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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Trading Securities (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Marketable equity securities, Cost	$ 81,823,525	$ 49,554,926
Marketable equity securities, Gross Unrealized Gain (Loss)	(18,028,972)	6,353,001
Marketable equity securities	$ 63,794,553	$ 55,907,927

X

- Definition

The accumulated unrealized gain (loss) on equity securities.

+ References

No definition available.

+ Details

Name:	bomn_EquitySecuritiesFvniAccumulatedUnrealizedGainLoss
Namespace Prefix:	bomn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

+ Details

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

X

- Definition

Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

+ References

No definition available.

+ Details

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