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Note 8 - Note Payable Under Paycheck Protection Program (Details Textual) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 02, 2020 | May 01, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Gain (Loss) on Extinguishment of Debt, Total |  |  | $ 0 | $ 509,000
Paycheck Protection Program CARES Act [Member] |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  | $ 506,413 |  |
Debt Instrument, Principle Amount Forgiven | $ 506,000 |  |  |
Debt Instrument, Interest Amount Forgiven | $ 3,000 |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  | $ 509,000

X
- Definition The interest amount of debt instrument forgiven during the period. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The principal amount of debt instrument forgiven during the period. + References No definition available. + Details
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Namespace Prefix: | bcda_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Details
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