Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001145549-25-038372-index-headers.html | 2025-06-03 13:28:41 | |
| 0001145549-25-038372-index.html | 2025-06-03 13:28:41 | |
| 0001145549-25-038372.txt | 2025-06-03 13:28:41 | |
 0001145549-25-038372-xbrl.zip | 507914 | 2025-06-03 13:28:41 |
| 302_Certification.htm | 29098 | 2025-06-03 13:28:41 |
| 8dd9a11393b108d.htm | 1129363 | 2025-06-03 13:28:41 |
| 8dd9a11393b108d_htm.xml | 99965 | 2025-06-03 13:28:41 |
| 906_Certification.htm | 8516 | 2025-06-03 13:28:41 |
 chartimages_3612042.jpg | 144038 | 2025-06-03 13:28:41 |
 chartimages_3612043.jpg | 23765 | 2025-06-03 13:28:41 |
 chartimages_3612051.jpg | 59586 | 2025-06-03 13:28:41 |
| cik0000773757-20250331.xsd | 6878 | 2025-06-03 13:28:41 |
| cik0000773757-20250331_def.xml | 9507 | 2025-06-03 13:28:41 |
| cik0000773757-20250331_lab.xml | 13341 | 2025-06-03 13:28:41 |
| cik0000773757-20250331_pre.xml | 16461 | 2025-06-03 13:28:41 |
| Code_of_Ethics.htm | 67683 | 2025-06-03 13:28:41 |
| FilingSummary.xml | 4345 | 2025-06-03 13:28:41 |
 g3s93dt8uudlfrz02mk1h.jpg | 49493 | 2025-06-03 13:28:41 |
 g754u8teds4yusg3hhfwk.jpg | 49493 | 2025-06-03 13:28:41 |
 gari9dwe0ram6do6kpnol.jpg | 49493 | 2025-06-03 13:28:41 |
 ge0qn7t7l35t1kd5tihzy.jpg | 729 | 2025-06-03 13:28:41 |
 geu1permbvjk7ogtnzq41.jpg | 49493 | 2025-06-03 13:28:41 |
 gnk6dp7edn4x5m7dyofvj.jpg | 49493 | 2025-06-03 13:28:41 |
 gpk2279oeydlatj13xt7b.jpg | 49493 | 2025-06-03 13:28:41 |
 gt5uedm6v4v0r2zooih17.jpg | 49493 | 2025-06-03 13:28:41 |
 images_1916.jpg | 24911 | 2025-06-03 13:28:41 |
 images_1920.jpg | 109128 | 2025-06-03 13:28:41 |
 img9a1bac5b2.jpg | 38453 | 2025-06-03 13:28:41 |
 imgb1df8c521.jpg | 250062 | 2025-06-03 13:28:41 |
| MetaLinks.json | 96073 | 2025-06-03 13:28:41 |
| R1.htm | 12721 | 2025-06-03 13:28:41 |
| R2.htm | 96305 | 2025-06-03 13:28:41 |
| R3.htm | 16810 | 2025-06-03 13:28:41 |
| R4.htm | 14560 | 2025-06-03 13:28:41 |
| R5.htm | 41256 | 2025-06-03 13:28:41 |
| report.css | 2767 | 2025-06-03 13:28:41 |
| Show.js | 1085 | 2025-06-03 13:28:41 |