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| 0000067716-23-000063.txt | 2023-05-04 08:30:00 | |
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| a2023q1ex99.htm | 480138 | 2023-05-04 08:30:00 |
| FilingSummary.xml | 1679 | 2023-05-04 08:30:00 |
| Financial_Report.xlsx | 5724 | 2023-05-04 08:30:00 |
| mdu-20230504.htm | 32479 | 2023-05-04 08:30:00 |
| mdu-20230504.xsd | 2150 | 2023-05-04 08:30:00 |
| mdu-20230504_def.xml | 14778 | 2023-05-04 08:30:00 |
| mdu-20230504_htm.xml | 11289 | 2023-05-04 08:30:00 |
| mdu-20230504_lab.xml | 28856 | 2023-05-04 08:30:00 |
| mdu-20230504_pre.xml | 15394 | 2023-05-04 08:30:00 |
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| Show.js | 1085 | 2023-05-04 08:30:00 |