XML 91 R78.htm IDEA: XBRL DOCUMENT
v3.22.1

Note 17 - Special Purpose Acquisition Company (Details Textual) |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 14, 2021 USD ($) $ / shares shares | Apr. 06, 2021 shares | Dec. 01, 2020 $ / shares shares | Nov. 16, 2020 USD ($) shares | Oct. 26, 2020 USD ($) $ / shares shares | Aug. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Aug. 01, 2021 USD ($) | Dec. 31, 2019 USD ($) $ / shares
Stock Issued During Period, Value, New Issues | $ |  |  |  |  |  |  |  | $ 62,850,213 | $ 59,549,751 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 9.95 | $ 9.95 | $ 9.95 |  | $ 9.95
Assets Held-in-trust, Current | $ |  |  |  |  |  |  | $ 138,716,226 | $ 138,760,121 | $ 138,716,226 |  |
Warrants and Rights Outstanding | $ |  |  |  |  |  |  | $ 1,868,341 | 1,982,342 | $ 1,868,341 |  | $ 1,170,616
Money Market Funds [Member] |  |  |  |  |  |  |  |  |  |  |
Assets Held-in-trust, Current | $ |  |  |  |  |  |  |  | 69,382,121 |  |  |
US Treasury Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Assets Held-in-trust, Current | $ |  |  |  |  |  |  |  | 69,378,000 |  |  |
Business Combination Agreement with SHG [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Implied Pro Forma Equity Market Value of the Combined Company at Closing | $ |  |  |  |  |  |  |  |  |  | $ 777,000,000 |
Payments to Acquire Businesses, Gross | $ | $ 55,000,000 |  |  |  |  |  |  |  |  |  |
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Maximum Value | $ | $ 45,000,000 |  |  |  |  |  |  |  |  |  |
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Price Per Share (in dollars per share) | $ / shares | $ 10 |  |  |  |  |  |  |  |  |  |
Yellowstone Acquisition Company Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  |  |  |  |  |  |  | $ 11,908,671 |  |  |
Common Class B [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  |  |  |  | 1,055,560 | 1,055,560 | 1,055,560 |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  |  |  |  | 26,175,555 | 28,642,801 | 26,175,555 |  |
Common Class A [Member] | Business Combination Agreement with SHG [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Additional Financing in Support of Transaction, Number of Shares into which the Additional Equity Investment Will Be Converted (in shares) | 5,500,000 |  |  |  |  |  |  |  |  |  |
Business Acquisition, Additional Financing in Support of Transaction, Shares into which the Additional Equity Investment Will Be Converted, Price Per Share (in dollars per share) | $ / shares | $ 10 |  |  |  |  |  |  |  |  |  |
Common Class A [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 345,000 |  |  |  |  |  |  |  |  |
Yellowstone Acquisition Company [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance Initial Public Offering | $ |  |  |  |  | $ 125,000,000 |  |  |  |  |  |
Yellowstone Acquisition Company [Member] | Private Placement Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Warrants Called by Each Unit (in shares) |  |  |  |  | 0.5 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  |  | 1 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  | $ 11.50 |  |  |  |  |  |
Yellowstone Acquisition Company [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Units Issued (in shares) |  |  |  |  | 12,500,000 |  |  |  |  |  |
Sale of Unit, Price Per Unit (in dollars per share) | $ / shares |  |  |  |  | $ 10.00 |  |  |  |  |  |
Yellowstone Acquisition Company [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Number (in shares) |  |  | 1,098,898 |  |  |  |  |  |  |  |
Yellowstone Acquisition Company [Member] | BOC Yellowstone LLC [Member] | Private Placement Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 11.50 |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 219,779 |  | 7,500,000 |  |  |  |  |  |
Price of Warrant (in dollars per share) | $ / shares |  |  | $ 1.00 |  | $ 1.00 |  |  |  |  |  |
Proceeds from Issuance of Warrants | $ |  |  |  |  | $ 7,500,000 |  |  |  |  |  |
Yellowstone Acquisition Company [Member] | Common Class B [Member] | BOC Yellowstone LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 5,750,000 |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.0001 |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ |  |  |  |  |  | $ 25,000 |  |  |  |  |
Common stock, Shares Surrendered (in shares) |  |  |  |  |  |  | 2,350,276 |  |  |  |
Common Stock, Shares, Outstanding, Ending Balance (in shares) |  |  |  |  |  |  | 3,399,724 | 3,399,724 | 3,399,724 |  |
Common Stock, Conversion Rate |  |  |  |  |  |  |  | 1 |  |  |
Yellowstone Acquisition Company [Member] | Common Class A [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 13,598,898 |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 0.0001 |  |  |  |  |  |
Number of Securities Called by Each Unit (in shares) |  |  |  |  | 1 |  |  |  |  |  |
BOC Yellowstone LLC [Member] | BOC Yellowstone II LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Equity Method Investments | $ |  |  |  | $ 309,375 |  |  |  |  |  |  |
BOC Yellowstone LLC [Member] | BOC Yellowstone II LLC [Member] | Class B Common Stock of Yellowstone Acquisition Company [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Investee's Shares Transferred to Related Party for No Consideration (in shares) |  |  |  | 206,250 |  |  |  |  |  |  |
BOC Yellowstone LLC [Member] | Lead Investor in Yellowstone’s IPO [Member] |  |  |  |  |  |  |  |  |  |  |
Number of Investee's Shares Agreed to Transfer Upon Business Combination (in shares) |  |  |  | 206,250 |  |  |  |  |  |  |

X
