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Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Receivables, Net    
Reserve for uncollectible accounts receivable $ 3,972us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 4,329us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Reserve for uncollectible other accounts receivable 401us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables 420us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables
MGE [Member]    
Receivables, Net    
Reserve for uncollectible accounts receivable 3,972us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 4,329us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Reserve for uncollectible other accounts receivable $ 401us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 $ 420us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember