XML 33 R20.htm IDEA: XBRL DOCUMENT v3.19.1

Note 14 - Custodial Risk	3 Months Ended
	Mar. 31, 2019
Notes to Financial Statements
Custodial Risk Disclosure [Text Block]	NOTE 14.       CUSTODIAL RISK As of March 31, 2019, we had approximately $6,325,000 in excess of federally insured limits on deposit with financial institutions.

X

- Definition

A complete disclosure of custodial risk.

+ References

No definition available.

+ Details

Name:	bomn_CustodialRiskDisclosureTextBlock
Namespace Prefix:	bomn_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DisclosureTextBlockAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration