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Note 6 - Loans Held for Investment (Details) - Mortgage and Lease Receivable Credit Exposure by Assigned Risk Grade (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Residential Real Estate Loans [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade $ 62,629us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialRealEstateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 $ 61,779us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialRealEstateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Residential Real Estate Loans [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade 677us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialRealEstateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 684us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialRealEstateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Residential Real Estate Loans [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade 1,668us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialRealEstateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 2,095us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialRealEstateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Residential Real Estate Loans [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade   89us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialRealEstateLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Residential Real Estate Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade 64,974us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialRealEstateLoansMember		 64,647us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialRealEstateLoansMember
Residential Construction [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade 1,631us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,382us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Residential Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade 1,631us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialConstructionMember		 1,382us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialConstructionMember
Residential Lots and Raw Land [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade 798us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialLotsAndRawLandMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 817us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialLotsAndRawLandMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Residential Lots and Raw Land [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade 10us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialLotsAndRawLandMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 11us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialLotsAndRawLandMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Residential Lots and Raw Land [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade 808us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialLotsAndRawLandMember		 828us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_ResidentialLotsAndRawLandMember
Mortgage and Lease Receivables [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade 12,491us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_MortgageAndLeaseReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 12,323us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_MortgageAndLeaseReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Mortgage and Lease Receivables [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade 146us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_MortgageAndLeaseReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 69us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_MortgageAndLeaseReceivablesMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Mortgage and Lease Receivables [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage and lease receivable credit exposure by internally assigned grade $ 12,637us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_MortgageAndLeaseReceivablesMember		 $ 12,392us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fsbk_MortgageAndLeaseReceivablesMember