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Fair Value of Financial Instruments (Details-2) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets:    
Collateral posted against derivative positions $ 700  
Liabilities:    
Collateral posted against derivative positions   $ 1,500
Recurring [Member]    
Assets:    
Derivatives 2,521 [1] 303
Total Assets 4,302 1,574
Liabilities:    
Derivatives 16,538 27,178 [2]
Deferred compensation 3,349 3,157
Total liabilities 19,887 30,335
Recurring [Member] | Exchange Traded [Member]    
Assets:    
Available-for-sale securities 1,781 1,271
Recurring [Member] | Level 1 [Member]    
Assets:    
Derivatives 1,975 [1] 189
Total Assets 3,756 1,460
Liabilities:    
Derivatives 265 608 [2]
Deferred compensation 0 0
Total liabilities 265 608
Recurring [Member] | Level 1 [Member] | Exchange Traded [Member]    
Assets:    
Available-for-sale securities 1,781 1,271
Recurring [Member] | Level 2 [Member]    
Assets:    
Derivatives 0 [1] 0
Total Assets 0 0
Liabilities:    
Derivatives 0 0 [2]
Deferred compensation 3,349 3,157
Total liabilities 3,349 3,157
Recurring [Member] | Level 2 [Member] | Exchange Traded [Member]    
Assets:    
Available-for-sale securities 0 0
Recurring [Member] | Level 3 [Member]    
Assets:    
Derivatives 546 [1] 114
Total Assets 546 114
Liabilities:    
Derivatives 16,273 26,570 [2]
Deferred compensation 0 0
Total liabilities 16,273 26,570
Recurring [Member] | Level 3 [Member] | Exchange Traded [Member]    
Assets:    
Available-for-sale securities 0 0
MGE [Member]    
Assets:    
Collateral posted against derivative positions 700  
Liabilities:    
Collateral posted against derivative positions   1,500
MGE [Member] | Recurring [Member]    
Assets:    
Derivatives 2,521 [1] 303
Total Assets 2,982 512
Liabilities:    
Derivatives 16,538 27,178 [2]
Deferred compensation 3,349 3,157
Total liabilities 19,887 30,335
MGE [Member] | Recurring [Member] | Exchange Traded [Member]    
Assets:    
Available-for-sale securities 461 209
MGE [Member] | Recurring [Member] | Level 1 [Member]    
Assets:    
Derivatives 1,975 [1] 189
Total Assets 2,436 398
Liabilities:    
Derivatives 265 608 [2]
Deferred compensation 0 0
Total liabilities 265 608
MGE [Member] | Recurring [Member] | Level 1 [Member] | Exchange Traded [Member]    
Assets:    
Available-for-sale securities 461 209
MGE [Member] | Recurring [Member] | Level 2 [Member]    
Assets:    
Derivatives 0 [1] 0
Total Assets 0 0
Liabilities:    
Derivatives 0 0 [2]
Deferred compensation 3,349 3,157
Total liabilities 3,349 3,157
MGE [Member] | Recurring [Member] | Level 2 [Member] | Exchange Traded [Member]    
Assets:    
Available-for-sale securities 0 0
MGE [Member] | Recurring [Member] | Level 3 [Member]    
Assets:    
Derivatives 546 [1] 114
Total Assets 546 114
Liabilities:    
Derivatives 16,273 26,570 [2]
Deferred compensation 0 0
Total liabilities 16,273 26,570
MGE [Member] | Recurring [Member] | Level 3 [Member] | Exchange Traded [Member]    
Assets:    
Available-for-sale securities $ 0 $ 0
[1] These amounts are shown gross and exclude $0.7 million of collateral against derivative positions owed to counterparties under a master netting agreement as of September 30, 2020.
[2] These amounts are shown gross and exclude $1.5 million of collateral that was posted against derivative positions with counterparties as December 31, 2019.