Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000067716-21-000052-index-headers.html | 2021-11-03 16:57:51 | |
| 0000067716-21-000052-index.html | 2021-11-03 16:57:51 | |
| 0000067716-21-000052.txt | 2021-11-03 16:57:51 | |
 0000067716-21-000052-xbrl.zip | 38481 | 2021-11-03 16:57:51 |
| a2021q3ex99.htm | 566992 | 2021-11-03 16:57:51 |
| FilingSummary.xml | 1674 | 2021-11-03 16:57:51 |
| Financial_Report.xlsx | 5703 | 2021-11-03 16:57:51 |
| mdu-20211103.htm | 32421 | 2021-11-03 16:57:51 |
| mdu-20211103.xsd | 2162 | 2021-11-03 16:57:51 |
| mdu-20211103_def.xml | 14946 | 2021-11-03 16:57:51 |
| mdu-20211103_htm.xml | 11211 | 2021-11-03 16:57:51 |
| mdu-20211103_lab.xml | 29024 | 2021-11-03 16:57:51 |
| mdu-20211103_pre.xml | 15562 | 2021-11-03 16:57:51 |
 mdurirpressreleasebasa18a.jpg | 748436 | 2021-11-03 16:57:51 |
| MetaLinks.json | 19946 | 2021-11-03 16:57:51 |
| R1.htm | 40401 | 2021-11-03 16:57:51 |
| report.css | 2767 | 2021-11-03 16:57:51 |
| Show.js | 1085 | 2021-11-03 16:57:51 |