Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000092521-21-000009-index-headers.html | 2021-07-29 14:11:43 | |
| 0000092521-21-000009-index.html | 2021-07-29 14:11:43 | |
| 0000092521-21-000009.txt | 2021-07-29 14:11:43 | |
 0000092521-21-000009-xbrl.zip | 214952 | 2021-07-29 14:11:43 |
| FilingSummary.xml | 30425 | 2021-07-29 14:11:43 |
| Financial_Report.xlsx | 64715 | 2021-07-29 14:11:43 |
| MetaLinks.json | 550107 | 2021-07-29 14:11:43 |
| R1.htm | 47286 | 2021-07-29 14:11:43 |
| R10.htm | 13133 | 2021-07-29 14:11:43 |
| R11.htm | 26439 | 2021-07-29 14:11:43 |
| R12.htm | 32051 | 2021-07-29 14:11:43 |
| R13.htm | 42790 | 2021-07-29 14:11:43 |
| R14.htm | 42226 | 2021-07-29 14:11:43 |
| R15.htm | 20517 | 2021-07-29 14:11:43 |
| R16.htm | 52334 | 2021-07-29 14:11:43 |
| R17.htm | 43763 | 2021-07-29 14:11:43 |
| R18.htm | 30696 | 2021-07-29 14:11:43 |
| R19.htm | 33099 | 2021-07-29 14:11:43 |
| R2.htm | 53058 | 2021-07-29 14:11:43 |
| R20.htm | 39782 | 2021-07-29 14:11:43 |
| R21.htm | 43359 | 2021-07-29 14:11:43 |
| R22.htm | 107261 | 2021-07-29 14:11:43 |
| R23.htm | 49291 | 2021-07-29 14:11:43 |
| R24.htm | 31776 | 2021-07-29 14:11:43 |
| R25.htm | 10038 | 2021-07-29 14:11:43 |
| R26.htm | 8438 | 2021-07-29 14:11:43 |
| R27.htm | 18177 | 2021-07-29 14:11:43 |
| R28.htm | 21453 | 2021-07-29 14:11:43 |
| R29.htm | 17405 | 2021-07-29 14:11:43 |
| R3.htm | 4814 | 2021-07-29 14:11:43 |
| R30.htm | 14530 | 2021-07-29 14:11:43 |
| R31.htm | 16881 | 2021-07-29 14:11:43 |
| R32.htm | 9482 | 2021-07-29 14:11:43 |
| R33.htm | 5003 | 2021-07-29 14:11:43 |
| R34.htm | 36416 | 2021-07-29 14:11:43 |
| R35.htm | 21757 | 2021-07-29 14:11:43 |
| R36.htm | 19287 | 2021-07-29 14:11:43 |
| R37.htm | 6756 | 2021-07-29 14:11:43 |
| R38.htm | 17940 | 2021-07-29 14:11:43 |
| R39.htm | 18800 | 2021-07-29 14:11:43 |
| R4.htm | 88986 | 2021-07-29 14:11:43 |
| R40.htm | 76889 | 2021-07-29 14:11:43 |
| R41.htm | 9584 | 2021-07-29 14:11:43 |
| R42.htm | 38330 | 2021-07-29 14:11:43 |
| R43.htm | 6829 | 2021-07-29 14:11:43 |
| R44.htm | 10554 | 2021-07-29 14:11:43 |
| R45.htm | 7311 | 2021-07-29 14:11:43 |
| R46.htm | 6586 | 2021-07-29 14:11:43 |
| R47.htm | 31407 | 2021-07-29 14:11:43 |
| R48.htm | 5794 | 2021-07-29 14:11:43 |
| R49.htm | 13724 | 2021-07-29 14:11:43 |
| R5.htm | 121060 | 2021-07-29 14:11:43 |
| R6.htm | 8496 | 2021-07-29 14:11:43 |
| R7.htm | 38450 | 2021-07-29 14:11:43 |
| R8.htm | 7852 | 2021-07-29 14:11:43 |
| R9.htm | 5090 | 2021-07-29 14:11:43 |
| report.css | 2767 | 2021-07-29 14:11:43 |
| Show.js | 1085 | 2021-07-29 14:11:43 |
| sps-20210630.htm | 1204957 | 2021-07-29 14:11:43 |
| sps-20210630.xsd | 43447 | 2021-07-29 14:11:43 |
| sps-20210630_cal.xml | 65876 | 2021-07-29 14:11:43 |
| sps-20210630_def.xml | 191058 | 2021-07-29 14:11:43 |
| sps-20210630_htm.xml | 1151743 | 2021-07-29 14:11:43 |
| sps-20210630_lab.xml | 520755 | 2021-07-29 14:11:43 |
| sps-20210630_pre.xml | 331804 | 2021-07-29 14:11:43 |
| spsex3101q22021.htm | 10709 | 2021-07-29 14:11:43 |
| spsex3102q22021.htm | 10773 | 2021-07-29 14:11:43 |
| spsex3201q22021.htm | 8869 | 2021-07-29 14:11:43 |