Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000067716-22-000031-index-headers.html | 2022-05-12 12:01:57 | |
| 0000067716-22-000031-index.html | 2022-05-12 12:01:57 | |
| 0000067716-22-000031.txt | 2022-05-12 12:01:57 | |
 0000067716-22-000031-xbrl.zip | 14595 | 2022-05-12 12:01:57 |
| FilingSummary.xml | 1634 | 2022-05-12 12:01:57 |
| Financial_Report.xlsx | 5691 | 2022-05-12 12:01:57 |
| mdu-20220510.htm | 54141 | 2022-05-12 12:01:57 |
| mdu-20220510.xsd | 2143 | 2022-05-12 12:01:57 |
| mdu-20220510_def.xml | 14874 | 2022-05-12 12:01:57 |
| mdu-20220510_htm.xml | 11304 | 2022-05-12 12:01:57 |
| mdu-20220510_lab.xml | 28968 | 2022-05-12 12:01:57 |
| mdu-20220510_pre.xml | 15494 | 2022-05-12 12:01:57 |
| MetaLinks.json | 19536 | 2022-05-12 12:01:57 |
| R1.htm | 40484 | 2022-05-12 12:01:57 |
| report.css | 2767 | 2022-05-12 12:01:57 |
| Show.js | 1084 | 2022-05-12 12:01:57 |