Represents number of units in which convertible debt is converted to.

No definition available.

Name:	bcda_DebtConversionConvertedInstrumentUnits
Namespace Prefix:	bcda_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents number of common stock called by each unit.

+ References

No definition available.

+ Details

Name:	bcda_NumberOfCommonStockCalledByEachUnit
Namespace Prefix:	bcda_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Repressions number of common stock in each unit.

+ References

No definition available.

+ Details

Name:	bcda_NumberOfCommonStockInEachUnit
Namespace Prefix:	bcda_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents number of units offered to sale.

+ References

No definition available.

+ Details

Name:	bcda_NumberOfUnitsOfferedToSale
Namespace Prefix:	bcda_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents number of warrants in each unit.

+ References

No definition available.

+ Details

Name:	bcda_NumberOfWarrantsInEachUnit
Namespace Prefix:	bcda_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow from the additional capital contribution to the entity from issuance of common stock and warrants.

+ References

No definition available.

+ Details

Name:	bcda_ProceedsFromIssuanceOfCommonStockAndWarrants
Namespace Prefix:	bcda_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the issuance or sale of equity if over-allotment option is exercised in full by underwriters.

+ References

No definition available.

+ Details

Name:	bcda_ProceedsFromIssuanceOrSaleOfEquityIfOverAllotmentOptionIsExercised
Namespace Prefix:	bcda_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents additional common shares that underwriters are authorized to purchase to cover over –allotments if any.

+ References

No definition available.

+ Details

Name:	bcda_UnderwritersAdditionalCommonSharesAuthorizedToPurchase
Namespace Prefix:	bcda_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents additional warrants that underwriters are authorized to purchase to cover over –allotments if any.

+ References

No definition available.

+ Details

Name:	bcda_UnderwritersAdditionalWarrantsAuthorizedToPurchase
Namespace Prefix:	bcda_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the unit offering price.

+ References

No definition available.

+ Details

Name:	bcda_UnitOfferingPrice
Namespace Prefix:	bcda_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

+ Details

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfStockIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ 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=118932676&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromConvertibleDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

+ Details

Name:	us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_NonmonetaryTransactionTypeAxis=bcda_ReverseStockSplitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bcda_ConvertiblePromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=bcda_PublicOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=bcda_PrivatePlacementUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 8 - Stockholders' Equity (Details Textual)	Aug. 06, 2019 $ / shares shares	Aug. 02, 2019 USD ($) $ / shares shares	Jul. 05, 2019 USD ($)	Jun. 06, 2019	Dec. 24, 2018 USD ($) $ / shares shares	Jun. 30, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares
Common Stock, Par or Stated Value Per Share \| $ / shares						$ 0.001	$ 0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares					$ 6.75
Class of Warrant or Right, Number of Securities Called by Warrants or Rights					296,296
Common Stock, Shares, Issued, Total					592,592	4,847,471	4,845,697
Sale of Stock, Price Per Share \| $ / shares					$ 6.75
Proceeds from Issuance of Common Stock and Warrants \| $					$ 3,800,000
Payments of Stock Issuance Costs \| $					$ 200,000
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio				9
Subsequent Event [Member]
Common Stock, Par or Stated Value Per Share \| $ / shares		$ 0.001
Subsequent Event [Member] \| Convertible Promissory Note [Member]
Proceeds from Convertible Debt \| $			$ 625,000
Debt Instrument, Interest Rate, Stated Percentage			14.00%
Subsequent Event [Member] \| Public Offering [Member]
Number of Units Offered to Sale		1,666,667
Number of Common Stock in Each Unit		1
Common Stock, Par or Stated Value Per Share \| $ / shares		$ 0.001
Number of Common Stock Called by Each Unit		1
Unit Offering Price \| $ / shares		$ 6
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares		$ 6.30
Warrants and Rights Outstanding, Term		5 years
Underwriters, Additional Common Shares Authorized to Purchase		250,000
Underwriters, Additional Warrants Authorized to Purchase		250,000
Proceeds from Issuance or Sale of Equity, Total \| $		$ 8,760,000
Proceeds from Issuance or Sale of Equity if Over-allotment Option is Exercised \| $		$ 10,150,000
Number of Warrants in Each Unit		1
Subsequent Event [Member] \| Private Placement Unit [Member]
Number of Common Stock in Each Unit	1
Number of Common Stock Called by Each Unit	1
Debt Conversion, Converted Instrument, Units	210,887
Debt Instrument, Convertible, Conversion Price \| $ / shares	$ 3
Number of Warrants in Each Unit	1