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Note 12 - Income Taxes (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Note 12 - Income Taxes (Details) [Line Items]      
Effective Income Tax Rate Reconciliation, Percent 28.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves $ 4,200,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves    
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Bad Debt Reserve for Tax Purposes of Qualified Lender 1,600,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityBadDebtReserveForTaxPurposesOfQualifiedLender   1,600,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityBadDebtReserveForTaxPurposesOfQualifiedLender
Domestic Tax Authority [Member] | PreOwnership [Member]      
Note 12 - Income Taxes (Details) [Line Items]      
Operating Loss Carryforwards 6,500,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_StatementScenarioAxis
= bsf_PreOwnershipMember		    
Domestic Tax Authority [Member] | Maximum [Member]      
Note 12 - Income Taxes (Details) [Line Items]      
Operating Loss Carryforwards 405,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Domestic Tax Authority [Member]      
Note 12 - Income Taxes (Details) [Line Items]      
Operating Loss Carryforwards 35,100,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
State and Local Jurisdiction [Member]      
Note 12 - Income Taxes (Details) [Line Items]      
Operating Loss Carryforwards $ 37,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember