Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001466593-21-000003-index-headers.html | 2021-02-16 09:23:35 | |
| 0001466593-21-000003-index.html | 2021-02-16 09:23:35 | |
| 0001466593-21-000003.txt | 2021-02-16 09:23:35 | |
 0001466593-21-000003-xbrl.zip | 41909 | 2021-02-16 09:23:35 |
| FilingSummary.xml | 1726 | 2021-02-16 09:23:35 |
| Financial_Report.xlsx | 5462 | 2021-02-16 09:23:35 |
 image41a.jpg | 6170 | 2021-02-16 09:23:35 |
| MetaLinks.json | 29357 | 2021-02-16 09:23:35 |
| ottr-20210215.htm | 31149 | 2021-02-16 09:23:35 |
| ottr-20210215.xsd | 2426 | 2021-02-16 09:23:35 |
| ottr-20210215_cal.xml | 712 | 2021-02-16 09:23:35 |
| ottr-20210215_def.xml | 1645 | 2021-02-16 09:23:35 |
| ottr-20210215_htm.xml | 13492 | 2021-02-16 09:23:35 |
| ottr-20210215_lab.xml | 41182 | 2021-02-16 09:23:35 |
| ottr-20210215_pre.xml | 21884 | 2021-02-16 09:23:35 |
| q42020earningsreleaseex991.htm | 432803 | 2021-02-16 09:23:35 |
| R1.htm | 38638 | 2021-02-16 09:23:35 |
| report.css | 2767 | 2021-02-16 09:23:35 |
| Show.js | 1085 | 2021-02-16 09:23:35 |