Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000067716-20-000006-index-headers.html | 2020-02-04 17:14:57 | |
| 0000067716-20-000006-index.html | 2020-02-04 17:14:57 | |
| 0000067716-20-000006.txt | 2020-02-04 17:14:57 | |
 0000067716-20-000006-xbrl.zip | 38726 | 2020-02-04 17:14:57 |
| a2019earningsreleaseex.htm | 563078 | 2020-02-04 17:14:57 |
| a2019form8-kearningsre.htm | 38907 | 2020-02-04 17:14:57 |
| a2019form8-kearningsre_htm.xml | 4488 | 2020-02-04 17:14:57 |
| FilingSummary.xml | 1757 | 2020-02-04 17:14:57 |
| Financial_Report.xlsx | 5817 | 2020-02-04 17:14:57 |
| mdu-20200204.xsd | 4562 | 2020-02-04 17:14:57 |
| mdu-20200204_cal.xml | 609 | 2020-02-04 17:14:57 |
| mdu-20200204_def.xml | 14527 | 2020-02-04 17:14:57 |
| mdu-20200204_lab.xml | 31381 | 2020-02-04 17:14:57 |
| mdu-20200204_pre.xml | 16430 | 2020-02-04 17:14:57 |
 mdurirpressreleasebasa16.jpg | 748436 | 2020-02-04 17:14:57 |
| MetaLinks.json | 21323 | 2020-02-04 17:14:57 |
| R1.htm | 40402 | 2020-02-04 17:14:57 |
| report.css | 2767 | 2020-02-04 17:14:57 |
| Show.js | 1085 | 2020-02-04 17:14:57 |