Note 14 - Grant Funding (Details Textual) - Grant Agreement [Member] - TEDCO [Member] - USD ($)	12 Months Ended
Dec. 31, 2022	Jun. 30, 2016
Grant Funding Available		$ 750,000
Proceeds from Grant Funding	$ 750,000
Research and Development Expense Reduction from Qualified Grant Funding	216,000
Deferred Revenue from Grants, Current	$ 534,000

Represents information pertaining to deferred revenue (or deferred expense reduction) from grant funding that has been received and is expected to be qualified for within one year or within the normal operating cycle (if longer).

No definition available.

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