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Commitments and Contingencies (Details-2) $ in Thousands | Jun. 30, 2016 USD ($)
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Operating expense purchase contracts [Abstract] |  |
Purchase obligation, 2016 | $ 21,656 |
Purchase obligation, 2017 | 38,136 |
Purchase obligation, 2018 | 24,833 |
Purchase obligation, 2019 | 23,048 |
Purchase obligation, 2020 | 16,274 |
Purchase obligation, Thereafter | 32,595 |
Natural Gas, Transportation and Storage [Member] |  |
Operating expense purchase contracts [Abstract] |  |
Purchase obligation, 2016 | 10,621 | [1]
Purchase obligation, 2017 | 25,044 | [1]
Purchase obligation, 2018 | 24,833 | [1]
Purchase obligation, 2019 | 23,048 | [1]
Purchase obligation, 2020 | 16,274 | [1]
Purchase obligation, Thereafter | 32,595 | [1]
Natual Gas, Supply [Member] |  |
Operating expense purchase contracts [Abstract] |  |
Purchase obligation, 2016 | 11,035 | [2]
Purchase obligation, 2017 | 13,092 | [2]
Purchase obligation, 2018 | 0 | [2]
Purchase obligation, 2019 | 0 | [2]
Purchase obligation, 2020 | 0 | [2]
Purchase obligation, Thereafter | $ 0 | [2]
[1] | MGE's natural gas transportation and storage contracts require fixed monthly payments for firm supply pipeline transportation and storage capacity. The pricing components of the fixed monthly payments for the transportation and storage contracts are established by FERC but may be subject to change . Management expects to recover these costs in future customer rates .
[2] | These commitments include market-based pricing. Management expects to recover these costs in future customer rates .

X
- Definition Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_PurchaseObligationFiscalYearMaturityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum amount of purchase arrangement maturing in the remainder of the fiscal year following the latest fiscal year ended. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=mgee_NaturalGasTransportationAndStorageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=mgee_NatualGasSupplyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |