Represents the amount held back and disbursed in a business combination.

No definition available.

Name:	bomn_BusinessCombinationAmountHeldBackAndDisbursed
Namespace Prefix:	bomn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the amount held back as required consent holdback in a business combination.

+ References

No definition available.

+ Details

Name:	bomn_BusinessCombinationAmountHeldBackAsRequiredConsentHoldback
Namespace Prefix:	bomn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Cash outflow for short-term payables for a business acquisition.

+ References

No definition available.

+ Details

Name:	bomn_PaymentsOnShorttermPayablesForBusinessAcquisitions
Namespace Prefix:	bomn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

- Definition

Amount of noncurrent assets that are pledged or subject to withdrawal restrictions, classified as other.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherRestrictedAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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

- Definition

Number of shares of stock issued during the period pursuant to acquisitions.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

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

Name:	us-gaap_BusinessAcquisitionAxis=bomn_TammyLynnOutdoorLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

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Name:	us-gaap_BusinessAcquisitionAxis=bomn_KeyOutdoorIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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Note 6 - Business Acquisitions (Details Textual) - USD ($)				6 Months Ended
	Aug. 31, 2018	Aug. 22, 2018	Jul. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Payments to Acquire Businesses, Net of Cash Acquired, Total				$ 0	$ 0
Minimum [Member]
Property, Plant and Equipment, Useful Life				2 years
Finite-Lived Intangible Asset, Useful Life				2 years
Maximum [Member]
Property, Plant and Equipment, Useful Life				15 years
Finite-Lived Intangible Asset, Useful Life				50 years
Tammy Lynn Outdoor, LLC [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 14,763,261
Tammy Lynn Outdoor, LLC [Member] \| Common Class A [Member]
Stock Issued During Period, Shares, Acquisitions			85,170
Key Outdoor, Inc [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total		$ 38,000,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred		233,894
Business Combination, Amount Held Back and Disbursed		1,900,000
Business Combination, Amount Held Back as Required Consent Holdback		329,467
Payments to Acquire Businesses, Gross		$ 36,004,427
Payments on Short-term Payables for Business Acquisitions				$ 1,064,990
Waitt Outdoor, LLC [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total	$ 82,000,000					$ 84,031,262
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	2,031,262
Payments to Acquire Businesses, Gross	84,031,262
Other Restricted Assets, Noncurrent	$ 4,102,500