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Note 12 - Capital Stock - Summary of Warrant Activity (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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) | 5 years 182 days | 6 years 182 days | 7 years 182 days
Outstanding, aggregate intrinsic value of vested warrants | $ 1,170,616 | $ 1,419,728 | $ 2,368,677
Issued (in shares) |  |  |
Exercised (in shares) |  |  |
Expired (in shares) |  |  |
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
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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
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Namespace Prefix: | bomn_
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X
- Definition The number of warrants or rights issued during period. + References No definition available. + Details
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Namespace Prefix: | bomn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
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X
- Definition The remaining term of certain warrants or rights. + References No definition available. + Details
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Namespace Prefix: | bomn_
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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
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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
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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
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