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| 0000067716-20-000060-index.html | 2020-11-19 16:57:59 | |
| 0000067716-20-000060.txt | 2020-11-19 16:57:59 | |
 0000067716-20-000060-xbrl.zip | 17869 | 2020-11-19 16:57:59 |
| a2020ex99-capexforecast.htm | 38380 | 2020-11-19 16:57:59 |
| FilingSummary.xml | 1723 | 2020-11-19 16:57:59 |
| Financial_Report.xlsx | 5478 | 2020-11-19 16:57:59 |
| mdu-20201119.htm | 32297 | 2020-11-19 16:57:59 |
| mdu-20201119.xsd | 2416 | 2020-11-19 16:57:59 |
| mdu-20201119_cal.xml | 711 | 2020-11-19 16:57:59 |
| mdu-20201119_def.xml | 14946 | 2020-11-19 16:57:59 |
| mdu-20201119_htm.xml | 11211 | 2020-11-19 16:57:59 |
| mdu-20201119_lab.xml | 29024 | 2020-11-19 16:57:59 |
| mdu-20201119_pre.xml | 15562 | 2020-11-19 16:57:59 |
 mdurirpressreleasebasa181a.jpg | 748436 | 2020-11-19 16:57:59 |
| MetaLinks.json | 20284 | 2020-11-19 16:57:59 |
| R1.htm | 40401 | 2020-11-19 16:57:59 |
| report.css | 2767 | 2020-11-19 16:57:59 |
| Show.js | 1085 | 2020-11-19 16:57:59 |