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Note 13 - Stock Based Compensation (Details) - Stock Option Activity (2011 Omnibus Incentive Plan [Member], USD $)
Mar. 31, 2015
Dec. 31, 2014
2011 Omnibus Incentive Plan [Member]
   
Note 13 - Stock Based Compensation (Details) - Stock Option Activity [Line Items]    
Outstanding— shares underlying awards 234,002us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= bsf_TwoThousandElevenOmnibusIncentivePlanMember
234,002us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= bsf_TwoThousandElevenOmnibusIncentivePlanMember
Outstanding— weighted average exercise price $ 6.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= bsf_TwoThousandElevenOmnibusIncentivePlanMember
$ 6.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= bsf_TwoThousandElevenOmnibusIncentivePlanMember
Exercisable—March 31, 2015 111,646us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_PlanNameAxis
= bsf_TwoThousandElevenOmnibusIncentivePlanMember
 
Exercisable—March 31, 2015 $ 6.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= bsf_TwoThousandElevenOmnibusIncentivePlanMember
 
Outstanding— shares underlying awards 234,002us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= bsf_TwoThousandElevenOmnibusIncentivePlanMember
234,002us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= bsf_TwoThousandElevenOmnibusIncentivePlanMember
Outstanding— weighted average exercise price $ 6.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= bsf_TwoThousandElevenOmnibusIncentivePlanMember
$ 6.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= bsf_TwoThousandElevenOmnibusIncentivePlanMember