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v3.19.3.a.u2

Label | Element | Value
--- | --- | ---
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | $ 174,193,000
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 179,464,000
Non Asset Retirement Obligation Removal Cost [Member] |  |
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 26,543,000
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 19,891,000
Transmission Costs [Member] |  |
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 5,476,000
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 6,019,000
Elm Road Regulatory Liability [Member] |  |
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 2,515,000
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 2,322,000
PurchasedGasAdjustmentMember [Member] |  |
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 1,864,000
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 1,186,000
Deferred Fuel Savings [Member] |  |
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 1,794,000
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 9,504,000
Renewable Energy Credits [Member] |  |
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 558,000
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 700,000
Other Regulatory Liability [Member] |  |
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 1,066,000
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 1,074,000
Income Taxes [Member] |  |
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 129,528,000
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 135,449,000
Pension and Other Postretirement Plans Costs [Member] |  |
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | 4,499,000
Regulatory Liabilities | us-gaap_RegulatoryLiabilities | $ 3,669,000

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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
Name: | us-gaap_RegulatoryLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_RegulatoryLiabilityAxis=mgee_NonAssetRetirementObligationRemovalCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RegulatoryLiabilityAxis=mgee_TransmissioncostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RegulatoryLiabilityAxis=mgee_ElmRoadRegulatoryLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RegulatoryLiabilityAxis=mgee_DeferredFuelSavingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RegulatoryLiabilityAxis=mgee_RenewableEnergyCreditsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RegulatoryLiabilityAxis=mgee_OtherRegulatoryLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RegulatoryLiabilityAxis=us-gaap_DeferredIncomeTaxChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_RegulatoryLiabilityAxis=us-gaap_PensionAndOtherPostretirementPlansCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |