{"cik":1161728,"company":{"entity_status":null,"filings":[{"accession":"0001193125-26-360327","document":"mgee-20260821.htm","filed":"2026-08-21","form":"8-K","items":"8.01,9.01","report_date":"2026-08-21"},{"accession":"0001193125-26-359468","document":"xslF345X06/ownership.xml","filed":"2026-08-20","form":"4","items":"","report_date":"2026-08-19"},{"accession":"0001193125-26-334011","document":"mgee-20260805.htm","filed":"2026-08-05","form":"8-K","items":"2.02,7.01,9.01","report_date":"2026-08-05"},{"accession":"0001193125-26-333969","document":"mgee-20260630.htm","filed":"2026-08-05","form":"10-Q","items":"","report_date":"2026-06-30"},{"accession":"0001193125-26-279300","document":"mgee-20260619.htm","filed":"2026-06-23","form":"8-K","items":"5.02,9.01","report_date":"2026-06-19"},{"accession":"0001193125-26-235741","document":"mgee-20260519.htm","filed":"2026-05-22","form":"8-K","items":"5.07","report_date":"2026-05-19"},{"accession":"0001193125-26-214813","document":"mgee-20260508.htm","filed":"2026-05-08","form":"8-K","items":"7.01,9.01","report_date":"2026-05-08"},{"accession":"0001193125-26-214717","document":"mgee-20260506.htm","filed":"2026-05-08","form":"8-K","items":"1.01,8.01,9.01","report_date":"2026-05-06"},{"accession":"0001193125-26-205689","document":"mgee-20260505.htm","filed":"2026-05-05","form":"8-K","items":"2.02,9.01","report_date":"2026-05-05"},{"accession":"0001193125-26-205678","document":"mgee-20260331.htm","filed":"2026-05-05","form":"10-Q","items":"","report_date":"2026-03-31"},{"accession":"0001193125-26-167136","document":"xslF345X06/ownership.xml","filed":"2026-04-21","form":"4","items":"","report_date":"2026-04-17"},{"accession":"0001193125-26-167047","document":"mgee-20260417.htm","filed":"2026-04-21","form":"8-K","items":"5.02,9.01","report_date":"2026-04-17"},{"accession":"0001161728-26-000005","document":"mgee-20260325.htm","filed":"2026-04-02","form":"DEF 14A","items":"","report_date":"2026-03-30"},{"accession":"0001193125-26-104002","document":"xslF345X05/ownership.xml","filed":"2026-03-12","form":"4","items":"","report_date":"2026-03-11"},{"accession":"0001193125-26-088907","document":"xslF345X05/ownership.xml","filed":"2026-03-03","form":"4","items":"","report_date":"2026-03-02"},{"accession":"0001193125-26-088441","document":"xslF345X05/ownership.xml","filed":"2026-03-03","form":"4","items":"","report_date":"2026-03-02"},{"accession":"0001193125-26-088418","document":"xslF345X05/ownership.xml","filed":"2026-03-03","form":"4","items":"","report_date":"2026-03-02"},{"accession":"0001193125-26-088358","document":"xslF345X05/ownership.xml","filed":"2026-03-03","form":"4","items":"","report_date":"2026-03-02"},{"accession":"0001193125-26-088315","document":"xslF345X05/ownership.xml","filed":"2026-03-03","form":"4","items":"","report_date":"2026-03-02"},{"accession":"0001193125-26-079800","document":"mgee-20260227.htm","filed":"2026-02-27","form":"8-K","items":"7.01,9.01","report_date":"2026-02-27"},{"accession":"0001193125-26-067481","document":"mgee-20260224.htm","filed":"2026-02-24","form":"8-K","items":"8.01,9.01","report_date":"2026-02-24"},{"accession":"0001193125-26-067050","document":"mgee-20260224.htm","filed":"2026-02-24","form":"8-K","items":"2.02,9.01","report_date":"2026-02-24"},{"accession":"0001193125-26-067036","document":"mgee-20251231.htm","filed":"2026-02-24","form":"10-K","items":"","report_date":"2025-12-31"},{"accession":"0001193125-26-028612","document":"mgee-20260127.htm","filed":"2026-01-29","form":"8-K","items":"1.02,9.01","report_date":"2026-01-27"},{"accession":"0001193125-26-023547","document":"mgee-20260122.htm","filed":"2026-01-27","form":"8-K","items":"1.01,2.03,9.01","report_date":"2026-01-22"},{"accession":"0001193125-25-272490","document":"mgee-20251107.htm","filed":"2025-11-07","form":"8-K","items":"7.01,9.01","report_date":"2025-11-07"},{"accession":"0001193125-25-266389","document":"mgee-20251105.htm","filed":"2025-11-05","form":"8-K","items":"2.02,9.01","report_date":"2025-11-05"},{"accession":"0001193125-25-266253","document":"mgee-20250930.htm","filed":"2025-11-05","form":"10-Q","items":"","report_date":"2025-09-30"},{"accession":"0001193125-25-240982","document":"mgee-20251014.htm","filed":"2025-10-16","form":"8-K","items":"1.01,2.03,9.01","report_date":"2025-10-14"},{"accession":"0000950170-25-109297","document