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Note 16 - Subsequent Events (Details Textual)	1 Months Ended
	Aug. 06, 2020 USD ($)
Non-voting Preferred Units of DFH LLC [Member] | Subsequent Event [Member]
Redemption of Preferred Units	$ 6,000,000

X

- Definition

The value of preferred units redeemed.

+ References

No definition available.

+ Details

Name:	bomn_RedemptionOfPreferredUnits
Namespace Prefix:	bomn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_InvestmentTypeAxis=bomn_NonvotingPreferredUnitsOfDFHLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: