Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000067716-20-000030-index-headers.html | 2020-05-13 13:03:44 | |
| 0000067716-20-000030-index.html | 2020-05-13 13:03:44 | |
| 0000067716-20-000030.txt | 2020-05-13 13:03:44 | |
 0000067716-20-000030-xbrl.zip | 15413 | 2020-05-13 13:03:44 |
| a20208-kstockholdersvo.htm | 66031 | 2020-05-13 13:03:44 |
| a20208-kstockholdersvo_htm.xml | 4467 | 2020-05-13 13:03:44 |
| FilingSummary.xml | 1708 | 2020-05-13 13:03:44 |
| Financial_Report.xlsx | 5813 | 2020-05-13 13:03:44 |
| mdu-20200512.xsd | 4424 | 2020-05-13 13:03:44 |
| mdu-20200512_cal.xml | 609 | 2020-05-13 13:03:44 |
| mdu-20200512_def.xml | 14527 | 2020-05-13 13:03:44 |
| mdu-20200512_lab.xml | 31386 | 2020-05-13 13:03:44 |
| mdu-20200512_pre.xml | 16430 | 2020-05-13 13:03:44 |
| MetaLinks.json | 21265 | 2020-05-13 13:03:44 |
| R1.htm | 40394 | 2020-05-13 13:03:44 |
| report.css | 2767 | 2020-05-13 13:03:44 |
| Show.js | 1085 | 2020-05-13 13:03:44 |