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Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2012	Dec. 31, 2014	Sep. 04, 2012
Related Party Transactions [Abstract]
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, maximum percentage	6.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, amount	$ 103,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 91,300us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Deferred compensation, employee contribution, percentage	2.00%bfs_DeferredCompensationArrangementWithIndividualContributionsByPlanParticipantsPercentageOfSalaryMaximum
Deferred compensation, company contribution, amount	31,200us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution	36,900us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Number of times the employer contribution is higher than the amount deferred by employees	300.00%bfs_DeferredCompensationArrangementwithIndividualEmployerContributionPercentagetoEmployeeDeferrals
Deferred compensation, cumulative unfunded liability	1,600,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability			1,800,000us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability
Ancillary costs and expenses	1,900,000bfs_AncillaryCostsAndExpenses	1,600,000bfs_AncillaryCostsAndExpenses
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses	431,900us-gaap_DueToRelatedPartiesCurrentAndNoncurrent			543,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
Extended lease expiration period			5 years
Percentage of annual increase in base rent			3.00%bfs_OperatingLeasesAnnualIncreaseInRentExpense
Rent expense	222,400us-gaap_OperatingLeasesRentExpenseNet	195,700us-gaap_OperatingLeasesRentExpenseNet
Insurance Commissions and fees expense	83,000us-gaap_OperatingInsuranceAndClaimsCostsProduction	85,900us-gaap_OperatingInsuranceAndClaimsCostsProduction
Monthly consulting fees					60,000bfs_MonthlyConsultingFees
Consulting fees		$ 180,000us-gaap_ProfessionalFees

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- Definition

Ancillary Costs and Expenses

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- Definition

Deferred Compensation Arrangement with Individual, Contributions by Plan Participants, Percentage of Salary, Maximum

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- Definition

Deferred Compensation Arrangement with Individual, Employer Contribution, Percentage to Employee Deferrals

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No definition available.

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- Definition

Monthly Consulting Fees

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- Definition

Operating Leases Annual Increase in Rent Expense

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Operating Leases, Extended Expiration Period

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- Definition

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

+ References

No definition available.

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- Definition

The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

-Paragraph 1

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.17)

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-Name Accounting Standards Codification

-Topic 850

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-Name Accounting Standards Codification

-Topic 235

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-Section S99

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Insurance and claims costs directly related to goods produced and sold, or services rendered, during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

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-Subparagraph (SX 210.6-07.2(a),(b),(c),(d))

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