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Note 27 - Capital and Reserves - Variation of Share Capital (Details) - Reconciliation Of Number Of Shares Member - shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Jan. 01, 2017
Quantity of Issue Shares LineItems |  |  |
Quantity of Shares in Issue | 612,659,638 | 612,659,638 | 536,877,850
Number of Issuance of Shares | 75,781,788 |  |

X
- Definition The number of new ordinary shares issued by the entity. + References No definition available. + Details
Name: | bfr_Numberofissuanceofshares
Namespace Prefix: | bfr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The quantity of shares in issue by the entity. + References No definition available. + Details
Name: | bfr_Quantityofissuesharesissued
Namespace Prefix: | bfr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | bfr_ReconciliationofnumberofsharesaxisAxis=bfr_ReconciliationofnumberofsharesmemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |