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INVESTMENTS IN OPERATING PARTNERSHIPS (Details 1) (USD $)
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Contributions Payable [Line Items]      
Capital contributions payable $ 619,106bctciv_CapitalContributionsPayable $ 664,260bctciv_CapitalContributionsPayable $ 664,260bctciv_CapitalContributionsPayable
Series Twenty Two [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 9,352bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyTwoMember
9,352bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyTwoMember
9,352bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyTwoMember
Series Twenty Six [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 1,127bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentySixMember
1,293bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentySixMember
1,293bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentySixMember
Series Twenty Seven [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 0bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentySevenMember
10,020bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentySevenMember
10,020bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentySevenMember
Series Twenty Eight [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 6,000bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyEightMember
40,968bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyEightMember
40,968bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyEightMember
Series Twenty Nine [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 8,235bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyNineMember
8,235bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyNineMember
8,235bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesTwentyNineMember
Series Thirty [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 127,396bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyMember
127,396bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyMember
127,396bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyMember
Series Thirty One [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 66,294bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyOneMember
66,294bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyOneMember
66,294bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyOneMember
Series Thirty Two [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 3,486bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyTwoMember
3,486bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyTwoMember
3,486bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyTwoMember
Series Thirty Three [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 69,154bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyThreeMember
69,154bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyThreeMember
69,154bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtyThreeMember
Series Thirty Seven [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 138,438bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtySevenMember
138,438bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtySevenMember
138,438bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesThirtySevenMember
Series Forty [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 102bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyMember
102bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyMember
102bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyMember
Series Forty One [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 100bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyOneMember
100bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyOneMember
100bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyOneMember
Series Forty Two [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 73,433bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyTwoMember
73,433bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyTwoMember
73,433bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyTwoMember
Series Forty Three [Member]      
Contributions Payable [Line Items]      
Capital contributions payable 99,265bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyThreeMember
99,265bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyThreeMember
99,265bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyThreeMember
Series Forty Five [Member]      
Contributions Payable [Line Items]      
Capital contributions payable $ 16,724bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyFiveMember
$ 16,724bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyFiveMember
$ 16,724bctciv_CapitalContributionsPayable
/ bctciv_TaxCreditSeriesAxis
= bctciv_SeriesFortyFiveMember