Parent Directory| Name | Size | Last Modified |
|---|---|---|
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| 0000067716-23-000062-index.html | 2023-05-04 08:28:06 | |
| 0000067716-23-000062.txt | 2023-05-04 08:28:06 | |
 0000067716-23-000062-xbrl.zip | 18177 | 2023-05-04 08:28:06 |
| a2023ex99krcspinapproval.htm | 14063 | 2023-05-04 08:28:06 |
| FilingSummary.xml | 1678 | 2023-05-04 08:28:06 |
| Financial_Report.xlsx | 5716 | 2023-05-04 08:28:06 |
| mdu-20230503.htm | 41029 | 2023-05-04 08:28:06 |
| mdu-20230503.xsd | 2137 | 2023-05-04 08:28:06 |
| mdu-20230503_def.xml | 14762 | 2023-05-04 08:28:06 |
| mdu-20230503_htm.xml | 11289 | 2023-05-04 08:28:06 |
| mdu-20230503_lab.xml | 28551 | 2023-05-04 08:28:06 |
| mdu-20230503_pre.xml | 15382 | 2023-05-04 08:28:06 |
| MetaLinks.json | 19964 | 2023-05-04 08:28:06 |
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| R1.htm | 39851 | 2023-05-04 08:28:06 |
| report.css | 2767 | 2023-05-04 08:28:06 |
| Show.js | 1085 | 2023-05-04 08:28:06 |