Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000067716-22-000003-index-headers.html | 2022-01-10 17:14:31 | |
| 0000067716-22-000003-index.html | 2022-01-10 17:14:31 | |
| 0000067716-22-000003.txt | 2022-01-10 17:14:31 | |
 0000067716-22-000003-xbrl.zip | 13372 | 2022-01-10 17:14:31 |
| FilingSummary.xml | 1624 | 2022-01-10 17:14:31 |
| Financial_Report.xlsx | 5694 | 2022-01-10 17:14:31 |
| mdu-20220106.htm | 32314 | 2022-01-10 17:14:31 |
| mdu-20220106.xsd | 2143 | 2022-01-10 17:14:31 |
| mdu-20220106_def.xml | 14874 | 2022-01-10 17:14:31 |
| mdu-20220106_htm.xml | 11317 | 2022-01-10 17:14:31 |
| mdu-20220106_lab.xml | 28663 | 2022-01-10 17:14:31 |
| mdu-20220106_pre.xml | 15494 | 2022-01-10 17:14:31 |
| MetaLinks.json | 19495 | 2022-01-10 17:14:31 |
| R1.htm | 40349 | 2022-01-10 17:14:31 |
| report.css | 2767 | 2022-01-10 17:14:31 |
| Show.js | 1084 | 2022-01-10 17:14:31 |