Parent Directory| Name | Size | Last Modified |
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| 0000067716-23-000051-index.html | 2023-04-25 16:39:24 | |
| 0000067716-23-000051.txt | 2023-04-25 16:39:24 | |
 0000067716-23-000051-xbrl.zip | 18396 | 2023-04-25 16:39:24 |
| a2023ex99krcyieldbondsclose.htm | 9659 | 2023-04-25 16:39:24 |
| FilingSummary.xml | 1681 | 2023-04-25 16:39:24 |
| Financial_Report.xlsx | 5714 | 2023-04-25 16:39:24 |
| mdu-20230425.htm | 44184 | 2023-04-25 16:39:24 |
| mdu-20230425.xsd | 2137 | 2023-04-25 16:39:24 |
| mdu-20230425_def.xml | 14762 | 2023-04-25 16:39:24 |
| mdu-20230425_htm.xml | 11289 | 2023-04-25 16:39:24 |
| mdu-20230425_lab.xml | 28551 | 2023-04-25 16:39:24 |
| mdu-20230425_pre.xml | 15382 | 2023-04-25 16:39:24 |
| MetaLinks.json | 19964 | 2023-04-25 16:39:24 |
 pressrelease.jpg | 85124 | 2023-04-25 16:39:24 |
| R1.htm | 39852 | 2023-04-25 16:39:24 |
| report.css | 2767 | 2023-04-25 16:39:24 |
| Show.js | 1085 | 2023-04-25 16:39:24 |