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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 ($)
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Share Repurchase Program, Authorized, Amount | $ 20
Share Repurchase Program, Authorized, Percentage of Outstanding Shares | 25.00%

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- 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

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- 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

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

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

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