Parent Directory| Name | Size | Last Modified |
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 0000067716-21-000023-index-headers.html | 2021-05-05 17:55:18 | |
| 0000067716-21-000023-index.html | 2021-05-05 17:55:18 | |
| 0000067716-21-000023.txt | 2021-05-05 17:55:18 | |
 0000067716-21-000023-xbrl.zip | 34170 | 2021-05-05 17:55:18 |
| a2021q1ex99.htm | 397389 | 2021-05-05 17:55:18 |
| FilingSummary.xml | 1711 | 2021-05-05 17:55:18 |
| Financial_Report.xlsx | 5702 | 2021-05-05 17:55:18 |
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| mdu-20210505.xsd | 2416 | 2021-05-05 17:55:18 |
| mdu-20210505_cal.xml | 711 | 2021-05-05 17:55:18 |
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| mdu-20210505_htm.xml | 11211 | 2021-05-05 17:55:18 |
| mdu-20210505_lab.xml | 29024 | 2021-05-05 17:55:18 |
| mdu-20210505_pre.xml | 15562 | 2021-05-05 17:55:18 |
 mdurirpressreleasebasa181.jpg | 748436 | 2021-05-05 17:55:18 |
| MetaLinks.json | 20284 | 2021-05-05 17:55:18 |
| R1.htm | 40400 | 2021-05-05 17:55:18 |
| report.css | 2767 | 2021-05-05 17:55:18 |
| Show.js | 1085 | 2021-05-05 17:55:18 |