":"mgee-20250815.htm","filed":"2025-08-15","form":"8-K","items":"8.01,9.01","report_date":"2025-08-15"},{"accession":"0000950170-25-103696","document":"mgee-20250806.htm","filed":"2025-08-06","form":"8-K","items":"2.02,7.01,9.01","report_date":"2025-08-06"},{"accession":"0000950170-25-103668","document":"mgee-20250630.htm","filed":"2025-08-06","form":"10-Q","items":"","report_date":"2025-06-30"},{"accession":"0000950170-25-076153","document":"mgee-20250520.htm","filed":"2025-05-22","form":"8-K","items":"5.07,9.01","report_date":"2025-05-20"},{"accession":"0000950170-25-073194","document":"mgee-20250516.htm","filed":"2025-05-16","form":"8-K","items":"7.01,9.01","report_date":"2025-05-16"},{"accession":"0000950170-25-065305","document":"mgee-20250507.htm","filed":"2025-05-07","form":"8-K","items":"2.02,9.01","report_date":"2025-05-07"},{"accession":"0000950170-25-065302","document":"mgee-20250331.htm","filed":"2025-05-07","form":"10-Q","items":"","report_date":"2025-03-31"},{"accession":"0000950170-25-050955","document":"mgee-20250403.htm","filed":"2025-04-04","form":"DEF 14A","items":"","report_date":"2025-04-03"},{"accession":"0000950170-25-027506","document":"mgee-20250221.htm","filed":"2025-02-26","form":"8-K","items":"5.02,9.01","report_date":"2025-02-21"},{"accession":"0000950170-25-026377","document":"mgee-20250225.htm","filed":"2025-02-25","form":"8-K","items":"7.01,9.01","report_date":"2025-02-25"},{"accession":"0000950170-25-026265","document":"mgee-20250225.htm","filed":"2025-02-25","form":"8-K","items":"2.02,9.01","report_date":"2025-02-25"}],"former_names":[],"gleif_parents":[],"headquarters":[{"latitude":43.07472222222222,"longitude":-89.38416666666667,"name":"Madison","precision":"headquarters locality","source":"wikidata","url":"https://www.wikidata.org/wiki/Q43788"}],"insiders":[{"accession":"0001193125-26-167136","acquired_disposed":"A","code":"A","date":"2026-04-17","derivative":false,"filed":"2026-04-21","following_shares":"35795.65","form":"4","owners":["Bushek Jared Joseph"],"plan_10b5_1":false,"price":"0.0","security":"Common Stock","shares":"25000.0"}],"legal_name":null,"lei":null,"lei_status":null,"lei_updated_at":null,"names":[],"parent_exceptions":[],"parents":[],"wikidata_id":"Q6715705"},"research_built_at":"2026-09-08T00:28:31.573928+00:00","sources":[{"coverage":"8005 issuers; up to 32 recent company reports and 8 ownership-change filings per issuer","id":"sec","license":"SEC public-information reuse","license_url":"https://www.sec.gov/about/privacy-information","name":"SEC submissions","retrieved_at":"2026-09-08T00:28:36.996621+00:00","status":"ok","url":"https://www.sec.gov/search-filings/edgar-application-programming-interfaces"},{"coverage":"1611 unambiguous CIK-linked entities; coverage is incomplete","id":"wikidata","license":"CC0-1.0","license_url":"https://www.wikidata.org/wiki/Wikidata:Licensing","name":"Wikidata structured data","retrieved_at":"2026-09-07T20:33:33.971872+00:00","status":"ok","url":"https://www.wikidata.org/"},{"coverage":"1177 checked identities; 0 unavailable records","id":"gleif","license":"CC0-1.0","license_url":"https://www.gleif.org/en/meta/lei-data-terms-of-use","name":"GLEIF legal entity reference data","retrieved_at":"2026-09-07T20:35:11.504394+00:00","status":"ok","url":"https://www.gleif.org/en/lei-data/gleif-api"},{"coverage":"4 selected series; gaps remain missing","id":"fed","license":"Public domain (selected government series)","license_url":"https://www.federalreserve.gov/disclaimer.htm","name":"Federal Reserve Board H.15","retrieved_at":"2026-09-08T00:28:58.131796+00:00","status":"ok","url":"https://www.federalreserve.gov/releases/h15/"},{"coverage":"9 selected series; gaps remain missing","id":"bls","license":"Public domain","license_url":"https://www.bls.gov/opub/copyright-information.htm","name":"Bureau of Labor Statistics","retrieved_at":"2026-09-08T00:28:59.313116+00:00","status":"ok","url":"https://www.bls.gov/developers/"},{"coverage":"2026 Q2: filings in this completed quarter; not a live transaction feed","id":"insiders","license":"SEC public-information reuse","license_url":"https://www.sec.gov/about/privacy-information","name":"SEC insider transactions","retrieved_at":"2026-09-07T20:35:31.647091+00:00","status":"ok","url":"https://www.sec.gov/data-research/sec-markets-data/insider-transactions-data-sets"}]}