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Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Note 5 - Loans Receivable (Details) - Loans Restructured as TDRs [Line Items]    
Troubled debt restructurings, number of loans 0us-gaap_FinancingReceivableModificationsNumberOfContracts2 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
Troubled debt restructurings, balance prior to TDR   $ 114us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Troubled debt restructurings, balance   111us-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]
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
Troubled debt restructurings, balance prior to TDR   103us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_OneToFourFamilyResidentialMember
Troubled debt restructurings, balance   100us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= bsf_OneToFourFamilyResidentialMember
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   11us-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]
[1] Concessions represent skipped payments/maturity date extensions or amortization term extensions.