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v3.25.1

Note 9 - Accrued Expenses (Details Textual) $ in Millions | 3 Months Ended
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Mar. 31, 2025 USD ($)
Restrucruting Costs, Reversal | $ 3.2

X
- Definition The amount of restructuring costs reversed during the period. + References No definition available. + Details
Name: | belfa_RestrucrutingCostsReversal
Namespace Prefix: | belfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration