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PREPAYMENTS - THIRD PARTIES - Movement of allowance for doubtful accounts (Details) - Non-related party - USD ($)	6 Months Ended
	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

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Namespace Prefix:	baos_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in allowance for credit loss on prepaid expenses through foreign exchange gain (loss).

+ References

No definition available.

+ Details

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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

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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

X

- Details

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