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Note 18 - Subsequent Events (Details Textual) - Share Repurchase Program [Member] - Common Class A [Member] - Subsequent Event [Member] $ in Millions	Jul. 23, 2024 USD ($)
Share Repurchase Program, Authorized, Amount	$ 20
Share Repurchase Program, Authorized, Percentage of Outstanding Shares	25.00%

X

- Definition

Shares authorized to be repurchased as a percentage of the average daily volume of outstanding shares.

+ References

No definition available.

+ Details

Name:	boc_ShareRepurchaseProgramAuthorizedperrcentageOfOutstandingShares
Namespace Prefix:	boc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

+ Details

Name:	srt_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_ShareRepurchaseProgramAxis=boc_ShareRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: