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Income Taxes (Details) - Federal Taxable Income Reconciliation (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Federal Taxable Income Reconciliation [Abstract]    
Net Income for Financial Reporting Purposes $ 1,533,587us-gaap_ProfitLoss $ 1,705,255us-gaap_ProfitLoss
Depreciation for Tax Purposes Under Depreciation and Amortization for Financial Reporting Purposes 129,852aei21_DepreciationForTaxPurposesUnderDepreciationForFinancialReportingPurposes 130,801aei21_DepreciationForTaxPurposesUnderDepreciationForFinancialReportingPurposes
Income Accrued for Tax Purposes Over (Under) Income for Financial Reporting Purposes 0aei21_IncomeAccruedForTaxPurposesUnderIncomeForFinancialReportingPurposes 1aei21_IncomeAccruedForTaxPurposesUnderIncomeForFinancialReportingPurposes
Acquisition Costs Expensed for Financial Reporting Purposes, Capitalized for Tax Purposes 62,022aei21_AcquisitionCostsExpensedForFinancialReportingPurposesCapitalizedForTaxPurposes 0aei21_AcquisitionCostsExpensedForFinancialReportingPurposesCapitalizedForTaxPurposes
Gain on Sale of Real Estate for Tax Purposes Over (Under) Gain for Financial Reporting Purposes (195,505)aei21_GainOnSaleOfRealEstateForTaxPurposesOverGainForFinancialReportingPurposes (179,700)aei21_GainOnSaleOfRealEstateForTaxPurposesOverGainForFinancialReportingPurposes
Taxable Income to Partners $ 1,529,956aei21_TaxableIncomeToPartners $ 1,656,357aei21_TaxableIncomeToPartners