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Note 24 - Subsequent Events (Details) (Subsequent Event [Member], 2015 Share Repurchase Program [Member], USD $)
In Millions, unless otherwise specified
Mar. 13, 2015
Subsequent Event [Member] | 2015 Share Repurchase Program [Member]
  
Note 24 - Subsequent Events (Details) [Line Items]  
Stock Repurchase Program, Authorized Amount $ 1us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_ShareRepurchaseProgramAxis
= bsf_ShareRepurchaseProgram2015Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember