Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000950170-23-002144-index-headers.html | 2023-02-08 16:11:51 | |
| 0000950170-23-002144-index.html | 2023-02-08 16:11:51 | |
| 0000950170-23-002144.txt | 2023-02-08 16:11:51 | |
 0000950170-23-002144-xbrl.zip | 523541 | 2023-02-08 16:11:51 |
| bchg-20221231.htm | 1399588 | 2023-02-08 16:11:51 |
| bchg-20221231.xsd | 26164 | 2023-02-08 16:11:51 |
| bchg-20221231_cal.xml | 12967 | 2023-02-08 16:11:51 |
| bchg-20221231_def.xml | 31574 | 2023-02-08 16:11:51 |
| bchg-20221231_htm.xml | 659528 | 2023-02-08 16:11:51 |
| bchg-20221231_lab.xml | 149870 | 2023-02-08 16:11:51 |
| bchg-20221231_pre.xml | 104606 | 2023-02-08 16:11:51 |
| bchg-ex31_1.htm | 29054 | 2023-02-08 16:11:51 |
| bchg-ex31_2.htm | 29341 | 2023-02-08 16:11:51 |
| bchg-ex32_1.htm | 8987 | 2023-02-08 16:11:51 |
| bchg-ex32_2.htm | 9005 | 2023-02-08 16:11:51 |
| FilingSummary.xml | 18542 | 2023-02-08 16:11:51 |
| Financial_Report.xlsx | 46528 | 2023-02-08 16:11:51 |
 img195552362_0.jpg | 311667 | 2023-02-08 16:11:51 |
 img195552362_1.jpg | 230986 | 2023-02-08 16:11:51 |
 img195552362_2.jpg | 217704 | 2023-02-08 16:11:51 |
| MetaLinks.json | 239308 | 2023-02-08 16:11:51 |
| R1.htm | 53286 | 2023-02-08 16:11:51 |
| R10.htm | 13274 | 2023-02-08 16:11:51 |
| R11.htm | 12905 | 2023-02-08 16:11:51 |
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| R19.htm | 55087 | 2023-02-08 16:11:51 |
| R2.htm | 43729 | 2023-02-08 16:11:51 |
| R20.htm | 100397 | 2023-02-08 16:11:51 |
| R21.htm | 4030 | 2023-02-08 16:11:51 |
| R22.htm | 11685 | 2023-02-08 16:11:51 |
| R23.htm | 5756 | 2023-02-08 16:11:51 |
| R24.htm | 24539 | 2023-02-08 16:11:51 |
| R25.htm | 3957 | 2023-02-08 16:11:51 |
| R26.htm | 4928 | 2023-02-08 16:11:51 |
| R27.htm | 36682 | 2023-02-08 16:11:51 |
| R28.htm | 21747 | 2023-02-08 16:11:51 |
| R29.htm | 8532 | 2023-02-08 16:11:51 |
| R3.htm | 4283 | 2023-02-08 16:11:51 |
| R4.htm | 13829 | 2023-02-08 16:11:51 |
| R5.htm | 20387 | 2023-02-08 16:11:51 |
| R6.htm | 34306 | 2023-02-08 16:11:51 |
| R7.htm | 14205 | 2023-02-08 16:11:51 |
| R8.htm | 73243 | 2023-02-08 16:11:51 |
| R9.htm | 60826 | 2023-02-08 16:11:51 |
| report.css | 2767 | 2023-02-08 16:11:51 |
| Show.js | 1085 | 2023-02-08 16:11:51 |