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Condensed Statements of Income (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
RENTAL REVENUES $ 117,878us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 109,722us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
EXPENSES:    
General and administrative 53,857us-gaap_GeneralAndAdministrativeExpense 36,967us-gaap_GeneralAndAdministrativeExpense
Depreciation 9,213us-gaap_Depreciation 9,213us-gaap_Depreciation
Total expenses 63,070us-gaap_OperatingExpenses 46,180us-gaap_OperatingExpenses
Operating income 54,808us-gaap_OperatingIncomeLoss 63,542us-gaap_OperatingIncomeLoss
OTHER INCOME:    
Interest 30us-gaap_InvestmentIncomeInterest 34us-gaap_InvestmentIncomeInterest
Other 975us-gaap_OtherNonoperatingIncome 75us-gaap_OtherNonoperatingIncome
Net income $ 55,813us-gaap_NetIncomeLoss $ 63,651us-gaap_NetIncomeLoss
Net income per limited partnership unit (Note 2) $ 0.33dtipiv_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicBeforeTax $ 0.38dtipiv_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicBeforeTax
Number of units used in computing per unit amounts 165,375us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding 165,375us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding