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Summary of Significant Accounting Principles (Tables) | 9 Months Ended
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Sep. 30, 2021
Cash, Cash Equivalents, And Restricted Cash [Abstract] |
Cash, Cash Equivalents, and Restricted Cash | The following table presents the components of total cash, cash equivalents, and restricted cash on the consolidated balance sheets.
|  | MGE Energy |  |  | MGE |
|  | September 30, |  |  | December 31, |  |  | September 30, |  |  | December 31, |
(In thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Cash and cash equivalents |  | $ | 70,454 |  |  | $ | 44,738 |  |  | $ | 57,003 |  |  | $ | 4,103 |
Restricted cash |  |  | 641 |  |  |  | 644 |  |  |  | 641 |  |  |  | 644 |
Receivable - margin account |  |  | 550 |  |  |  | 1,657 |  |  |  | 550 |  |  |  | 1,657 |
Cash, cash equivalents, and restricted cash |  | $ | 71,645 |  |  | $ | 47,039 |  |  | $ | 58,194 |  |  | $ | 6,404 |

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- Definition Tabular disclosure of the components of cash and cash equivalents, including restricted amounts. + References No definition available. + Details
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