Note 1 - Summary of Business and Basis of Presentation (Details Textual) - Merger [Member]	Oct. 24, 2016 shares
Business Combination, Percentage of Combined Company Owned By Acquirer Immediately After Merger	54.00%
Business Combination, Number of Shares of Post-merger Entity for Each Share of Pre-merger Entity	19.3678009

Represents the percentage of the combined company held by the acquirer (on a fully diluted basis) immediately following the closing of the merger transaction.

No definition available.

Name:	bcda_BusinessCombinationPercentageOfCombinedCompanyOwnedByAcquirerImmediatelyAfterMerger
Namespace Prefix:	bcda_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant