Parent Directory| Name | Size | Last Modified |
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| 0000067716-23-000085-index.html | 2023-07-10 17:08:09 | |
| 0000067716-23-000085.txt | 2023-07-10 17:08:09 | |
 0000067716-23-000085-xbrl.zip | 16858 | 2023-07-10 17:08:09 |
| a2023exhibit99csg.htm | 20389 | 2023-07-10 17:08:09 |
| FilingSummary.xml | 1671 | 2023-07-10 17:08:09 |
| Financial_Report.xlsx | 5719 | 2023-07-10 17:08:09 |
| mdu-20230710.htm | 29615 | 2023-07-10 17:08:09 |
| mdu-20230710.xsd | 2139 | 2023-07-10 17:08:09 |
| mdu-20230710_def.xml | 14764 | 2023-07-10 17:08:09 |
| mdu-20230710_htm.xml | 4279 | 2023-07-10 17:08:09 |
| mdu-20230710_lab.xml | 28553 | 2023-07-10 17:08:09 |
| mdu-20230710_pre.xml | 15384 | 2023-07-10 17:08:09 |
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| R1.htm | 39852 | 2023-07-10 17:08:09 |
| report.css | 2767 | 2023-07-10 17:08:09 |
| Show.js | 1085 | 2023-07-10 17:08:09 |