- Definition With regard to the additional financing agreed to provide in support of the transaction, which will be funded prior to the closing of the business combination (if certain conditions are met), this element represents the number of shares into which the additional equity investment will be converted. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionAdditionalFinancingInSupportOfTransactionNumberOfSharesIntoWhichTheAdditionalEquityInvestmentWillBeConverted
Namespace Prefix: | bomn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition With regard to the additional financing agreed to provide in support of the transaction, which will be funded prior to the closing of the business combination (if certain conditions are met), this element represents the price per share of the shares into which the additional equity investment will be converted. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionAdditionalFinancingInSupportOfTransactionSharesIntoWhichTheAdditionalEquityInvestmentWillBeConvertedPricePerShare
Namespace Prefix: | bomn_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the maximum value of the backstop agreed to be provided to the acquiree in a business combination. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionBackstopAgreedToBeProvidedToAcquireeMaximumValue
Namespace Prefix: | bomn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the price per share of the backstop agreed to be provided to the acquiree in a business combination. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionBackstopAgreedToBeProvidedToAcquireePricePerShare
Namespace Prefix: | bomn_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the implied pro forma equity market value of the combined company at the closing of a business acquisition. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionImpliedProFormaEquityMarketValueOfTheCombinedCompanyAtClosing
Namespace Prefix: | bomn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The conversion rate of common stock. + References No definition available. + Details
Name: | bomn_CommonStockConversionRate
Namespace Prefix: | bomn_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares surrendered of common stock. + References No definition available. + Details
Name: | bomn_CommonStockSharesSurrendered
Namespace Prefix: | bomn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of investee's share would be transferred to counter party upon the completion of any business combination. + References No definition available. + Details
Name: | bomn_NumberOfInvesteesSharesAgreedToTransferUponBusinessCombination
Namespace Prefix: | bomn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of investee's shares were transferred to a related party for no consideration. + References No definition available. + Details
Name: | bomn_NumberOfInvesteesSharesTransferredToRelatedPartyForNoConsideration
Namespace Prefix: | bomn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of securities into which each unit may be converted. + References No definition available. + Details
Name: | bomn_NumberOfSecuritiesCalledByEachUnit
Namespace Prefix: | bomn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of units issued including both stock and warrants. + References No definition available. + Details
Name: | bomn_NumberOfUnitsIssued
Namespace Prefix: | bomn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of warrants called by each unit. + References No definition available. + Details
Name: | bomn_NumberOfWarrantsCalledByEachUnit
Namespace Prefix: | bomn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The per share price of warrant. + References No definition available. + Details
Name: | bomn_PriceOfWarrant
Namespace Prefix: | bomn_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Per unit amount received by subsidiary or equity investee for each unit issued or sold in the stock transaction. + References No definition available. + Details
Name: | bomn_SaleOfUnitPricePerUnit
Namespace Prefix: | bomn_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of units issued during the period + References No definition available. + Details
Name: | bomn_UnitsIssuedDuringPeriodNumber
Namespace Prefix: | bomn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate within one year of the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(b)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_AssetsHeldInTrustCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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=123467817&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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=123467817&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from entity's first offering of stock to the public. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceInitialPublicOffering
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodValueNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bomn_BusinessCombinationAgreementWithSHGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=bomn_YellowstoneAcquisitionCompanyWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=bomn_YellowstoneAcquisitionCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=bomn_PrivatePlacementWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=bomn_BOCYellowstoneLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=bomn_BOCYellowstoneLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis=bomn_BOCYellowstoneIILLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bomn_BOCYellowstoneIILLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=bomn_ClassBCommonStockOfYellowstoneAcquisitionCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=bomn_LeadInvestorInYellowstonesIPOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |