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Note 6 - Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accrued expenses	$ 36	$ 157
Accrued salaries and employee benefits	797	899
Accrued clinical trial costs	1,032	548
Grant liability	491	534
Customer deposits	90	90
Total	2,502	2,246
Related Party [Member]
Payable to related party	$ 56	$ 18

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

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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

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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

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Namespace Prefix:	bcda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The amount of customer deposit liabilities classified as current.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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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://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481372/852-10-55-10

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