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RELATED PARTY TRANSACTIONS (Details 1) (USD $)
9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]    
Fund management fees paid $ 2,644,058us-gaap_PaymentForManagementFee $ 5,524,494us-gaap_PaymentForManagementFee
Series Twenty [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 50,000us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyMember
189,402us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyMember
Series Twenty One [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 0us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyOneMember
79,000us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyOneMember
Series Twenty Two [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 142,116us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyTwoMember
90,375us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyTwoMember
Series Twenty Three [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 426,346us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyThreeMember
18,900us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyThreeMember
Series Twenty Four [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 50,049us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyFourMember
2,540,169us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyFourMember
Series Twenty Five [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 21,727us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyFiveMember
35,631us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyFiveMember
Series Twenty Six [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 120,863us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentySixMember
661,918us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentySixMember
Series Twenty Seven [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 168,894us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentySevenMember
364,802us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentySevenMember
Series Twenty Eight [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 847,453us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyEightMember
258,775us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyEightMember
Series Twenty Nine [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 0us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyNineMember
131,631us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyNineMember
Series Thirty One [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 604,556us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyOneMember
0us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyOneMember
Series Thirty Two [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 62,000us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyTwoMember
1,449us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyTwoMember
Series Thirty Four [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 50,000us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyFourMember
0us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyFourMember
Series Thirty Five [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 50,000us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyFiveMember
0us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyFiveMember
Series Thirty Six [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 50,054us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtySixMember
1,000,000us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtySixMember
Series Forty One [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 0us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyOneMember
52,000us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyOneMember
Series Forty Two [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid 0us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyTwoMember
50,000us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyTwoMember
Series Forty Five [Member]    
Related Party Transaction [Line Items]    
Fund management fees paid $ 0us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyFiveMember
$ 50,442us-gaap_PaymentForManagementFee
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyFiveMember