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Note 16 - Reserves for Losses and Loss Adjustment Expenses (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense, Favorable Development, Prior Years | $ 367,411 | $ 150,131

X
- Definition Amount of favorable development to incurred claims and claim adjustment expenses attributable to insured events of prior years. + References No definition available. + Details
Name: | boc_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseFavorableDevelopmentPriorYears
Namespace Prefix: | boc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration