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| 0000067716-20-000063-index.html | 2020-12-14 08:25:10 | |
| 0000067716-20-000063.txt | 2020-12-14 08:25:10 | |
 0000067716-20-000063-xbrl.zip | 16045 | 2020-12-14 08:25:10 |
| a2020ex99-earningsguid.htm | 7137 | 2020-12-14 08:25:10 |
| FilingSummary.xml | 1722 | 2020-12-14 08:25:10 |
| Financial_Report.xlsx | 5478 | 2020-12-14 08:25:10 |
| mdu-20201214.htm | 32452 | 2020-12-14 08:25:10 |
| mdu-20201214.xsd | 2416 | 2020-12-14 08:25:10 |
| mdu-20201214_cal.xml | 711 | 2020-12-14 08:25:10 |
| mdu-20201214_def.xml | 14946 | 2020-12-14 08:25:10 |
| mdu-20201214_htm.xml | 11211 | 2020-12-14 08:25:10 |
| mdu-20201214_lab.xml | 29024 | 2020-12-14 08:25:10 |
| mdu-20201214_pre.xml | 15562 | 2020-12-14 08:25:10 |
 mdurirpressreleasebasa071a.jpg | 748436 | 2020-12-14 08:25:10 |
| MetaLinks.json | 20284 | 2020-12-14 08:25:10 |
| R1.htm | 40401 | 2020-12-14 08:25:10 |
| report.css | 2767 | 2020-12-14 08:25:10 |
| Show.js | 1085 | 2020-12-14 08:25:10 |