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Note 19 - Subsequent Events (Details Textual) - Subsequent Event [Member] - Business Combination Agreement with SHG [Member] $ / shares in Units, $ in Millions | Aug. 02, 2021 USD ($) $ / shares shares
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Business Acquisition, Implied Pro Forma Equity Market Value of the Combined Company at Closing | $ 777
Business Acquisition, Agreed Amount of Financing in Support of Transaction | 55
Business Acquisition, Financing in Support of Transaction, Minimum Bond Proceeds Required to Be Raised by Acquiree | 80
Business Acquisition, Additional Funding Expected to Be Raised By the Parties Involved Through a Private Placement Investment | 100
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Maximum Value | $ 45
Business Acquisition, Backstop Agreed to Be Provided to Acquiree, Price Per Share (in dollars per share) | $ / shares | $ 10
Business Acquisition, Minimum Investment Condition in Cash and Securities at Closing | $ 150
Business Acquisition, Gross Proceeds Expected to Be Received By the Combined Company | $ 238
Business Acquisition, Percentage of Equity in the Combined Company to Be Retained By the Acquiree's Equityholders | 100.00%
Business Acquisition, Private Activity Bond Proceeds Raised by Acquiree, Expected to Close in Fulfillment of Business Combination Requirements | $ 80
Common Class A [Member] |
Business Acquisition, Additional Financing in Support of Transaction, Number of Shares into which the Additional Equity Investment Will Be Converted (in shares) | 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

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 amount of additional funding expected to be raised by the parties involved through a private placement investment to be consummated at the closing of the business combination. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionAdditionalFundingExpectedToBeRaisedByThePartiesInvolvedThroughAPrivatePlacementInvestment
Namespace Prefix: | bomn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of financing agreed to provide in support of the transaction, which will be funded prior to the closing of the business combination, assuming the acquiree successfully raises at least the specified amount in a private activity bond offering. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionAgreedAmountOfFinancingInSupportOfTransaction
Namespace Prefix: | bomn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 With regard to the amount of financing agreed to provide in support of the transaction, which will be funded prior to the closing of the business combination, this element represents the minimum bond proceeds the acquiree must raise in order for the acquirer to provide financing support. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionFinancingInSupportOfTransactionMinimumBondProceedsRequiredToBeRaisedByAcquiree
Namespace Prefix: | bomn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the gross proceeds the combined company expects to receive in a business acquisition, excluding additional funds that may be raised through a private placement investment. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionGrossProceedsExpectedToBeReceivedByTheCombinedCompany
Namespace Prefix: | bomn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Represents the minimum investment condition in cash and securities at the closing of a business combination. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionMinimumInvestmentConditionInCashAndSecuritiesAtClosing
Namespace Prefix: | bomn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the percentage of equity in the combined company to be retained by the acquiree's equityholders. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionPercentageOfEquityInTheCombinedCompanyToBeRetainedByTheAcquireesEquityholders
Namespace Prefix: | bomn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of private activity bond proceeds raised by the acquiree and expected to close in the near future in fulfillment of the business combination requirements. + References No definition available. + Details
Name: | bomn_BusinessAcquisitionPrivateActivityBondProceedsRaisedByAcquireeExpectedToCloseInFulfillmentOfBusinessCombinationRequirements
Namespace Prefix: | bomn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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