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Madison Gas and Electric Company Consolidated Statements of Common Equity (Unaudited) (USD $) In Thousands | Total USD ($) | MGE [Member] USD ($) | Common Stock [Member] | Common Stock [Member] MGE [Member] USD ($) | Additional Paid-In Capital [Member] MGE [Member] USD ($) | Retained Earnings [Member] MGE [Member] USD ($) | Accumulated Other Comprehensive (Loss)/ Income [Member] USD ($) | Accumulated Other Comprehensive (Loss)/ Income [Member] MGE [Member] USD ($) | Noncontrolling Interest [Member] MGE [Member] USD ($)
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Beginning balance, value at Dec. 31, 2011 |  | $ 527,277 |  | $ 17,348 | $ 192,417 | $ 203,114 |  | $ 47 | $ 114,351
Beginning balance, shares at Dec. 31, 2011 |  |  | 23,114 | 17,348 |  |  |  |  |
Net Income |  | 16,214 |  |  |  | 10,142 |  |  | 6,072
Other comprehensive income (loss) | 7 | (16) |  |  |  |  | 7 | (16) |
Cash dividends paid to parent by MGE |  | (6,728) |  |  |  | (6,728) |  |  |
Equity contribution received by noncontrolling interest |  | 355 |  |  |  |  |  |  | 355
Distributions to parent from noncontrolling interest |  | 0 |  |  |  |  |  |  |
Ending balance, value at Mar. 31, 2012 |  | 537,102 |  | 17,348 | 192,417 | 206,528 |  | 31 | 120,778
Ending balance, shares at Mar. 31, 2012 |  |  | 23,114 | 17,348 |  |  |  |  |
Beginning balance, value at Dec. 31, 2012 |  | 550,766 |  | 17,348 | 192,417 | 223,527 |  | 4 | 117,470
Beginning balance, shares at Dec. 31, 2012 |  |  | 23,114 | 17,348 |  |  |  |  |
Net Income |  | 22,560 |  |  |  | 15,734 |  |  | 6,826
Other comprehensive income (loss) | 65 | 27 |  |  |  |  | 65 | 27 |
Cash dividends paid to parent by MGE |  | 0 |  |  |  |  |  |  |
Equity contribution received by noncontrolling interest |  | 178 |  |  |  |  |  |  | 178
Distributions to parent from noncontrolling interest |  | (5,500) |  |  |  |  |  |  | (5,500)
Ending balance, value at Mar. 31, 2013 |  | $ 568,031 |  | $ 17,348 | $ 192,417 | $ 239,261 |  | $ 31 | $ 118,974
Ending balance, shares at Mar. 31, 2013 |  |  | 23,114 | 17,348 |  |  |  |  |

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