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Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs [Line Items]    
Troubled debt restructurings, number of loans 3us-gaap_FinancingReceivableModificationsNumberOfContracts2 4us-gaap_FinancingReceivableModificationsNumberOfContracts2
Troubled debt restructurings, balance prior to TDR $ 199us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 $ 348us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Troubled debt restructurings, balance 189us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 333us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
One-to-Four-Family Residential [Member] | Modification of Payment Terms [Member]    
Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs [Line Items]    
Troubled debt restructurings, balance 103us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_OneToFourFamilyResidentialMember
/ bsf_ModificationTypeAxis
= bsf_ModificationOfPaymentTermsMember		 [1] 348us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_OneToFourFamilyResidentialMember
/ bsf_ModificationTypeAxis
= bsf_ModificationOfPaymentTermsMember		 [1]
One-to-Four-Family Residential [Member]    
Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs [Line Items]    
Troubled debt restructurings, number of loans 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_OneToFourFamilyResidentialMember		 4us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_OneToFourFamilyResidentialMember
Troubled debt restructurings, balance prior to TDR 103us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_OneToFourFamilyResidentialMember		 348us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_OneToFourFamilyResidentialMember
Troubled debt restructurings, balance 95us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_OneToFourFamilyResidentialMember		 333us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_OneToFourFamilyResidentialMember
Construction and Land Development [Member] | Other Modifications [Member]    
Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs [Line Items]    
Troubled debt restructurings, balance 85us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_ConstructionandLandDevelopmentMember
/ bsf_ModificationTypeAxis
= bsf_OtherModificationsMember		 [2]  
Construction and Land Development [Member]    
Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs [Line Items]    
Troubled debt restructurings, number of loans 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_ConstructionandLandDevelopmentMember		  
Troubled debt restructurings, balance prior to TDR 85us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_ConstructionandLandDevelopmentMember		  
Troubled debt restructurings, balance 84us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_ConstructionandLandDevelopmentMember		  
Consumer Loans [Member] | Modification of Payment Terms [Member]    
Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs [Line Items]    
Troubled debt restructurings, balance 11us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_ConsumerLoansMember
/ bsf_ModificationTypeAxis
= bsf_ModificationOfPaymentTermsMember		 [1]  
Consumer Loans [Member]    
Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs [Line Items]    
Troubled debt restructurings, number of loans 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_ConsumerLoansMember		  
Troubled debt restructurings, balance prior to TDR 11us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_ConsumerLoansMember		  
Troubled debt restructurings, balance 10us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_ConsumerLoansMember		  
Modification of Payment Terms [Member]    
Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs [Line Items]    
Troubled debt restructurings, balance 114us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ bsf_ModificationTypeAxis
= bsf_ModificationOfPaymentTermsMember		 [1] 348us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ bsf_ModificationTypeAxis
= bsf_ModificationOfPaymentTermsMember		 [1]
Other Modifications [Member]    
Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs [Line Items]    
Troubled debt restructurings, balance $ 85us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ bsf_ModificationTypeAxis
= bsf_OtherModificationsMember		 [2]  
[1] Concessions represent skipped payments/maturity date extensions or amortization term extensions.
[2] The borrower did not have the financial ability to refinance at another bank at renewal.