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| 0000067716-23-000044-index.html | 2023-04-10 07:37:28 | |
| 0000067716-23-000044.txt | 2023-04-10 07:37:28 | |
 0000067716-23-000044-xbrl.zip | 14994 | 2023-04-10 07:37:28 |
| a2023exhibit99krcyieldbonds.htm | 7464 | 2023-04-10 07:37:28 |
| FilingSummary.xml | 1681 | 2023-04-10 07:37:28 |
| Financial_Report.xlsx | 5713 | 2023-04-10 07:37:28 |
| mdu-20230410.htm | 30055 | 2023-04-10 07:37:28 |
| mdu-20230410.xsd | 2137 | 2023-04-10 07:37:28 |
| mdu-20230410_def.xml | 14762 | 2023-04-10 07:37:28 |
| mdu-20230410_htm.xml | 4279 | 2023-04-10 07:37:28 |
| mdu-20230410_lab.xml | 28551 | 2023-04-10 07:37:28 |
| mdu-20230410_pre.xml | 15382 | 2023-04-10 07:37:28 |
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| R1.htm | 39852 | 2023-04-10 07:37:28 |
| report.css | 2767 | 2023-04-10 07:37:28 |
| Show.js | 1085 | 2023-04-10 07:37:28 |