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

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