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| 0000072909-25-000007-index.html | 2025-04-24 13:10:40 | |
| 0000072909-25-000007.txt | 2025-04-24 13:10:40 | |
 0000072909-25-000007-xbrl.zip | 147078 | 2025-04-24 13:10:40 |
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| nspw-20250331.htm | 657580 | 2025-04-24 13:10:40 |
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| nspwex3201q12025.htm | 8859 | 2025-04-24 13:10:40 |
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| R8.htm | 14626 | 2025-04-24 13:10:40 |
| R9.htm | 28920 | 2025-04-24 13:10:40 |
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