XML 46 R31.htm IDEA: XBRL DOCUMENT
v3.8.0.1

DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] |
Schedule of earnings and weighted average shares outstanding used in the computation of basic and diluted earnings (loss) per share | The earnings and weighted average shares outstanding used in the computation of basic and diluted earnings per share are as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |
Net (loss) earnings |  | $ | (11,897 | ) |  | $ | (64,834 | ) |  | $ | 19,197 |
Less dividends declared: |  |  |  |  |  |  |  |  |  |  |  |
Class A |  |  | 522 |  |  |  | 522 |  |  |  | 522 |
Class B |  |  | 2,757 |  |  |  | 2,728 |  |  |  | 2,713 |
Undistributed (loss) earnings |  | $ | (15,176 | ) |  | $ | (68,084 | ) |  | $ | 15,962 |
Undistributed (loss) earnings allocation - basic and diluted: |  |  |  |  |  |  |  |  |
Class A undistributed (loss) earnings |  | $ | (2,635 | ) |  | $ | (11,930 | ) |  | $ | 2,809 |
Class B undistributed (loss) earnings |  |  | (12,541 | ) |  |  | (56,154 | ) |  |  | 13,153 |
Total undistributed (loss) earnings |  | $ | (15,176 | ) |  | $ | (68,084 | ) |  | $ | 15,962 |
Net (loss) earnings allocation - basic and diluted: |  |  |  |  |  |  |  |  |  |  |  |
Class A net (loss) earnings |  | $ | (2,113 | ) |  | $ | (11,408 | ) |  | $ | 3,331 |
Class B net (loss) earnings |  |  | (9,784 | ) |  |  | (53,426 | ) |  |  | 15,866 |
Net (loss) earnings |  | $ | (11,897 | ) |  | $ | (64,834 | ) |  | $ | 19,197 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |
Class A - basic and diluted |  |  | 2,175 |  |  |  | 2,175 |  |  |  | 2,175 |
Class B - basic and diluted |  |  | 9,857 |  |  |  | 9,749 |  |  |  | 9,698 |
Net (loss) earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Class A - basic and diluted |  | $ | (0.97 | ) |  | $ | (5.25 | ) |  | $ | 1.53 |
Class B - basic and diluted |  | $ | (0.99 | ) |  | $ | (5.48 | ) |  | $ | 1.64 |

X
- References No definition available. + Details
Name: | belfb_DESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAbstract
Namespace Prefix: | belfb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration