Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001628280-25-034206-index-headers.html | 2025-07-03 15:03:20 | |
| 0001628280-25-034206-index.html | 2025-07-03 15:03:20 | |
| 0001628280-25-034206.txt | 2025-07-03 15:03:20 | |
 0001628280-25-034206-xbrl.zip | 292478 | 2025-07-03 15:03:20 |
| buks-20250430.htm | 1363938 | 2025-07-03 15:03:20 |
| buks-20250430.xsd | 56810 | 2025-07-03 15:03:20 |
| buks-20250430xex231.htm | 2599 | 2025-07-03 15:03:20 |
| buks-20250430xexx19.htm | 67852 | 2025-07-03 15:03:20 |
| buks-20250430xexx21.htm | 3931 | 2025-07-03 15:03:20 |
| buks-20250430xexx3111.htm | 10054 | 2025-07-03 15:03:20 |
| buks-20250430xexx3121.htm | 9827 | 2025-07-03 15:03:20 |
| buks-20250430xexx3211.htm | 5145 | 2025-07-03 15:03:20 |
| buks-20250430xexx3221.htm | 5174 | 2025-07-03 15:03:20 |
| buks-20250430_cal.xml | 97414 | 2025-07-03 15:03:20 |
| buks-20250430_def.xml | 255883 | 2025-07-03 15:03:20 |
| buks-20250430_htm.xml | 1147521 | 2025-07-03 15:03:20 |
| buks-20250430_lab.xml | 710438 | 2025-07-03 15:03:20 |
| buks-20250430_pre.xml | 504853 | 2025-07-03 15:03:20 |
| FilingSummary.xml | 46028 | 2025-07-03 15:03:20 |
| MetaLinks.json | 1087787 | 2025-07-03 15:03:20 |
| R1.htm | 61470 | 2025-07-03 15:03:20 |
| R10.htm | 14767 | 2025-07-03 15:03:20 |
| R11.htm | 11537 | 2025-07-03 15:03:20 |
| R12.htm | 17989 | 2025-07-03 15:03:20 |
| R13.htm | 41702 | 2025-07-03 15:03:20 |
| R14.htm | 29546 | 2025-07-03 15:03:20 |
| R15.htm | 22162 | 2025-07-03 15:03:20 |
| R16.htm | 11277 | 2025-07-03 15:03:20 |
| R17.htm | 44415 | 2025-07-03 15:03:20 |
| R18.htm | 19203 | 2025-07-03 15:03:20 |
| R19.htm | 34469 | 2025-07-03 15:03:20 |
| R2.htm | 7762 | 2025-07-03 15:03:20 |
| R20.htm | 6607 | 2025-07-03 15:03:20 |
| R21.htm | 11852 | 2025-07-03 15:03:20 |
| R22.htm | 8684 | 2025-07-03 15:03:20 |
| R23.htm | 52644 | 2025-07-03 15:03:20 |
| R24.htm | 5857 | 2025-07-03 15:03:20 |
| R25.htm | 17777 | 2025-07-03 15:03:20 |
| R26.htm | 8465 | 2025-07-03 15:03:20 |
| R27.htm | 4371 | 2025-07-03 15:03:20 |
| R28.htm | 39012 | 2025-07-03 15:03:20 |
| R29.htm | 150293 | 2025-07-03 15:03:20 |
| R3.htm | 136531 | 2025-07-03 15:03:20 |
| R30.htm | 39674 | 2025-07-03 15:03:20 |
| R31.htm | 76208 | 2025-07-03 15:03:20 |
| R32.htm | 9903 | 2025-07-03 15:03:20 |
| R33.htm | 12501 | 2025-07-03 15:03:20 |
| R34.htm | 17110 | 2025-07-03 15:03:20 |
| R35.htm | 36654 | 2025-07-03 15:03:20 |
| R36.htm | 32287 | 2025-07-03 15:03:20 |
| R37.htm | 15391 | 2025-07-03 15:03:20 |
| R38.htm | 14368 | 2025-07-03 15:03:20 |
| R39.htm | 41289 | 2025-07-03 15:03:20 |
| R4.htm | 43152 | 2025-07-03 15:03:20 |
| R40.htm | 15362 | 2025-07-03 15:03:20 |
| R41.htm | 33835 | 2025-07-03 15:03:20 |
| R42.htm | 43856 | 2025-07-03 15:03:20 |
| R43.htm | 62062 | 2025-07-03 15:03:20 |
| R44.htm | 14451 | 2025-07-03 15:03:20 |
| R45.htm | 27700 | 2025-07-03 15:03:20 |
| R46.htm | 43566 | 2025-07-03 15:03:20 |
| R47.htm | 68271 | 2025-07-03 15:03:20 |
| R48.htm | 10988 | 2025-07-03 15:03:20 |
| R49.htm | 17873 | 2025-07-03 15:03:20 |
| R5.htm | 95514 | 2025-07-03 15:03:20 |
| R50.htm | 4519 | 2025-07-03 15:03:20 |
| R51.htm | 11852 | 2025-07-03 15:03:20 |
| R52.htm | 30140 | 2025-07-03 15:03:20 |
| R53.htm | 43905 | 2025-07-03 15:03:20 |
| R54.htm | 36504 | 2025-07-03 15:03:20 |
| R55.htm | 24580 | 2025-07-03 15:03:20 |
| R56.htm | 6380 | 2025-07-03 15:03:20 |
| R57.htm | 8373 | 2025-07-03 15:03:20 |
| R58.htm | 26400 | 2025-07-03 15:03:20 |
| R59.htm | 13710 | 2025-07-03 15:03:20 |
| R6.htm | 49520 | 2025-07-03 15:03:20 |
| R60.htm | 25454 | 2025-07-03 15:03:20 |
| R61.htm | 43352 | 2025-07-03 15:03:20 |
| R62.htm | 10249 | 2025-07-03 15:03:20 |
| R63.htm | 32521 | 2025-07-03 15:03:20 |
| R64.htm | 30608 | 2025-07-03 15:03:20 |
| R65.htm | 30100 | 2025-07-03 15:03:20 |
| R66.htm | 13017 | 2025-07-03 15:03:20 |
| R67.htm | 59402 | 2025-07-03 15:03:20 |
| R68.htm | 20464 | 2025-07-03 15:03:20 |
| R69.htm | 11971 | 2025-07-03 15:03:20 |
| R7.htm | 103350 | 2025-07-03 15:03:20 |
| R70.htm | 27941 | 2025-07-03 15:03:20 |
| R71.htm | 71787 | 2025-07-03 15:03:20 |
| R72.htm | 13261 | 2025-07-03 15:03:20 |
| R73.htm | 26440 | 2025-07-03 15:03:20 |
| R74.htm | 33649 | 2025-07-03 15:03:20 |
| R75.htm | 11829 | 2025-07-03 15:03:20 |
| R8.htm | 83278 | 2025-07-03 15:03:20 |
| R9.htm | 75849 | 2025-07-03 15:03:20 |
| report.css | 2767 | 2025-07-03 15:03:20 |
| Show.js | 1085 | 2025-07-03 15:03:20 |