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Note 22 - Related Party Transactions (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 22 - Related Party Transactions (Details) [Line Items]    
Due to Related Parties $ 11,500,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent $ 1,700,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
Debt Instrument, Unused Borrowing Capacity, Amount 2,500,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount  
Related Party Deposit Liabilities 13,700,000us-gaap_RelatedPartyDepositLiabilities 2,000,000us-gaap_RelatedPartyDepositLiabilities
Related Party Transaction, Expenses from Transactions with Related Party   72,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Property, Plant and Equipment, Net 50,332,000us-gaap_PropertyPlantAndEquipmentNet 18,769,000us-gaap_PropertyPlantAndEquipmentNet
Board of Directors Chairman [Member] | Air Transportation Equipment [Member] | Aircraft Purchase Agreement [Member]    
Note 22 - Related Party Transactions (Details) [Line Items]    
Property Plant and Equipment, Percentage Acquired 75.00%bsf_PropertyPlantAndEquipmentPercentageAcquired
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AirTransportationEquipmentMember
/ us-gaap_RelatedPartyTransactionAxis
= bsf_AircraftPurchaseAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BoardOfDirectorsChairmanMember
 
Property Plant and Equipment, Percentage Acquired by Related Party 25.00%bsf_PropertyPlantAndEquipmentPercentageAcquiredByRelatedParty
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AirTransportationEquipmentMember
/ us-gaap_RelatedPartyTransactionAxis
= bsf_AircraftPurchaseAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BoardOfDirectorsChairmanMember
 
Related Party Transaction, Amounts of Transaction 775,000us-gaap_RelatedPartyTransactionAmountsOfTransaction
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AirTransportationEquipmentMember
/ us-gaap_RelatedPartyTransactionAxis
= bsf_AircraftPurchaseAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BoardOfDirectorsChairmanMember
 
Air Transportation Equipment [Member]    
Note 22 - Related Party Transactions (Details) [Line Items]    
Property, Plant and Equipment, Net 583,000us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AirTransportationEquipmentMember
 
Related Parties [Member] | Line of Credit [Member]    
Note 22 - Related Party Transactions (Details) [Line Items]    
Debt Instrument, Unused Borrowing Capacity, Amount   3,100,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RelatedPartyTransactionAxis
= bsf_RelatedPartiesMember
Time Sharing Agreement [Member]    
Note 22 - Related Party Transactions (Details) [Line Items]    
Repayments of Related Party Debt $ 129,000us-gaap_RepaymentsOfRelatedPartyDebt
/ us-gaap_NatureOfExpenseAxis
= bsf_TimeSharingAgreementMember
$ 26,000us-gaap_RepaymentsOfRelatedPartyDebt
/ us-gaap_NatureOfExpenseAxis
= bsf_TimeSharingAgreementMember