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Note 2 - Summary of Significant Accounting Policies - Intangible Assets (Details) | Dec. 31, 2023
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Minimum [Member] |
Finite-lived intangible assets, useful life (Year) | 5 years
Maximum [Member] |
Finite-lived intangible assets, useful life (Year) | 50 years
Customer Relationships [Member] | Minimum [Member] |
Finite-lived intangible assets, useful life (Year) | 10 years
Customer Relationships [Member] | Maximum [Member] |
Finite-lived intangible assets, useful life (Year) | 15 years
Permits, Licenses and Lease Acquisition Costs [Member] | Minimum [Member] |
Finite-lived intangible assets, useful life (Year) | 10 years
Permits, Licenses and Lease Acquisition Costs [Member] | Maximum [Member] |
Finite-lived intangible assets, useful life (Year) | 50 years
Noncompetition and Nonsolicitation Agreements [Member] |
Finite-lived intangible assets, useful life (Year) | 5 years
Technology, Trade Names and Trademarks [Member] | Minimum [Member] |
Finite-lived intangible assets, useful life (Year) | 10 years
Technology, Trade Names and Trademarks [Member] | Maximum [Member] |
Finite-lived intangible assets, useful life (Year) | 20 years
Site Location [Member] |
Finite-lived intangible assets, useful life (Year) | 15 years
Capitalized Contract Costs [Member] |
Finite-lived intangible assets, useful life (Year) | 10 years

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=boc_PermitsLicensesAndLeaseAcquisitionCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=boc_NoncompetitionAndNonsolicitationAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=boc_TechnologyTradeNamesAndTrademarksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=boc_SiteLocationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=boc_CapitalizedContractCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |