Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000067716-20-000041-index-headers.html | 2020-08-04 16:43:38 | |
| 0000067716-20-000041-index.html | 2020-08-04 16:43:38 | |
| 0000067716-20-000041.txt | 2020-08-04 16:43:38 | |
 0000067716-20-000041-xbrl.zip | 43697 | 2020-08-04 16:43:38 |
| a2020q2ex99.htm | 853583 | 2020-08-04 16:43:38 |
| FilingSummary.xml | 1711 | 2020-08-04 16:43:38 |
| Financial_Report.xlsx | 5481 | 2020-08-04 16:43:38 |
| mdu-20200804.htm | 38439 | 2020-08-04 16:43:38 |
| mdu-20200804.xsd | 2416 | 2020-08-04 16:43:38 |
| mdu-20200804_cal.xml | 711 | 2020-08-04 16:43:38 |
| mdu-20200804_def.xml | 14946 | 2020-08-04 16:43:38 |
| mdu-20200804_htm.xml | 11192 | 2020-08-04 16:43:38 |
| mdu-20200804_lab.xml | 29024 | 2020-08-04 16:43:38 |
| mdu-20200804_pre.xml | 15562 | 2020-08-04 16:43:38 |
 mdurirpressreleasebasa.jpg | 748436 | 2020-08-04 16:43:38 |
| MetaLinks.json | 20284 | 2020-08-04 16:43:38 |
| R1.htm | 40402 | 2020-08-04 16:43:38 |
| report.css | 2767 | 2020-08-04 16:43:38 |
| Show.js | 1085 | 2020-08-04 16:43:38 |