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| 0000067716-19-000081-index.html | 2019-11-18 17:24:35 | |
| 0000067716-19-000081.txt | 2019-11-18 17:24:35 | |
 0000067716-19-000081-xbrl.zip | 19590 | 2019-11-18 17:24:35 |
| a2019ex99-capexforecast.htm | 50219 | 2019-11-18 17:24:35 |
| a2019form8-kcapexforec.htm | 40917 | 2019-11-18 17:24:35 |
| a2019form8-kcapexforec_htm.xml | 4488 | 2019-11-18 17:24:35 |
| FilingSummary.xml | 1753 | 2019-11-18 17:24:35 |
| Financial_Report.xlsx | 5816 | 2019-11-18 17:24:35 |
| mdu-20191118.xsd | 4562 | 2019-11-18 17:24:35 |
| mdu-20191118_cal.xml | 609 | 2019-11-18 17:24:35 |
| mdu-20191118_def.xml | 14577 | 2019-11-18 17:24:35 |
| mdu-20191118_lab.xml | 31381 | 2019-11-18 17:24:35 |
| mdu-20191118_pre.xml | 16430 | 2019-11-18 17:24:35 |
 mdurirpressreleasebasa07.jpg | 748436 | 2019-11-18 17:24:35 |
| MetaLinks.json | 21295 | 2019-11-18 17:24:35 |
| R1.htm | 40396 | 2019-11-18 17:24:35 |
| report.css | 2767 | 2019-11-18 17:24:35 |
| Show.js | 1085 | 2019-11-18 17:24:35 |