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| 0001437749-24-016579.txt | 2024-05-14 15:18:04 | |
 0001437749-24-016579-xbrl.zip | 10911 | 2024-05-14 15:18:04 |
| belfb-20240514.xsd | 3849 | 2024-05-14 15:18:04 |
| belfb-20240514_def.xml | 13376 | 2024-05-14 15:18:04 |
| belfb-20240514_lab.xml | 17526 | 2024-05-14 15:18:04 |
| belfb-20240514_pre.xml | 13353 | 2024-05-14 15:18:04 |
| belfb20240507_8k.htm | 41108 | 2024-05-14 15:18:04 |
| belfb20240507_8k_htm.xml | 4634 | 2024-05-14 15:18:04 |
| FilingSummary.xml | 2004 | 2024-05-14 15:18:04 |
| Financial_Report.xlsx | 5818 | 2024-05-14 15:18:04 |
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| R1.htm | 42329 | 2024-05-14 15:18:04 |
| report.css | 2767 | 2024-05-14 15:18:04 |
| Show.js | 1084 | 2024-05-14 15:18:04 |