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Note 7 - Stockholders' Equity (Details Textual) - ATM [Member] - USD ($) $ in Millions	Mar. 31, 2026	Dec. 05, 2023
Accrued Sales Commission, Current, Percentage		3.00%
Sale of Stock, Available Value	$ 5.1

X

- Definition

Represents the current accrued sales commission's percentage.

+ References

No definition available.

+ Details

Name:	bcda_AccruedSalesCommissionCurrentPercentage
Namespace Prefix:	bcda_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents value of common stock available to sale under purchase agreement at period end.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=bcda_ATMMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: