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Note 6 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Accrued expenses	$ 52	$ 34
Accrued salaries and employee benefits	694	524
Accrued clinical trial costs	261	256
Grant liability	475	471
Customer deposits	64	64
Total	$ 1,546	$ 1,349

X

- Definition

Amount of accrued liabilities and liabilities classified as other, due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	bcda_AccruedLiabilitiesAndOtherLiabilitiesCurrent
Namespace Prefix:	bcda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided and employee benefits (due within one year or within the normal operating cycle if longer).

+ References

No definition available.

+ Details

Name:	bcda_AccruedSalariesAndEmployeeBenefitsCurrent
Namespace Prefix:	bcda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of obligations incurred for clinical trial costs, payable within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	bcda_AccuredClinicalTrialCosts
Namespace Prefix:	bcda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of customer deposit liabilities classified as current.

+ References

No definition available.

+ Details

Name:	bcda_CustomerDepositLiabilitiesCurrent
Namespace Prefix:	bcda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of obligations incurred for grants, payable within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	bcda_GrantLiabilityCurrent
Namespace Prefix:	bcda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_AccruedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant