Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-21-005899-index-headers.html | 2021-03-12 15:30:02 | |
| 0001437749-21-005899-index.html | 2021-03-12 15:30:02 | |
| 0001437749-21-005899.txt | 2021-03-12 15:30:02 | |
 0001437749-21-005899-xbrl.zip | 302974 | 2021-03-12 15:30:02 |
| belfa-20201231.xsd | 91629 | 2021-03-12 15:30:02 |
| belfa-20201231_cal.xml | 89116 | 2021-03-12 15:30:02 |
| belfa-20201231_def.xml | 713325 | 2021-03-12 15:30:02 |
| belfa-20201231_lab.xml | 588098 | 2021-03-12 15:30:02 |
| belfa-20201231_pre.xml | 757826 | 2021-03-12 15:30:02 |
| belfb20201231_10k.htm | 2029592 | 2021-03-12 15:30:02 |
| belfb20201231_10k_htm.xml | 2053539 | 2021-03-12 15:30:02 |
| ex_216558.htm | 46332 | 2021-03-12 15:30:02 |
| ex_216559.htm | 18544 | 2021-03-12 15:30:02 |
| ex_216560.htm | 2904 | 2021-03-12 15:30:02 |
| ex_216561.htm | 13074 | 2021-03-12 15:30:02 |
| ex_216562.htm | 13325 | 2021-03-12 15:30:02 |
| ex_216563.htm | 5395 | 2021-03-12 15:30:02 |
| ex_216564.htm | 5802 | 2021-03-12 15:30:02 |
| FilingSummary.xml | 61582 | 2021-03-12 15:30:02 |
| Financial_Report.xlsx | 116282 | 2021-03-12 15:30:02 |
| MetaLinks.json | 988415 | 2021-03-12 15:30:02 |
| R1.htm | 64138 | 2021-03-12 15:30:02 |
| R10.htm | 85102 | 2021-03-12 15:30:02 |
| R11.htm | 35899 | 2021-03-12 15:30:02 |
| R12.htm | 96615 | 2021-03-12 15:30:02 |
| R13.htm | 85279 | 2021-03-12 15:30:02 |
| R14.htm | 16135 | 2021-03-12 15:30:02 |
| R15.htm | 9049 | 2021-03-12 15:30:02 |
| R16.htm | 13147 | 2021-03-12 15:30:02 |
| R17.htm | 18448 | 2021-03-12 15:30:02 |
| R18.htm | 102581 | 2021-03-12 15:30:02 |
| R19.htm | 22373 | 2021-03-12 15:30:02 |
| R2.htm | 103729 | 2021-03-12 15:30:02 |
| R20.htm | 15932 | 2021-03-12 15:30:02 |
| R21.htm | 92048 | 2021-03-12 15:30:02 |
| R22.htm | 72035 | 2021-03-12 15:30:02 |
| R23.htm | 25747 | 2021-03-12 15:30:02 |
| R24.htm | 9190 | 2021-03-12 15:30:02 |
| R25.htm | 55306 | 2021-03-12 15:30:02 |
| R26.htm | 11231 | 2021-03-12 15:30:02 |
| R27.htm | 58036 | 2021-03-12 15:30:02 |
| R28.htm | 8262 | 2021-03-12 15:30:02 |
| R29.htm | 128932 | 2021-03-12 15:30:02 |
| R3.htm | 22134 | 2021-03-12 15:30:02 |
| R30.htm | 36141 | 2021-03-12 15:30:02 |
| R31.htm | 30388 | 2021-03-12 15:30:02 |
| R32.htm | 75982 | 2021-03-12 15:30:02 |
| R33.htm | 71274 | 2021-03-12 15:30:02 |
| R34.htm | 13066 | 2021-03-12 15:30:02 |
| R35.htm | 16450 | 2021-03-12 15:30:02 |
| R36.htm | 98322 | 2021-03-12 15:30:02 |
| R37.htm | 8751 | 2021-03-12 15:30:02 |
| R38.htm | 14182 | 2021-03-12 15:30:02 |
| R39.htm | 88081 | 2021-03-12 15:30:02 |
