Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000067716-15-000089-index-headers.html | 2015-08-04 10:56:59 | |
| 0000067716-15-000089-index.html | 2015-08-04 10:56:59 | |
| 0000067716-15-000089.txt | 2015-08-04 10:56:59 | |
 0000067716-15-000089-xbrl.zip | 280374 | 2015-08-04 10:56:59 |
| a2015q2ex10a.htm | 20989 | 2015-08-04 10:56:59 |
| a2015q2ex10b.htm | 31475 | 2015-08-04 10:56:59 |
| a2015q2ex10c.htm | 33504 | 2015-08-04 10:56:59 |
| a2015q2ex12.htm | 36587 | 2015-08-04 10:56:59 |
| a2015q2ex31a.htm | 9790 | 2015-08-04 10:56:59 |
| a2015q2ex31b.htm | 9213 | 2015-08-04 10:56:59 |
| a2015q2ex32.htm | 6426 | 2015-08-04 10:56:59 |
| a2015q2ex95.htm | 84081 | 2015-08-04 10:56:59 |
| a2015q2form10-q.htm | 1856415 | 2015-08-04 10:56:59 |
| FilingSummary.xml | 36224 | 2015-08-04 10:56:59 |
| Financial_Report.xlsx | 94806 | 2015-08-04 10:56:59 |
| mdu-20150630.xml | 2614455 | 2015-08-04 10:56:59 |
| mdu-20150630.xsd | 63422 | 2015-08-04 10:56:59 |
| mdu-20150630_cal.xml | 122981 | 2015-08-04 10:56:59 |
| mdu-20150630_def.xml | 365393 | 2015-08-04 10:56:59 |
| mdu-20150630_lab.xml | 854124 | 2015-08-04 10:56:59 |
| mdu-20150630_pre.xml | 458051 | 2015-08-04 10:56:59 |
| R1.htm | 20670 | 2015-08-04 10:56:59 |
| R10.htm | 7634 | 2015-08-04 10:56:59 |
| R11.htm | 27379 | 2015-08-04 10:56:59 |
| R12.htm | 21658 | 2015-08-04 10:56:59 |
| R13.htm | 18421 | 2015-08-04 10:56:59 |
| R14.htm | 14848 | 2015-08-04 10:56:59 |
| R15.htm | 146284 | 2015-08-04 10:56:59 |
| R16.htm | 100092 | 2015-08-04 10:56:59 |
| R17.htm | 79522 | 2015-08-04 10:56:59 |
| R18.htm | 106476 | 2015-08-04 10:56:59 |
| R19.htm | 137861 | 2015-08-04 10:56:59 |
| R2.htm | 93865 | 2015-08-04 10:56:59 |
| R20.htm | 54374 | 2015-08-04 10:56:59 |
| R21.htm | 124822 | 2015-08-04 10:56:59 |
| R22.htm | 70240 | 2015-08-04 10:56:59 |
| R23.htm | 17060 | 2015-08-04 10:56:59 |
| R24.htm | 94653 | 2015-08-04 10:56:59 |
| R25.htm | 5784 | 2015-08-04 10:56:59 |
| R26.htm | 24316 | 2015-08-04 10:56:59 |
| R27.htm | 19510 | 2015-08-04 10:56:59 |
| R28.htm | 16852 | 2015-08-04 10:56:59 |
| R29.htm | 144657 | 2015-08-04 10:56:59 |
| R3.htm | 51520 | 2015-08-04 10:56:59 |
| R30.htm | 94200 | 2015-08-04 10:56:59 |
| R31.htm | 74288 | 2015-08-04 10:56:59 |
| R32.htm | 93158 | 2015-08-04 10:56:59 |
| R33.htm | 130733 | 2015-08-04 10:56:59 |
| R34.htm | 49285 | 2015-08-04 10:56:59 |
| R35.htm | 115537 | 2015-08-04 10:56:59 |
| R36.htm | 64810 | 2015-08-04 10:56:59 |
| R37.htm | 51941 | 2015-08-04 10:56:59 |
| R38.htm | 7214 | 2015-08-04 10:56:59 |
| R39.htm | 23759 | 2015-08-04 10:56:59 |
| R4.htm | 20353 | 2015-08-04 10:56:59 |
| R40.htm | 13980 | 2015-08-04 10:56:59 |
| R41.htm | 9426 | 2015-08-04 10:56:59 |
| R42.htm | 4862 | 2015-08-04 10:56:59 |
| R43.htm | 32720 | 2015-08-04 10:56:59 |
| R44.htm | 45451 | 2015-08-04 10:56:59 |
| R45.htm | 88560 | 2015-08-04 10:56:59 |
| R46.htm | 14202 | 2015-08-04 10:56:59 |
| R47.htm | 31698 | 2015-08-04 10:56:59 |
| R48.htm | 27456 | 2015-08-04 10:56:59 |
| R49.htm | 39293 | 2015-08-04 10:56:59 |
| R5.htm | 129539 | 2015-08-04 10:56:59 |
| R50.htm | 16277 | 2015-08-04 10:56:59 |
| R51.htm | 19645 | 2015-08-04 10:56:59 |
| R52.htm | 23819 | 2015-08-04 10:56:59 |
| R53.htm | 30169 | 2015-08-04 10:56:59 |
| R54.htm | 26785 | 2015-08-04 10:56:59 |
| R55.htm | 76114 | 2015-08-04 10:56:59 |
| R56.htm | 11548 | 2015-08-04 10:56:59 |
| R57.htm | 57735 | 2015-08-04 10:56:59 |
| R58.htm | 47740 | 2015-08-04 10:56:59 |
| R59.htm | 36128 | 2015-08-04 10:56:59 |
| R6.htm | 12379 | 2015-08-04 10:56:59 |
| R60.htm | 11157 | 2015-08-04 10:56:59 |
| R61.htm | 51717 | 2015-08-04 10:56:59 |
| R62.htm | 19349 | 2015-08-04 10:56:59 |
| R63.htm | 21322 | 2015-08-04 10:56:59 |
| R64.htm | 32655 | 2015-08-04 10:56:59 |
| R65.htm | 77337 | 2015-08-04 10:56:59 |
| R66.htm | 7857 | 2015-08-04 10:56:59 |
| R7.htm | 102471 | 2015-08-04 10:56:59 |
| R8.htm | 9358 | 2015-08-04 10:56:59 |
| R9.htm | 5908 | 2015-08-04 10:56:59 |
| report.css | 2767 | 2015-08-04 10:56:59 |
| Show.js | 1410 | 2015-08-04 10:56:59 |