XML 25 R42.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Commitments and Contingencies (Details-2) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013
Chattel Paper Purchase Agreement [Abstract] |
Chattel paper purchase agreement maximum interest | $ 10,000,000
Outstanding interest in chattel paper receivables | 4,300,000
Servicing asset recognized | 200,000
Smart Grid Investment Grant [Abstract] |
Smart Grid grant approval amount | 5,500,000
Total cost of proposed projects | 11,000,000
Smart grid expenditures to date | 9,600,000
One Year From Balance Sheet Date [Member] |
Chattel Paper Agreement Principal Payments [Abstract] |
Chattel paper agreement principal payments commitments | 531,000
Operating expense purchase contracts [Abstract] |
Coal commitments | 16,922,000
Purchase power commitments | 49,182,000
Other commitments | 1,939,000
Total purchase contracts | 68,043,000
Smart Grid Investment Grant [Abstract] |
Smart grid commitments to date | 900,000
More Than One And Within Two Years From Balance Sheet Date [Member] |
Chattel Paper Agreement Principal Payments [Abstract] |
Chattel paper agreement principal payments commitments | 554,000
Operating expense purchase contracts [Abstract] |
Coal commitments | 9,933,000
Purchase power commitments | 48,425,000
Other commitments | 0
Total purchase contracts | 58,358,000
More Than Two And Within Three Years From Balance Sheet Date [Member] |
Chattel Paper Agreement Principal Payments [Abstract] |
Chattel paper agreement principal payments commitments | 867,000
Operating expense purchase contracts [Abstract] |
Coal commitments | 9,252,000
Purchase power commitments | 47,293,000
Other commitments | 0
Total purchase contracts | 56,545,000
More Than Three And Within Four Years From Balance Sheet Date [Member] |
Chattel Paper Agreement Principal Payments [Abstract] |
Chattel paper agreement principal payments commitments | 791,000
Operating expense purchase contracts [Abstract] |
Coal commitments | 1,623,000
Purchase power commitments | 48,121,000
Other commitments | 0
Total purchase contracts | 49,744,000
More Than Four And Within Five Years From Balance Sheet Date [Member] |
Chattel Paper Agreement Principal Payments [Abstract] |
Chattel paper agreement principal payments commitments | 382,000
Operating expense purchase contracts [Abstract] |
Coal commitments | 1,040,000
Purchase power commitments | 49,242,000
Other commitments | 0
Total purchase contracts | $ 50,282,000

X
- Details
Name: | mgee_ChattelPaperAgreementPrincipalPaymentsAbstract
Namespace Prefix: | mgee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Chattel paper agreement principal payments. + References No definition available. + Details
Name: | mgee_ChattelPaperAgreementPrincipalPaymentsCommitments
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | mgee_ChattelPaperPurchaseAgreementAbstract
Namespace Prefix: | mgee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition MGE is party to a chattel paper purchase agreement with a financial institution under which it can sell or finance an undivided interest with recourse, in up to $10.0 million of the financing program receivables, until August 31, 2011. + References No definition available. + Details
Name: | mgee_ChattelPaperPurchaseAgreementMaximumInterest
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Coal commitments for the Columbia and Elm Road Units. + References No definition available. + Details
Name: | mgee_CoalCommitments
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | mgee_OperatingExpensePurchaseContractsCommitmentsAbstract
Namespace Prefix: | mgee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other Operating Commitments. + References No definition available. + Details
Name: | mgee_OtherOperatingExpensePurchaseCommitments
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Outstanding interest in chattel paper interest receivables. + References No definition available. + Details
Name: | mgee_OutstandingInterestInChattelPaperReceivables
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total purchase contracts. + References No definition available. + Details
Name: | mgee_PurchaseContractsNet
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase power commitments. + References No definition available. + Details
Name: | mgee_PurchasePowerCommitments
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Smart grid commitments. + References No definition available. + Details
Name: | mgee_SmartGridCommitments
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Expenditures incurred related to the smart grid projects. + References No definition available. + Details
Name: | mgee_SmartGridExpenditures
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition MGE approved grant for smart grid projects by the U.S. Department of Energy (DOE) under the federal stimulus program. + References No definition available. + Details
Name: | mgee_SmartGridGrantAmount
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | mgee_SmartGridInvestmentGrantAbstract
Namespace Prefix: | mgee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total cost of the proposed smart grid project including the grant approved by the U.S. Department of Energy (DOE) under the federal stimulus program. + References No definition available. + Details
Name: | mgee_TotalCostOfProposedProjects
Namespace Prefix: | mgee_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amortized carrying amount (balance) as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6863725&loc=d3e122739-111746 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph g(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 13A, 13B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6777056&loc=d3e120260-111741 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B10 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_ServicingAssetAtAmortizedValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant