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Note 8 - Stockholders' Equity - Warrants (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023 $ / shares shares
Balance, December 31, 2021 (in shares) | shares | 2,424,724
Balance, December 31, 2021 (in dollars per share) | $ / shares | $ 6.36
Warrants for common stock sold (in shares) | shares | (296,295)
Warrants for common stock sold (in dollars per share) | $ / shares | $ 6.75
Balance, December 31, 2022 (in shares) | shares | 2,128,429
Balance, December 31, 2022 (in dollars per share) | $ / shares | $ 6.3

X
- Definition The number of warrants or rights issued during period. + References No definition available. + Details
Name: | bcda_ClassOfWarrantOrRightIssuedDuringPeriod
Namespace Prefix: | bcda_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price per share or per unit of warrants or rights issued during the period. + References No definition available. + Details
Name: | bcda_ClassOfWarrantOrRightIssuedDuringPeriodWeightedAverageExercisePrice
Namespace Prefix: | bcda_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant