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| 0000067716-23-000048.txt | 2023-04-11 16:41:33 | |
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| FilingSummary.xml | 1680 | 2023-04-11 16:41:33 |
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| mdu-20230411.htm | 29594 | 2023-04-11 16:41:33 |
| mdu-20230411.xsd | 2137 | 2023-04-11 16:41:33 |
| mdu-20230411_def.xml | 14762 | 2023-04-11 16:41:33 |
| mdu-20230411_htm.xml | 4279 | 2023-04-11 16:41:33 |
| mdu-20230411_lab.xml | 28551 | 2023-04-11 16:41:33 |
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