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 0000067716-20-000056-index-headers.html | 2020-11-12 16:25:05 | |
| 0000067716-20-000056-index.html | 2020-11-12 16:25:05 | |
| 0000067716-20-000056.txt | 2020-11-12 16:25:05 | |
 0000067716-20-000056-xbrl.zip | 43621 | 2020-11-12 16:25:05 |
| ex101deferredcompplana.htm | 108367 | 2020-11-12 16:25:05 |
| ex102deferredcompplan.htm | 145699 | 2020-11-12 16:25:05 |
| FilingSummary.xml | 1765 | 2020-11-12 16:25:05 |
| Financial_Report.xlsx | 5478 | 2020-11-12 16:25:05 |
| mdu-20201112.htm | 37574 | 2020-11-12 16:25:05 |
| mdu-20201112.xsd | 2416 | 2020-11-12 16:25:05 |
| mdu-20201112_cal.xml | 711 | 2020-11-12 16:25:05 |
| mdu-20201112_def.xml | 14946 | 2020-11-12 16:25:05 |
| mdu-20201112_htm.xml | 11224 | 2020-11-12 16:25:05 |
| mdu-20201112_lab.xml | 29024 | 2020-11-12 16:25:05 |
| mdu-20201112_pre.xml | 15562 | 2020-11-12 16:25:05 |
| MetaLinks.json | 20284 | 2020-11-12 16:25:05 |
| R1.htm | 40401 | 2020-11-12 16:25:05 |
| report.css | 2767 | 2020-11-12 16:25:05 |
| Show.js | 1085 | 2020-11-12 16:25:05 |