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Note 16 - Reserves for Losses and Loss Adjustment Expenses (Details Textual) - USD ($)	12 Months Ended
	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