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PREPAYMENTS - THIRD PARTIES - Movement of allowance for doubtful accounts (Details) - Non-related party - USD ($) | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
PREPAYMENTS - THIRD PARTIES |  |
Balance at beginning of the period/year | $ 612,546 | $ 581,462
Charge to expenses | (10,065) | 10,825
Foreign exchange adjustments | 11,478 | (13,463)
Balance at end of the period/year | $ 613,959 | $ 578,824

X
- Definition Amount of allowance for credit loss on prepaid expenses, classified as current. + References No definition available. + Details
Name: | baos_PrepaidExpensesAllowanceForCreditLossCurrent
Namespace Prefix: | baos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of increase (decrease) in allowance for credit loss on prepaid expenses through foreign exchange gain (loss). + References No definition available. + Details
Name: | baos_PrepaidExpensesAllowanceForCreditLossForeignExchangeGainLoss
Namespace Prefix: | baos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expense (reversal of expense) for expected credit loss on prepaid expenses. + References No definition available. + Details
Name: | baos_PrepaidExpensesCreditLossExpenseReversal
Namespace Prefix: | baos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | baos_PrepaidExpensesLineItems
Namespace Prefix: | baos_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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