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Consolidated Statements of Stockholders' Equity (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Issuance costs $ 542us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Stock dividend (in Shares) 9bsf_CommonStockDividendsAdditionalSharesIssued
Common Stock [Member]  
Stock dividend 1bsf_CommonStockDividendsAddtionalShareConversionRatio
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Additional Paid-in Capital [Member]  
Issuance costs $ 542us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember