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Equity Method Investments (Details) - Equity Method Investments (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Real Estate Contributed $ 3,190,628us-gaap_ContributionOfProperty $ 0us-gaap_ContributionOfProperty
Cash Contributed 37,488us-gaap_PaymentsToAcquireEquityMethodInvestments 0us-gaap_PaymentsToAcquireEquityMethodInvestments
Net Income – Rental Activity 44,715us-gaap_IncomeLossFromEquityMethodInvestments  
Net Income – Gain on Sale of Real Estate 1,100,726us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal  
Distributions from Net Rental Income (44,715)us-gaap_EquityMethodInvestmentDividendsOrDistributions  
Proceeds from Sale of Class B Interests (4,328,842)us-gaap_ProceedsFromSaleOfEquityMethodInvestments  
Equity Method Investments 0us-gaap_EquityMethodInvestments  
CM Lithia Springs DST    
Schedule of Equity Method Investments [Line Items]    
Real Estate Contributed 1,508,930us-gaap_ContributionOfProperty
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
 
Cash Contributed 12,169us-gaap_PaymentsToAcquireEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
 
Net Income – Rental Activity 32,965us-gaap_IncomeLossFromEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
 
Net Income – Gain on Sale of Real Estate 590,817us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
 
Distributions from Net Rental Income (32,965)us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
 
Proceeds from Sale of Class B Interests (2,111,916)us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
 
Equity Method Investments 0us-gaap_EquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_CMLithiaSpringsDSTMember
 
AEI Net Lease Portfolio DST    
Schedule of Equity Method Investments [Line Items]    
Real Estate Contributed 1,681,698us-gaap_ContributionOfProperty
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
 
Cash Contributed 25,319us-gaap_PaymentsToAcquireEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
 
Net Income – Rental Activity 11,750us-gaap_IncomeLossFromEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
 
Net Income – Gain on Sale of Real Estate 509,909us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
 
Distributions from Net Rental Income (11,750)us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
 
Proceeds from Sale of Class B Interests (2,216,926)us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember
 
Equity Method Investments $ 0us-gaap_EquityMethodInvestments
/ invest_InvestmentHoldingAxis
= aei21_AEINetLeasePortfolioDSTMember