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v3.21.1

Note 2 - Summary of Significant Accounting Policies - Intangible Assets (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020
Minimum [Member] |  |
Finite-lived intangible assets, useful life (Year) |  | 2 years
Maximum [Member] |  |
Finite-lived intangible assets, useful life (Year) |  | 50 years
Customer Relationships [Member] |  |
Finite-lived intangible assets, useful life (Year) | 10 years |
Customer Relationships [Member] | Minimum [Member] |  |
Finite-lived intangible assets, useful life (Year) |  | 3 years
Customer Relationships [Member] | Maximum [Member] |  |
Finite-lived intangible assets, useful life (Year) |  | 10 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] | Minimum [Member] |  |
Finite-lived intangible assets, useful life (Year) |  | 2 years
Noncompetition and Nonsolicitation Agreements [Member] | Maximum [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) |  | 2 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

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: | duration

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

X
- 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=bomn_PermitsLicensesAndLeaseAcquisitionCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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