Parent Directory| Name | Size | Last Modified |
|---|---|---|
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| 0000067716-22-000007-index.html | 2022-02-09 17:11:10 | |
| 0000067716-22-000007.txt | 2022-02-09 17:11:10 | |
 0000067716-22-000007-xbrl.zip | 45366 | 2022-02-09 17:11:10 |
| a2021earningsreleaseex-99.htm | 711836 | 2022-02-09 17:11:10 |
| FilingSummary.xml | 1698 | 2022-02-09 17:11:10 |
| Financial_Report.xlsx | 5701 | 2022-02-09 17:11:10 |
| mdu-20220209.htm | 32537 | 2022-02-09 17:11:10 |
| mdu-20220209.xsd | 2156 | 2022-02-09 17:11:10 |
| mdu-20220209_def.xml | 14890 | 2022-02-09 17:11:10 |
| mdu-20220209_htm.xml | 11207 | 2022-02-09 17:11:10 |
| mdu-20220209_lab.xml | 28968 | 2022-02-09 17:11:10 |
| mdu-20220209_pre.xml | 15506 | 2022-02-09 17:11:10 |
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| R1.htm | 40356 | 2022-02-09 17:11:10 |
| report.css | 2767 | 2022-02-09 17:11:10 |
| Show.js | 1085 | 2022-02-09 17:11:10 |