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Nature of Operations and Summary of Significant Accounting Policies, Revenue Recognition (Details)	12 Months Ended
	Dec. 31, 2023
Revenue Recognition [Abstract]
Maximum payment period received for transactions	90 days

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- Definition

Payment is typically received in the period the transactions occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	bsvn_PaymentPeriodForTransactionsOccur
Namespace Prefix:	bsvn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration