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Statements of Partners' Equity (USD $)
Total
Limited Partners [Member]
General Partner [Member]
Balance at Dec. 31, 2011 $ 2,103,075us-gaap_PartnersCapital $ 1,841,947us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
$ 261,128us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
Balance, Shares at Dec. 31, 2011   8,751us-gaap_PartnersCapitalAccountUnits
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
 
Net Income 634,162dtrpi_NetIncomeLossBeforeTax 627,821dtrpi_NetIncomeLossBeforeTax
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
6,341dtrpi_NetIncomeLossBeforeTax
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
Cash Distributions (645,142)us-gaap_PartnersCapitalAccountDistributions (638,691)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
(6,451)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
Balance at Dec. 31, 2012 2,092,095us-gaap_PartnersCapital 1,831,077us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
261,018us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
Balance, Shares at Dec. 31, 2012   8,751us-gaap_PartnersCapitalAccountUnits
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
 
Net Income 658,875dtrpi_NetIncomeLossBeforeTax 652,286dtrpi_NetIncomeLossBeforeTax
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
6,589dtrpi_NetIncomeLossBeforeTax
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
Cash Distributions (677,478)us-gaap_PartnersCapitalAccountDistributions (670,703)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
(6,775)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
Balance at Dec. 31, 2013 2,073,492us-gaap_PartnersCapital 1,812,660us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
260,832us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
Balance, Shares at Dec. 31, 2013   8,751us-gaap_PartnersCapitalAccountUnits
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
 
Net Income 677,526dtrpi_NetIncomeLossBeforeTax 670,751dtrpi_NetIncomeLossBeforeTax
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
6,775dtrpi_NetIncomeLossBeforeTax
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
Cash Distributions (708,399)us-gaap_PartnersCapitalAccountDistributions (701,315)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
(7,084)us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
Balance at Dec. 31, 2014 $ 2,042,619us-gaap_PartnersCapital $ 1,782,096us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember
$ 260,523us-gaap_PartnersCapital
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_GeneralPartnerMember
Balance, Shares at Dec. 31, 2014   8,751us-gaap_PartnersCapitalAccountUnits
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_LimitedPartnerMember