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| 0000067716-22-000027.txt | 2022-05-04 16:44:51 | |
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| a2022q1ex99.htm | 449143 | 2022-05-04 16:44:51 |
| FilingSummary.xml | 1681 | 2022-05-04 16:44:51 |
| Financial_Report.xlsx | 5701 | 2022-05-04 16:44:51 |
| mdu-20220504.htm | 32457 | 2022-05-04 16:44:51 |
| mdu-20220504.xsd | 2156 | 2022-05-04 16:44:51 |
| mdu-20220504_def.xml | 14890 | 2022-05-04 16:44:51 |
| mdu-20220504_htm.xml | 11267 | 2022-05-04 16:44:51 |
| mdu-20220504_lab.xml | 28968 | 2022-05-04 16:44:51 |
| mdu-20220504_pre.xml | 15506 | 2022-05-04 16:44:51 |
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| Show.js | 1085 | 2022-05-04 16:44:51 |