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 0000067716-20-000025-index-headers.html | 2020-05-07 16:45:18 | |
| 0000067716-20-000025-index.html | 2020-05-07 16:45:18 | |
| 0000067716-20-000025.txt | 2020-05-07 16:45:18 | |
 0000067716-20-000025-xbrl.zip | 35961 | 2020-05-07 16:45:18 |
| a2020q1ex99.htm | 426859 | 2020-05-07 16:45:18 |
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| Financial_Report.xlsx | 5816 | 2020-05-07 16:45:18 |
| mdu-20200507.xsd | 4424 | 2020-05-07 16:45:18 |
| mdu-20200507_cal.xml | 609 | 2020-05-07 16:45:18 |
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| mdu-20200507_lab.xml | 31386 | 2020-05-07 16:45:18 |
| mdu-20200507_pre.xml | 16430 | 2020-05-07 16:45:18 |
 mdurirpressreleasebasa12.jpg | 748436 | 2020-05-07 16:45:18 |
| MetaLinks.json | 21231 | 2020-05-07 16:45:18 |
| R1.htm | 40395 | 2020-05-07 16:45:18 |
| report.css | 2767 | 2020-05-07 16:45:18 |
| Show.js | 1085 | 2020-05-07 16:45:18 |