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| 0000067716-22-000073.txt | 2022-11-18 08:34:14 | |
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| FilingSummary.xml | 1679 | 2022-11-18 08:34:14 |
| Financial_Report.xlsx | 5711 | 2022-11-18 08:34:14 |
| mdu-20221117.htm | 36214 | 2022-11-18 08:34:14 |
| mdu-20221117.xsd | 2137 | 2022-11-18 08:34:14 |
| mdu-20221117_def.xml | 14762 | 2022-11-18 08:34:14 |
| mdu-20221117_htm.xml | 11409 | 2022-11-18 08:34:14 |
| mdu-20221117_lab.xml | 28551 | 2022-11-18 08:34:14 |
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