Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000067716-22-000067-index-headers.html | 2022-11-17 16:41:10 | |
| 0000067716-22-000067-index.html | 2022-11-17 16:41:10 | |
| 0000067716-22-000067.txt | 2022-11-17 16:41:10 | |
 0000067716-22-000067-xbrl.zip | 15971 | 2022-11-17 16:41:10 |
| exhibit99gray.htm | 8294 | 2022-11-17 16:41:10 |
| FilingSummary.xml | 1669 | 2022-11-17 16:41:10 |
| Financial_Report.xlsx | 5712 | 2022-11-17 16:41:10 |
| mdu-20221117.htm | 35392 | 2022-11-17 16:41:10 |
| mdu-20221117.xsd | 2137 | 2022-11-17 16:41:10 |
| mdu-20221117_def.xml | 14762 | 2022-11-17 16:41:10 |
| mdu-20221117_htm.xml | 11278 | 2022-11-17 16:41:10 |
| mdu-20221117_lab.xml | 28551 | 2022-11-17 16:41:10 |
| mdu-20221117_pre.xml | 15382 | 2022-11-17 16:41:10 |
| MetaLinks.json | 19432 | 2022-11-17 16:41:10 |
 pressreleasea.jpg | 85124 | 2022-11-17 16:41:10 |
| R1.htm | 39854 | 2022-11-17 16:41:10 |
| report.css | 2767 | 2022-11-17 16:41:10 |
| Show.js | 1085 | 2022-11-17 16:41:10 |