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 0000067716-20-000051-index-headers.html | 2020-11-04 17:06:01 | |
| 0000067716-20-000051-index.html | 2020-11-04 17:06:01 | |
| 0000067716-20-000051.txt | 2020-11-04 17:06:01 | |
 0000067716-20-000051-xbrl.zip | 37550 | 2020-11-04 17:06:01 |
| a2020q3ex99.htm | 476394 | 2020-11-04 17:06:01 |
| FilingSummary.xml | 1711 | 2020-11-04 17:06:01 |
| Financial_Report.xlsx | 5481 | 2020-11-04 17:06:01 |
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| mdu-20201104.xsd | 2416 | 2020-11-04 17:06:01 |
| mdu-20201104_cal.xml | 711 | 2020-11-04 17:06:01 |
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| mdu-20201104_htm.xml | 11211 | 2020-11-04 17:06:01 |
| mdu-20201104_lab.xml | 29024 | 2020-11-04 17:06:01 |
| mdu-20201104_pre.xml | 15562 | 2020-11-04 17:06:01 |
 mdurirpressreleasebasa181a.jpg | 748436 | 2020-11-04 17:06:01 |
| MetaLinks.json | 20284 | 2020-11-04 17:06:01 |
| R1.htm | 40402 | 2020-11-04 17:06:01 |
| report.css | 2767 | 2020-11-04 17:06:01 |
| Show.js | 1085 | 2020-11-04 17:06:01 |