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| 0000072909-21-000017-index.html | 2021-10-28 15:28:29 | |
| 0000072909-21-000017.txt | 2021-10-28 15:28:29 | |
 0000072909-21-000017-xbrl.zip | 204735 | 2021-10-28 15:28:29 |
| FilingSummary.xml | 25901 | 2021-10-28 15:28:29 |
| Financial_Report.xlsx | 59883 | 2021-10-28 15:28:29 |
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| nspw-20210930.htm | 1191621 | 2021-10-28 15:28:29 |
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| R9.htm | 28421 | 2021-10-28 15:28:29 |
| report.css | 2767 | 2021-10-28 15:28:29 |
| Show.js | 1085 | 2021-10-28 15:28:29 |