| R4.htm | 60989 | 2021-03-12 15:30:02 |
| R40.htm | 64254 | 2021-03-12 15:30:02 |
| R41.htm | 20011 | 2021-03-12 15:30:02 |
| R42.htm | 56829 | 2021-03-12 15:30:02 |
| R43.htm | 56781 | 2021-03-12 15:30:02 |
| R44.htm | 47812 | 2021-03-12 15:30:02 |
| R45.htm | 22991 | 2021-03-12 15:30:02 |
| R46.htm | 35639 | 2021-03-12 15:30:02 |
| R47.htm | 32970 | 2021-03-12 15:30:02 |
| R48.htm | 11313 | 2021-03-12 15:30:02 |
| R49.htm | 2875 | 2021-03-12 15:30:02 |
| R5.htm | 25621 | 2021-03-12 15:30:02 |
| R50.htm | 8708 | 2021-03-12 15:30:02 |
| R51.htm | 30304 | 2021-03-12 15:30:02 |
| R52.htm | 14283 | 2021-03-12 15:30:02 |
| R53.htm | 23766 | 2021-03-12 15:30:02 |
| R54.htm | 22135 | 2021-03-12 15:30:02 |
| R55.htm | 8811 | 2021-03-12 15:30:02 |
| R56.htm | 23075 | 2021-03-12 15:30:02 |
| R57.htm | 11871 | 2021-03-12 15:30:02 |
| R58.htm | 27089 | 2021-03-12 15:30:02 |
| R59.htm | 17127 | 2021-03-12 15:30:02 |
| R6.htm | 9161 | 2021-03-12 15:30:02 |
| R60.htm | 10411 | 2021-03-12 15:30:02 |
| R61.htm | 3318 | 2021-03-12 15:30:02 |
| R62.htm | 15734 | 2021-03-12 15:30:02 |
| R63.htm | 40049 | 2021-03-12 15:30:02 |
| R64.htm | 11747 | 2021-03-12 15:30:02 |
| R65.htm | 26412 | 2021-03-12 15:30:02 |
| R66.htm | 48586 | 2021-03-12 15:30:02 |
| R67.htm | 34512 | 2021-03-12 15:30:02 |
| R68.htm | 58702 | 2021-03-12 15:30:02 |
| R69.htm | 12521 | 2021-03-12 15:30:02 |
| R7.htm | 63836 | 2021-03-12 15:30:02 |
| R70.htm | 15436 | 2021-03-12 15:30:02 |
| R71.htm | 24815 | 2021-03-12 15:30:02 |
| R72.htm | 33879 | 2021-03-12 15:30:02 |
| R73.htm | 22284 | 2021-03-12 15:30:02 |
| R74.htm | 12340 | 2021-03-12 15:30:02 |
| R75.htm | 46939 | 2021-03-12 15:30:02 |
| R76.htm | 14370 | 2021-03-12 15:30:02 |
| R77.htm | 30319 | 2021-03-12 15:30:02 |
| R78.htm | 13863 | 2021-03-12 15:30:02 |
| R79.htm | 9782 | 2021-03-12 15:30:02 |
| R8.htm | 11377 | 2021-03-12 15:30:02 |
| R80.htm | 10841 | 2021-03-12 15:30:02 |
| R81.htm | 25582 | 2021-03-12 15:30:02 |
| R82.htm | 23879 | 2021-03-12 15:30:02 |
| R83.htm | 12512 | 2021-03-12 15:30:02 |
| R84.htm | 5397 | 2021-03-12 15:30:02 |
| R85.htm | 25607 | 2021-03-12 15:30:02 |
| R86.htm | 12039 | 2021-03-12 15:30:02 |
| R87.htm | 25055 | 2021-03-12 15:30:02 |
| R88.htm | 39945 | 2021-03-12 15:30:02 |
| R89.htm | 10737 | 2021-03-12 15:30:02 |
| R9.htm | 107790 | 2021-03-12 15:30:02 |
| R90.htm | 14055 | 2021-03-12 15:30:02 |
| R91.htm | 5090 | 2021-03-12 15:30:02 |
| R92.htm | 30488 | 2021-03-12 15:30:02 |
| R93.htm | 15145 | 2021-03-12 15:30:02 |
| report.css | 2768 | 2021-03-12 15:30:02 |
| Show.js | 1086 | 2021-03-12 15:30:02 |