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Real Estate Investments (Details) - Real Estate Held for Investment (USD $)
Dec. 31, 2014
Property, Plant and Equipment [Line Items]  
Land $ 3,484,216us-gaap_LandAndLandImprovements
Buildings 10,126,971us-gaap_InvestmentBuildingAndBuildingImprovements
Total 13,611,187us-gaap_RealEstateGrossAtCarryingValue
Accumulated Depreciation 2,650,190us-gaap_RealEstateOwnedAccumulatedDepreciation
KinderCare Andover MN  
Property, Plant and Equipment [Line Items]  
Land 179,755us-gaap_LandAndLandImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_KinderCareAndoverMNMember
Buildings 1,084,452us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_KinderCareAndoverMNMember
Total 1,264,207us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_KinderCareAndoverMNMember
Accumulated Depreciation 544,032us-gaap_RealEstateOwnedAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_KinderCareAndoverMNMember
Jared Jewelry Hanover MD  
Property, Plant and Equipment [Line Items]  
Land 861,065us-gaap_LandAndLandImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_JaredJewelryHanoverMDMember
Buildings 1,128,070us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_JaredJewelryHanoverMDMember
Total 1,989,135us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_JaredJewelryHanoverMDMember
Accumulated Depreciation 490,712us-gaap_RealEstateOwnedAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_JaredJewelryHanoverMDMember
Jared Jewelry Auburn Hills MI  
Property, Plant and Equipment [Line Items]  
Land 280,993us-gaap_LandAndLandImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_JaredJewelryAuburnHillsMIMember
Buildings 1,185,055us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_JaredJewelryAuburnHillsMIMember
Total 1,466,048us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_JaredJewelryAuburnHillsMIMember
Accumulated Depreciation 472,045us-gaap_RealEstateOwnedAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_JaredJewelryAuburnHillsMIMember
Best Buy Eau Claire WI  
Property, Plant and Equipment [Line Items]  
Land 853,357us-gaap_LandAndLandImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_BestBuyEauClaireWIMember
Buildings 2,784,349us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_BestBuyEauClaireWIMember
Total 3,637,706us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_BestBuyEauClaireWIMember
Accumulated Depreciation 770,337us-gaap_RealEstateOwnedAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_BestBuyEauClaireWIMember
Fresenius Medical Center Shreveport LA  
Property, Plant and Equipment [Line Items]  
Land 102,046us-gaap_LandAndLandImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_FreseniusMedicalCenterShreveportLAMember
Buildings 1,258,571us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_FreseniusMedicalCenterShreveportLAMember
Total 1,360,617us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_FreseniusMedicalCenterShreveportLAMember
Accumulated Depreciation 314,644us-gaap_RealEstateOwnedAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_FreseniusMedicalCenterShreveportLAMember
Tractor Supply Canton GA  
Property, Plant and Equipment [Line Items]  
Land 700,000us-gaap_LandAndLandImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_TractorSupplyCantonGAMember
Buildings 1,407,183us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_TractorSupplyCantonGAMember
Total 2,107,183us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_TractorSupplyCantonGAMember
Accumulated Depreciation 32,834us-gaap_RealEstateOwnedAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_TractorSupplyCantonGAMember
Gander Mountain Champaign IL  
Property, Plant and Equipment [Line Items]  
Land 507,000us-gaap_LandAndLandImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_GanderMountainChampaignILMember
Buildings 1,279,291us-gaap_InvestmentBuildingAndBuildingImprovements
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_GanderMountainChampaignILMember
Total 1,786,291us-gaap_RealEstateGrossAtCarryingValue
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_GanderMountainChampaignILMember
Accumulated Depreciation $ 25,586us-gaap_RealEstateOwnedAccumulatedDepreciation
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aei21_GanderMountainChampaignILMember