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Equity Method Investments (Details) - Equity Method Investments (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]      
Real Estate Contributed (at carrying value) $ 0us-gaap_ContributionOfProperty $ 1,508,930us-gaap_ContributionOfProperty $ 1,681,698us-gaap_ContributionOfProperty
Cash Contributed 0us-gaap_PaymentsToAcquireEquityMethodInvestments 12,169us-gaap_PaymentsToAcquireEquityMethodInvestments 25,319us-gaap_PaymentsToAcquireEquityMethodInvestments
Net Income – Rental Activity   9,697us-gaap_IncomeLossFromEquityMethodInvestments 35,018us-gaap_IncomeLossFromEquityMethodInvestments
Net Income – Gain on Sale of Real Estate   23,167us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal 1,077,559us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
Equity Method Investments at March 31, 2014   1,553,963us-gaap_EquityMethodInvestmentAggregateCost 0us-gaap_EquityMethodInvestmentAggregateCost
CM Lithia Springs DST      
Schedule of Equity Method Investments [Line Items]      
Real Estate Contributed (at carrying value)   1,508,930us-gaap_ContributionOfProperty
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
0us-gaap_ContributionOfProperty
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
Cash Contributed   12,169us-gaap_PaymentsToAcquireEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
Net Income – Rental Activity   9,697us-gaap_IncomeLossFromEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
23,268us-gaap_IncomeLossFromEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
Net Income – Gain on Sale of Real Estate   23,167us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
567,650us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
Equity Method Investments at March 31, 2014   1,553,963us-gaap_EquityMethodInvestmentAggregateCost
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
0us-gaap_EquityMethodInvestmentAggregateCost
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
AEI Net Lease Portfolio DST      
Schedule of Equity Method Investments [Line Items]      
Real Estate Contributed (at carrying value)   0us-gaap_ContributionOfProperty
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
1,681,698us-gaap_ContributionOfProperty
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
Cash Contributed   0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
25,319us-gaap_PaymentsToAcquireEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
Net Income – Rental Activity   0us-gaap_IncomeLossFromEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
11,750us-gaap_IncomeLossFromEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
Net Income – Gain on Sale of Real Estate   0us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
509,909us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
Equity Method Investments at March 31, 2014   $ 0us-gaap_EquityMethodInvestmentAggregateCost
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
$ 0us-gaap_EquityMethodInvestmentAggregateCost
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember