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|---|---|---|
 0000067716-19-000070-index-headers.html | 2019-10-30 09:13:44 | |
| 0000067716-19-000070-index.html | 2019-10-30 09:13:44 | |
| 0000067716-19-000070.txt | 2019-10-30 09:13:44 | |
 0000067716-19-000070-xbrl.zip | 37735 | 2019-10-30 09:13:44 |
| a2019q3ex99.htm | 538050 | 2019-10-30 09:13:44 |
| a2019q3form8-k.htm | 39312 | 2019-10-30 09:13:44 |
| a2019q3form8-k_htm.xml | 4629 | 2019-10-30 09:13:44 |
| FilingSummary.xml | 1717 | 2019-10-30 09:13:44 |
| Financial_Report.xlsx | 5815 | 2019-10-30 09:13:44 |
| mdu-20191029.xsd | 4562 | 2019-10-30 09:13:44 |
| mdu-20191029_cal.xml | 609 | 2019-10-30 09:13:44 |
| mdu-20191029_def.xml | 14527 | 2019-10-30 09:13:44 |
| mdu-20191029_lab.xml | 31381 | 2019-10-30 09:13:44 |
| mdu-20191029_pre.xml | 16430 | 2019-10-30 09:13:44 |
 mdurirpressreleasebasa12.jpg | 748436 | 2019-10-30 09:13:44 |
| MetaLinks.json | 21273 | 2019-10-30 09:13:44 |
| R1.htm | 40396 | 2019-10-30 09:13:44 |
| report.css | 2766 | 2019-10-30 09:13:44 |
| Show.js | 1085 | 2019-10-30 09:13:44 |