SEC Seal
SEC Banner
Search the Next-Generation EDGAR System
Filing Detail
Form 10-Q - Quarterly report [Sections 13 or 15(d)]:
SEC Accession No. 0000067716-21-000026
Filing Date
2021-05-06
Accepted
2021-05-06 09:48:59
Documents
100
Period of Report
2021-03-31

Document Format Files

Seq Description Document Type Size
1 MDU RESOURCES FORM 10-Q 3-31-2021 mdu-20210331.htm   iXBRL 10-Q 2446121
2 MDU RESOURCES 401 K RETIREMENT PLAN AMENDMENT 1-1-2021 a2021ex10a.htm EX-10.A 6831
3 MDU RESOURCES CERTIFICATION OF CHIEF EXECUTIVE OFFICER a2021q1ex31a.htm EX-31.A 9311
4 MDU RESOURCES CERTIFICATION OF CHIEF FINANCIAL OFFICER a2021q1ex31b.htm EX-31.B 8924
5 MDU RESOURCES CERTIFICATION OF CEO AND CFO a2021q1ex32.htm EX-32 5445
6 MDU RESOURCES MINE SAFETY DISCLOSURES a2021q1ex95.htm EX-95 123648
  Complete submission text file 0000067716-21-000026.txt   11028775

Data Files

Seq Description Document Type Size
7 XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT mdu-20210331.xsd EX-101.SCH 55081
8 XBRL TAXONOMY EXTENSION CALCULATION LINKBASE DOCUMENT mdu-20210331_cal.xml EX-101.CAL 98484
9 XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT mdu-20210331_def.xml EX-101.DEF 418956
10 XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT mdu-20210331_lab.xml EX-101.LAB 731026
11 XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT mdu-20210331_pre.xml EX-101.PRE 504716
12 EXTRACTED XBRL INSTANCE DOCUMENT mdu-20210331_htm.xml XML 2304779
Mailing Address 1200 WEST CENTURY AVENUE BISMARCK ND 58503
Business Address 1200 WEST CENTURY AVENUE BISMARCK ND 58503 701-530-1000
MDU RESOURCES GROUP INC (Filer) CIK: 0000067716 (see all company filings)

IRS No.: 301133956 | Fiscal Year End: 1231
Type: 10-Q | Act: 34 | File No.: 001-03480 | Film No.: 21896204
SIC: 1400 Mining & Quarrying of Nonmetallic Minerals (No Fuels)