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Note 12 - Capital Stock - Summary of Warrant Activity (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Outstanding (in shares) | 105,556 | 105,556 |
Outstanding, weighted average exercise price (in dollars per share) | $ 9.95 | $ 9.95 |
Outstanding, weighted average remaining contractual life (Year) | 4 years 6 months | 5 years 6 months | 6 years 6 months
Outstanding, aggregate intrinsic value of vested warrants | $ 1,868,341 | $ 1,170,616 | $ 1,419,728
Issued (in shares) | 0 | 0 |
Exercised (in shares) | 0 | 0 |
Expired (in shares) | 0 | 0 |
Outstanding (in shares) | 105,556 | 105,556 | 105,556
Outstanding, weighted average exercise price (in dollars per share) | $ 9.95 | $ 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 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 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + 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 No definition available. + 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 No definition available. + Details
Name: | us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant