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Members' Capital (Details)
6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
$ / item
shares
Jun. 30, 2017
USD ($)
$ / shares
$ / item
shares
Members' Capital (Details) [Line Items]    
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared $ 612,372 $ 615,553
SaleProceedsDistributionMadeToMemberOrLimitedPartner   70,707
Partners' Capital Account, Redemptions 75,023 75,539
Limited Member [Member]    
Members' Capital (Details) [Line Items]    
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared $ 594,001 $ 598,501
Distributions Per Limited Partnership Unit Outstanding, Basic (in Dollars per share) | $ / shares $ 25.17 $ 25.08
Weighted Average Limited Partnership Units Outstanding, Basic (in Shares) | shares 23,595 23,867
DistributionsPerUnitOfNetIncome (in Dollars per Item) | $ / item 10.69 9.80
DistributionsPerUnitOfReturnOfCapital (in Dollars per Item) | $ / item 14.48 15.28
SaleProceedsDistributionMadeToMemberOrLimitedPartner   $ 70,000
SaleProceedsDistributionMadeToLimitedPartnerPerUnit   $ 2.94
Partners' Capital Account, Units, Redeemed (in Shares) | shares 125.42 122.40
Partners' Capital Account, Redemptions $ 72,773 $ 73,273
Managing Member [Member]    
Members' Capital (Details) [Line Items]    
Distribution Made to Limited Liability Company (LLC) Member, Cash Distributions Declared 18,371 17,052
SaleProceedsDistributionMadeToMemberOrLimitedPartner   707
Partners' Capital Account, Redemptions $ 2,250 $ 2,266