Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000067716-16-000148-index-headers.html | 2016-05-06 09:23:25 | |
| 0000067716-16-000148-index.html | 2016-05-06 09:23:25 | |
| 0000067716-16-000148.txt | 2016-05-06 09:23:25 | |
 0000067716-16-000148-xbrl.zip | 258419 | 2016-05-06 09:23:25 |
| a2016q1ex10a.htm | 332883 | 2016-05-06 09:23:25 |
| a2016q1ex10b.htm | 94689 | 2016-05-06 09:23:25 |
| a2016q1ex10c.htm | 24559 | 2016-05-06 09:23:25 |
| a2016q1ex10d.htm | 10804 | 2016-05-06 09:23:25 |
| a2016q1ex10e.htm | 30933 | 2016-05-06 09:23:25 |
| a2016q1ex12.htm | 36701 | 2016-05-06 09:23:25 |
| a2016q1ex31a.htm | 9814 | 2016-05-06 09:23:25 |
| a2016q1ex31b.htm | 9237 | 2016-05-06 09:23:25 |
| a2016q1ex32.htm | 6450 | 2016-05-06 09:23:25 |
| a2016q1ex95.htm | 91183 | 2016-05-06 09:23:25 |
| a2016q1form10-q.htm | 1414902 | 2016-05-06 09:23:25 |
| FilingSummary.xml | 36444 | 2016-05-06 09:23:25 |
| Financial_Report.xlsx | 88122 | 2016-05-06 09:23:25 |
| mdu-20160331.xml | 2105156 | 2016-05-06 09:23:25 |
| mdu-20160331.xsd | 59005 | 2016-05-06 09:23:25 |
| mdu-20160331_cal.xml | 122627 | 2016-05-06 09:23:25 |
| mdu-20160331_def.xml | 368283 | 2016-05-06 09:23:25 |
| mdu-20160331_lab.xml | 841395 | 2016-05-06 09:23:25 |
| mdu-20160331_pre.xml | 457636 | 2016-05-06 09:23:25 |
| R1.htm | 20518 | 2016-05-06 09:23:25 |
| R10.htm | 7870 | 2016-05-06 09:23:25 |
| R11.htm | 27482 | 2016-05-06 09:23:25 |
| R12.htm | 15578 | 2016-05-06 09:23:25 |
| R13.htm | 18720 | 2016-05-06 09:23:25 |
| R14.htm | 17463 | 2016-05-06 09:23:25 |
| R15.htm | 90250 | 2016-05-06 09:23:25 |
| R16.htm | 89836 | 2016-05-06 09:23:25 |
| R17.htm | 91936 | 2016-05-06 09:23:25 |
| R18.htm | 45882 | 2016-05-06 09:23:25 |
| R19.htm | 152517 | 2016-05-06 09:23:25 |
| R2.htm | 84784 | 2016-05-06 09:23:25 |
| R20.htm | 53520 | 2016-05-06 09:23:25 |
| R21.htm | 80597 | 2016-05-06 09:23:25 |
| R22.htm | 39266 | 2016-05-06 09:23:25 |
| R23.htm | 18534 | 2016-05-06 09:23:25 |
| R24.htm | 89198 | 2016-05-06 09:23:25 |
| R25.htm | 25984 | 2016-05-06 09:23:25 |
| R26.htm | 13787 | 2016-05-06 09:23:25 |
| R27.htm | 17398 | 2016-05-06 09:23:25 |
| R28.htm | 89407 | 2016-05-06 09:23:25 |
| R29.htm | 83257 | 2016-05-06 09:23:25 |
| R3.htm | 43640 | 2016-05-06 09:23:25 |
| R30.htm | 88217 | 2016-05-06 09:23:25 |
| R31.htm | 39779 | 2016-05-06 09:23:25 |
| R32.htm | 148807 | 2016-05-06 09:23:25 |
| R33.htm | 49041 | 2016-05-06 09:23:25 |
| R34.htm | 72533 | 2016-05-06 09:23:25 |
| R35.htm | 33441 | 2016-05-06 09:23:25 |
| R36.htm | 52794 | 2016-05-06 09:23:25 |
| R37.htm | 7117 | 2016-05-06 09:23:25 |
| R38.htm | 23203 | 2016-05-06 09:23:25 |
| R39.htm | 12578 | 2016-05-06 09:23:25 |
| R4.htm | 16453 | 2016-05-06 09:23:25 |
| R40.htm | 11119 | 2016-05-06 09:23:25 |
| R41.htm | 11922 | 2016-05-06 09:23:25 |
| R42.htm | 31618 | 2016-05-06 09:23:25 |
| R43.htm | 36614 | 2016-05-06 09:23:25 |
| R44.htm | 81696 | 2016-05-06 09:23:25 |
| R45.htm | 26303 | 2016-05-06 09:23:25 |
| R46.htm | 29307 | 2016-05-06 09:23:25 |
| R47.htm | 23337 | 2016-05-06 09:23:25 |
| R48.htm | 35631 | 2016-05-06 09:23:25 |
| R49.htm | 14715 | 2016-05-06 09:23:25 |
| R5.htm | 121227 | 2016-05-06 09:23:25 |
| R50.htm | 13741 | 2016-05-06 09:23:25 |
| R51.htm | 12618 | 2016-05-06 09:23:25 |
| R52.htm | 16463 | 2016-05-06 09:23:25 |
| R53.htm | 24115 | 2016-05-06 09:23:25 |
| R54.htm | 73758 | 2016-05-06 09:23:25 |
| R55.htm | 10938 | 2016-05-06 09:23:25 |
| R56.htm | 50470 | 2016-05-06 09:23:25 |
| R57.htm | 43954 | 2016-05-06 09:23:25 |
| R58.htm | 32164 | 2016-05-06 09:23:25 |
| R59.htm | 11025 | 2016-05-06 09:23:25 |
| R6.htm | 11170 | 2016-05-06 09:23:25 |
| R60.htm | 65169 | 2016-05-06 09:23:25 |
| R61.htm | 14871 | 2016-05-06 09:23:25 |
| R62.htm | 23848 | 2016-05-06 09:23:25 |
| R63.htm | 22391 | 2016-05-06 09:23:25 |
| R64.htm | 77688 | 2016-05-06 09:23:25 |
| R7.htm | 88090 | 2016-05-06 09:23:25 |
| R8.htm | 9276 | 2016-05-06 09:23:25 |
| R9.htm | 5759 | 2016-05-06 09:23:25 |
| report.css | 2767 | 2016-05-06 09:23:25 |
| Show.js | 1410 | 2016-05-06 09:23:25 |