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Note 16 - Grant Funding (Details Textual) - Grant Agreement [Member] - TEDCO [Member] - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2018
Grant Funding Available | $ 750,000 |
Grant Funding, Term of Grant | 3 years |
Proceeds from Grant Funding |  | $ 750,000
Research and Development Expense Reduction from Qualified Grant Funding |  | 105,000
Deferred Revenue from Grants, Current |  | $ 645,000

X
- Definition 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). + References No definition available. + Details
Name: | bcda_DeferredRevenueFromGrantsCurrent
Namespace Prefix: | bcda_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount of grant funding available as of a certain date. + References No definition available. + Details
Name: | bcda_GrantFundingAvailable
Namespace Prefix: | bcda_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the term of the grant funding for a research project. + References No definition available. + Details
Name: | bcda_GrantFundingTermOfGrant
Namespace Prefix: | bcda_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of grant funding received during the period. + References No definition available. + Details
Name: | bcda_ProceedsFromGrantFunding
Namespace Prefix: | bcda_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of grant funding qualified during the period to reduce research & development expense. + References No definition available. + Details
Name: | bcda_ResearchAndDevelopmentExpenseReductionFromQualifiedGrantFunding
Namespace Prefix: | bcda_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=bcda_GrantAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=bcda_TEDCOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |