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Note 2 - Summary of Significant Accounting Policies - Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2018
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] | Minimum [Member]
Finite-lived intangible assets, useful life (Year)	2 years
Customer Relationships [Member] | Maximum [Member]
Finite-lived intangible assets, useful life (Year)	3 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)	3 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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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

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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

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: