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Note 9 - Stockholders' Equity - Warrants (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 $ / shares shares
Balance, beginning (in shares) | shares | 2,424,724
Balance, beginning, weighted average exercise price (in dollars per share) | $ / shares | $ 6.36
Warrants for common stock sold (in shares) | shares | 0
Warrants for common stock sold, weighted average exercise price (in dollars per share) | $ / shares | $ 0
Warrants for common stock exercised (in shares) | shares | 0
Warrants for common stock exercised, weighted average exercise price (in dollars per share) | $ / shares | $ 0
Balance, ending (in shares) | shares | 2,424,724
Balance, ending, weighted average exercise price (in dollars per share) | $ / shares | $ 6.36

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

X
- Definition The weighted average exercise price of warrants exercised during the period. + References No definition available. + Details
Name: | bcda_ClassOfWarrantOrRightExercisedDuringPeriodWeightedAverageExercisePrice
Namespace Prefix: | bcda_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
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