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Note 8 - Investments, Including Investments Accounted for Using the Equity Method - Marketable Equity Securities (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Marketable equity securities,Cost	$ 49,941,567
Marketable equity securities,Gross Unrealized Loss	2,925,116
Marketable equity securities	$ 52,866,683

X

- Definition

Amount of accumulated unrealized loss on equity securities.

+ References

No definition available.

+ Details

Name:	bomn_EquitySecuritiesFvniAccumulatedUnrealizedLoss
Namespace Prefix:	bomn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Name:	us-gaap_EquitySecuritiesFvNi
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

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