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Discontinued Operations (Details) (USD $)
0 Months Ended
Aug. 02, 2013
Aug. 23, 2013
Dec. 31, 2013
Scott White College Station TX      
Discontinued Operations (Details) [Line Items]      
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds $ 1,822,494us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= aei21_ScottWhiteCollegeStationTXMember
   
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax 512,842us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= aei21_ScottWhiteCollegeStationTXMember
   
SEC Schedule III, Real Estate, Cost of Real Estate Sold 1,433,468us-gaap_RealEstateCostOfRealEstateSold
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= aei21_ScottWhiteCollegeStationTXMember
   
SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold 123,816us-gaap_RealEstateAccumulatedDepreciationRealEstateSold
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= aei21_ScottWhiteCollegeStationTXMember
   
Applebees Johnstown PA      
Discontinued Operations (Details) [Line Items]      
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds   1,958,905us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= aei21_ApplebeesJohnstownPAMember
 
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax   615,907us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= aei21_ApplebeesJohnstownPAMember
 
SEC Schedule III, Real Estate, Cost of Real Estate Sold   1,682,887us-gaap_RealEstateCostOfRealEstateSold
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= aei21_ApplebeesJohnstownPAMember
 
SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold   339,889us-gaap_RealEstateAccumulatedDepreciationRealEstateSold
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= aei21_ApplebeesJohnstownPAMember
 
CarMax Auto Superstore Lithia Springs GA      
Discontinued Operations (Details) [Line Items]      
Real Estate Held-for-sale     $ 1,508,930us-gaap_RealEstateHeldforsale
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= aei21_CarMaxAutoSuperstoreLithiaSpringsGAMember