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Note 11 - Related Party Transactions (Details Textual) - Funding Agreement [Member] - BSLF, L.L.C. [Member] - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 29, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Legal Fees	$ 688,000
Maximum Discount on Legal Service		$ 300,000
Litigation Service, Expense			$ 57,000	$ 14,000	$ 110,000	$ 61,000
Other Liabilities, Current			56,000		56,000		$ 18,000
Loss Contingency Accrual			$ 112,000		$ 112,000

X

- Definition

Represents litigation service, expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcda_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Maximum discount on legal service.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcda_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483076/450-20-50-1

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-Paragraph 10
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-URI https://asc.fasb.org//1943274/2147483076/450-20-50-10

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X

- 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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-Topic 210
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-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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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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