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ORGANIZATION (Details Textual) (USD $)
1 Months Ended 12 Months Ended
Aug. 31, 1999
Apr. 30, 1998
Apr. 30, 1996
Mar. 31, 2004
Mar. 31, 2003
Mar. 31, 2002
Mar. 31, 2001
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 1993
Organization, Consolidation And Presentation Of Financial Statements [Line Items]                    
Limited Partners' Capital Account, Units Authorized               101,500,000us-gaap_LimitedPartnersCapitalAccountUnitsAuthorized 101,500,000us-gaap_LimitedPartnersCapitalAccountUnitsAuthorized 30,000,000us-gaap_LimitedPartnersCapitalAccountUnitsAuthorized
Limited Partners Capital Account Per Units                   $ 10bctciv_LimitedPartnersCapitalAccountPerUnits
Limited Partners Capital Account Additional Units Registered For Sale 8,000,000bctciv_LimitedPartnersCapitalAccountAdditionalUnitsRegisteredForSale 25,000,000bctciv_LimitedPartnersCapitalAccountAdditionalUnitsRegisteredForSale 10,000,000bctciv_LimitedPartnersCapitalAccountAdditionalUnitsRegisteredForSale 7,000,000bctciv_LimitedPartnersCapitalAccountAdditionalUnitsRegisteredForSale 7,000,000bctciv_LimitedPartnersCapitalAccountAdditionalUnitsRegisteredForSale 7,000,000bctciv_LimitedPartnersCapitalAccountAdditionalUnitsRegisteredForSale 7,500,000bctciv_LimitedPartnersCapitalAccountAdditionalUnitsRegisteredForSale