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| 0000067716-13-000101-index.html | 2013-08-07 12:15:26 | |
| 0000067716-13-000101.txt | 2013-08-07 12:15:26 | |
 0000067716-13-000101-xbrl.zip | 248508 | 2013-08-07 12:15:26 |
| exhibit10a.htm | 38252 | 2013-08-07 12:15:26 |
| exhibit10b.htm | 32533 | 2013-08-07 12:15:26 |
| exhibit12.htm | 40014 | 2013-08-07 12:15:26 |
| exhibit31a.htm | 10450 | 2013-08-07 12:15:26 |
| exhibit31b.htm | 9598 | 2013-08-07 12:15:26 |
| exhibit32.htm | 7075 | 2013-08-07 12:15:26 |
| exhibit95.htm | 118947 | 2013-08-07 12:15:26 |
| FilingSummary.xml | 32764 | 2013-08-07 12:15:26 |
| Financial_Report.xls | 1642826 | 2013-08-07 12:15:26 |
| mdu-20130630.xml | 2094112 | 2013-08-07 12:15:26 |
| mdu-20130630.xsd | 63712 | 2013-08-07 12:15:26 |
| mdu-20130630_cal.xml | 94176 | 2013-08-07 12:15:26 |
| mdu-20130630_def.xml | 317367 | 2013-08-07 12:15:26 |
| mdu-20130630_lab.xml | 764113 | 2013-08-07 12:15:26 |
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| R9.xml | 6099 | 2013-08-07 12:15:26 |
| report.css | 2741 | 2013-08-07 12:15:26 |
| Show.js | 1410 | 2013-08-07 12:15:26 |