Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000067716-21-000029-index-headers.html | 2021-05-12 16:06:38 | |
| 0000067716-21-000029-index.html | 2021-05-12 16:06:38 | |
| 0000067716-21-000029.txt | 2021-05-12 16:06:38 | |
 0000067716-21-000029-xbrl.zip | 15097 | 2021-05-12 16:06:38 |
| FilingSummary.xml | 1664 | 2021-05-12 16:06:38 |
| Financial_Report.xlsx | 5691 | 2021-05-12 16:06:38 |
| mdu-20210511.htm | 53970 | 2021-05-12 16:06:38 |
| mdu-20210511.xsd | 2403 | 2021-05-12 16:06:38 |
| mdu-20210511_cal.xml | 699 | 2021-05-12 16:06:38 |
| mdu-20210511_def.xml | 14930 | 2021-05-12 16:06:38 |
| mdu-20210511_htm.xml | 11211 | 2021-05-12 16:06:38 |
| mdu-20210511_lab.xml | 29024 | 2021-05-12 16:06:38 |
| mdu-20210511_pre.xml | 15550 | 2021-05-12 16:06:38 |
| MetaLinks.json | 20162 | 2021-05-12 16:06:38 |
| R1.htm | 40393 | 2021-05-12 16:06:38 |
| report.css | 2767 | 2021-05-12 16:06:38 |
| Show.js | 1085 | 2021-05-12 16:06:38 |