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Note 12 - Capital Stock - Summary of Warrant Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Outstanding (in shares)	105,556
Outstanding, weighted average exercise price (in dollars per share)	$ 9.95
Outstanding, weighted average remaining contractual life (Year)	6 years 182 days	7 years 182 days
Outstanding, aggregate intrinsic value of vested warrants	$ 1,419,728	$ 2,368,677
Issued (in shares)
Issued, weighted average exercise price (in dollars per share)
Exercised (in shares)
Exercised, weighted average exercise price (in dollars per share)
Expired (in shares)
Outstanding (in shares)	105,556	105,556
Outstanding, weighted average exercise price (in dollars per share)	$ 9.95	$ 9.95

X

- Definition

The number of warrants or rights exercised during period.

+ References

No definition available.

+ Details

Name:	bomn_ClassOfWarrantOrRightExercisedDuringPeriod
Namespace Prefix:	bomn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share of warrants or rights exercised during period.

+ References

No definition available.

+ Details

Name:	bomn_ClassOfWarrantOrRightExercisedDuringPeriodExercisePrice
Namespace Prefix:	bomn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of warrants or rights expired during period.

+ References

No definition available.

+ Details

Name:	bomn_ClassOfWarrantOrRightExpiredDuringPeriod
Namespace Prefix:	bomn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of warrants or rights issued during period.

+ References

No definition available.

+ Details

Name:	bomn_ClassOfWarrantOrRightIssuedDuringPeriod
Namespace Prefix:	bomn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share of warrants or rights issued during period.

+ References

No definition available.

+ Details

Name:	bomn_ClassOfWarrantOrRightIssuedDuringPeriodExercisePrice
Namespace Prefix:	bomn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The remaining term of certain warrants or rights.

+ References

No definition available.

+ Details

Name:	bomn_ClassOfWarrantOrRightTerm
Namespace Prefix:	bomn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant