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Senior Convertible Debentures (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 01, 2009
Debt Instrument [Line Items]      
Senior Convertible Debentures 6,084,000us-gaap_SeniorNotes $ 6,084,000us-gaap_SeniorNotes  
Senior Convertible Debt [Member] | Senior Convertible Debentures issued December 1, 2009 [Member]      
Debt Instrument [Line Items]      
Senior Convertible Debentures     $ 6,100,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= sfdl_SeniorConvertibleDebenturesIssuedDecember12009Member
/ us-gaap_LongtermDebtTypeAxis
= sfdl_SeniorConvertibleDebtMember
Interest rate per year     8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= sfdl_SeniorConvertibleDebenturesIssuedDecember12009Member
/ us-gaap_LongtermDebtTypeAxis
= sfdl_SeniorConvertibleDebtMember
Debt Instrument, Convertible, Conversion Price     $ 20us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtInstrumentAxis
= sfdl_SeniorConvertibleDebenturesIssuedDecember12009Member
/ us-gaap_LongtermDebtTypeAxis
= sfdl_SeniorConvertibleDebtMember
Debt Instrument, Redemption Price, Percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= sfdl_SeniorConvertibleDebenturesIssuedDecember12009Member
/ us-gaap_LongtermDebtTypeAxis
= sfdl_SeniorConvertibleDebtMember