Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-20-019607-index-headers.html | 2020-09-11 11:51:47 | |
| 0001437749-20-019607-index.html | 2020-09-11 11:51:47 | |
| 0001437749-20-019607.txt | 2020-09-11 11:51:47 | |
 0001437749-20-019607-xbrl.zip | 69419 | 2020-09-11 11:51:47 |
| buks-20200731.xml | 316576 | 2020-09-11 11:51:47 |
| buks-20200731.xsd | 32085 | 2020-09-11 11:51:47 |
| buks-20200731_cal.xml | 44459 | 2020-09-11 11:51:47 |
| buks-20200731_def.xml | 212680 | 2020-09-11 11:51:47 |
| buks-20200731_lab.xml | 206838 | 2020-09-11 11:51:47 |
| buks-20200731_pre.xml | 233872 | 2020-09-11 11:51:47 |
| buks20200731_10q.htm | 699849 | 2020-09-11 11:51:47 |
| ex_196470.htm | 14140 | 2020-09-11 11:51:47 |
| ex_196471.htm | 14141 | 2020-09-11 11:51:47 |
| ex_196472.htm | 6714 | 2020-09-11 11:51:47 |
| ex_196473.htm | 6690 | 2020-09-11 11:51:47 |
| FilingSummary.xml | 21354 | 2020-09-11 11:51:47 |
| Financial_Report.xlsx | 39961 | 2020-09-11 11:51:47 |
| R1.htm | 32791 | 2020-09-11 11:51:47 |
| R10.htm | 5183 | 2020-09-11 11:51:47 |
| R11.htm | 6114 | 2020-09-11 11:51:47 |
| R12.htm | 6115 | 2020-09-11 11:51:47 |
| R13.htm | 12997 | 2020-09-11 11:51:47 |
| R14.htm | 6217 | 2020-09-11 11:51:47 |
| R15.htm | 7967 | 2020-09-11 11:51:47 |
| R16.htm | 43344 | 2020-09-11 11:51:47 |
| R17.htm | 19886 | 2020-09-11 11:51:47 |
| R18.htm | 10244 | 2020-09-11 11:51:47 |
| R19.htm | 5760 | 2020-09-11 11:51:47 |
| R2.htm | 141052 | 2020-09-11 11:51:47 |
| R20.htm | 39595 | 2020-09-11 11:51:47 |
| R21.htm | 19071 | 2020-09-11 11:51:47 |
| R22.htm | 3318 | 2020-09-11 11:51:47 |
| R23.htm | 5310 | 2020-09-11 11:51:47 |
| R24.htm | 3979 | 2020-09-11 11:51:47 |
| R25.htm | 29537 | 2020-09-11 11:51:47 |
| R26.htm | 10964 | 2020-09-11 11:51:47 |
| R27.htm | 20408 | 2020-09-11 11:51:47 |
| R28.htm | 3080 | 2020-09-11 11:51:47 |
| R29.htm | 16593 | 2020-09-11 11:51:47 |
| R3.htm | 38133 | 2020-09-11 11:51:47 |
| R30.htm | 9269 | 2020-09-11 11:51:47 |
| R31.htm | 7155 | 2020-09-11 11:51:47 |
| R32.htm | 23933 | 2020-09-11 11:51:47 |
| R33.htm | 5151 | 2020-09-11 11:51:47 |
| R4.htm | 82349 | 2020-09-11 11:51:47 |
| R5.htm | 33680 | 2020-09-11 11:51:47 |
| R6.htm | 77185 | 2020-09-11 11:51:47 |
| R7.htm | 7086 | 2020-09-11 11:51:47 |
| R8.htm | 6233 | 2020-09-11 11:51:47 |
| R9.htm | 22736 | 2020-09-11 11:51:47 |
| report.css | 2767 | 2020-09-11 11:51:47 |
| Show.js | 1085 | 2020-09-11 11:51:47 |