Parent Directory| Name | Size | Last Modified |
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| 0000067716-25-000041-index.html | 2025-05-08 08:32:14 | |
| 0000067716-25-000041.txt | 2025-05-08 08:32:14 | |
 0000067716-25-000041-xbrl.zip | 27104 | 2025-05-08 08:32:14 |
| a2025q1ex99.htm | 245488 | 2025-05-08 08:32:14 |
| FilingSummary.xml | 1663 | 2025-05-08 08:32:14 |
| Financial_Report.xlsx | 5744 | 2025-05-08 08:32:14 |
 header01.jpg | 24712 | 2025-05-08 08:32:14 |
| mdu-20250508.htm | 31229 | 2025-05-08 08:32:14 |
| mdu-20250508.xsd | 2033 | 2025-05-08 08:32:14 |
| mdu-20250508_def.xml | 14731 | 2025-05-08 08:32:14 |
| mdu-20250508_htm.xml | 2824 | 2025-05-08 08:32:14 |
| mdu-20250508_lab.xml | 26114 | 2025-05-08 08:32:14 |
| mdu-20250508_pre.xml | 15396 | 2025-05-08 08:32:14 |
| MetaLinks.json | 20029 | 2025-05-08 08:32:14 |
| R1.htm | 39837 | 2025-05-08 08:32:14 |
| report.css | 2767 | 2025-05-08 08:32:14 |
| Show.js | 1085 | 2025-05-08 08:32:14 |