exchange-traded investments		59	60
Total Assets		561	658
Liabilities:
Derivative liabilities, net	[1]	3,511	5,824
Deferred compensation		5,629	5,246
Total liabilities		9,140	11,070
MGE [Member] | Recurring [Member] | Level 1 [Member]
Assets:
Derivative assets, net	[1]	373	352
Exchange-traded investments		59	60
Total Assets		432	412
Liabilities:
Derivative liabilities, net	[1]	1,656	2,974
Deferred compensation		0	0
Total liabilities		1,656	2,974
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		5,629	5,246
Total liabilities		5,629	5,246
MGE [Member] | Recurring [Member] | Level 3 [Member]
Assets:
Derivative assets, net	[1]	129	246
Exchange-traded investments		0	0
Total Assets		129	246
Liabilities:
Derivative liabilities, net	[1]	1,855	2,850
Deferred compensation		0	0
Total liabilities		$ 1,855	$ 2,850

[1] As of March 31, 2024, and December 31, 2023, collateral of $3.0 million and $5.4 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.