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us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree Mizuho Bank, term loan SOUTH AFRICA Field Merchandiser Services NRS [Member] Service provided by NRS, an affiliate of the company. us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo Mizuho Bank, term loan Share-based compensation Share-based compensation Exercise of stock options (in shares) Exercise of stock options (in shares) Exercised/cancelled, covered shares (in shares) Exercise of stock options Exercise of stock options Office And Vehicle Rental MHT [Member] Services provided by MHT, an affiliate of the company. sgrp_PercentOfEligibleDomesticAccountsReceivableLessCertainReservesToCalculateBorrowingAvailability Percent Of Eligible Domestic Accounts Receivable Less Certain Reserves To Calculate Borrowing Availability Percent of eligible domestic accounts receivable less certain reserves to calculate borrowing availability. us-gaap_TreasuryStockValue Treasury stock, at cost 119,695 shares – December 31, 2015 and 121,663 shares – December 31, 2014 Purchase of treasury shares Purchase of treasury shares MEXICO Reissued treasury shares – RSUs us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent Deferred income taxes Consolidation, Variable Interest Entity, Policy [Policy Text Block] Consulting and Administrative Services (CON) [Member] Consulting and administrative services provided by the company's affiliate CON. CON [Member] CONAPAD which supplies administrative and operational consulting to SPAR Todopromo beginning in 2015. SPAR Todopromo [Member] SPAR Todopromo, a consolidated international subsidiary of the Company. Common stock, $.01 par value: Authorized shares – 47,000,000 Issued shares – 20,680,717 – December 31, 2015 and December 31, 2014 Mr. Juan F. Medina Domenzain [Member] Mr. Juan F. Medina Domenzain, officer and director of SPAR Todopromo and also majority shareholder of CONAPAD ("CON"). 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Cash and Cash Equivalents, Policy [Policy Text Block] Deferred tax assets: sgrp_OperatingLossCarryforwardsLimitationOnUseAmount Operating Loss Carryforwards Limitation on Use Amount The maximum extent to which the reporting entity can use its operating loss carryforwards on an annual basis. us-gaap_EffectiveIncomeTaxRateContinuingOperations Net (benefit) expense Purchase Agreement [Member] Represents the agreement under which parties entered to purchase certain business assets, fixed assets us-gaap_RepaymentsOfNotesPayable Payments on term debt sgrp_EffectiveIncomeTaxRateReconciliationStateTaxReserveReductionPercent Other Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state tax reserve reduction. sgrp_NumberOfMerchandisingSpecialists Number of Merchandising Specialists Number of available field merchandising specialists. us-gaap_OperatingLossCarryforwards Operating Loss Carryforwards sgrp_NumberOfNationalRegionalAndDistrictAdministrators Number of National, Regional, and District Administrators Number of full-time national, regional, and district administrators. Employees and a Director [Member] Represents the employees and a specific director. Reconciliation Of Long Lived Assets From Segments To Consolidated [Table Text Block] Information pertaining to the reconciliation of long lived assets from segments to consolidated. sgrp_AffiliatePurchasePriceOfCommonStockPercent Affiliate Purchase Price of Common Stock Percent Represents information about the purchase price of common stock for affiliate expressed as a percentage of its value. Assets and Merchandising Teams of Unilink [Member] The acquisition of certain business assets, fixed assets and merchandising teams of Unilink. us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance Change in valuation allowance sgrp_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockDiscountRate Share-based Compensation Arrangement by Share-based Payment Award Purchase Price of Common Stock Discount Rate Represents information about the discount for employee purchases of Common Stock. us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments Foreign tax rate differential ESP Plan [Member] Represents the ESP Plan. Shanghai Wedone Marketing Consulting Co. Ltd [Member] Name of the related party. Schedule of Debt [Table Text Block] CSP Plan [Member] Represents the CSP Plan. Prime Rate [Member] sgrp_TotalPurchasePrice Total Purchase Price In an acquisition, the total price of the acquired entity. Investor in Shanghai [Member] Local Investor in Shanghai who invested in Unilink. Year Two [Member] The second contingent payment. Year One [Member] The first contingent payment. us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch Federal Research and Development Credit sgrp_MinimumOperatingEarningsThatMustBeContributedByAcquiree Minimum Operating Earnings That Must Be Contributed By Acquiree The minimum amount of operating earnings that must be contributed by the acquiree in order for the company to pay a contingent liability. sgrp_ThresholdPercentageOfOperatingEarningsOverMinimumContribution Threshold Percentage Of Operating Earnings Over Minimum Contribution Represents information about the percentage amount that the Company has agreed to pay to the other party. us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential Return to provision sgrp_AnnualOperatingEarningsTrigger Annual Operating Earnings Trigger Represents the amount of annual operating earnings which if attained by the acquiree, the Company would pay. Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Variable Rate [Domain] Price Range 1 [Member] Represents the first price range. Variable Rate [Axis] Price Range 3 [Member] Represents the third price range. Price Range 2 [Member] Represents the second price range. us-gaap_BusinessCombinationContingentConsiderationLiability Business Combination, Contingent Consideration, Liability AOCI Attributable to Parent [Member] Related Party Transactions Disclosure [Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Statement [Line Items] Related Party [Axis] Related Party [Domain] Schedule of Related Party Transactions [Table Text Block] Net (payments) borrowing on lines of credit us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense Permanent differences Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Credit And Debt Facilities Unused Availability [Table Text Block] Credit and debt facilities unused availability table text block. Valuation and Qualifying Accounts Disclosure [Table Text Block] Tabular disclosure of a schedule of allowance and reserve accounts where the valuation and qualifying accounts are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. us-gaap_LeaseAndRentalExpense Operating Leases, Rent Expense Debt Disclosure [Text Block] us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate Provision for income taxes at federal statutory rate us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes State income taxes, net of federal benefit us-gaap_RepaymentsOfLongTermCapitalLeaseObligations Payments on capital lease obligations us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance Change in valuation allowance us-gaap_IncomeTaxReconciliationOtherAdjustments Foreign tax rate differential Field Merchandiser Services NDS Reklam [Member] Field merchandiser services provided by the company's affiliate NDS Reklam. Office And Vehicle Rental MPT [Member] Represents the office and vehicle rental service provided by affiliate. Field Management Services NDS Tanitim [Member] Field management services provided by the company's affiliate NDS Tanitim. sgrp_CommonStockForConversion Common Stock For Conversion Common stock for conversion. Vehicle Rental MCPT [Member] Vehicle rental service provided by the company's affiliate MCPT. Field Merchandiser Services SBS [Member] Net cost of field merchandiser services (SBS). us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity Unused Availability Domestic Field Management [Member] Domestic field management member. us-gaap_DefinedBenefitPlanContributionsByEmployer Defined Benefit Plan, Contributions by Employer us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity Equity Component [Domain] us-gaap_IncomeTaxReconciliationTaxCreditsResearch Federal Research and Development Credit Equity Components [Axis] Mr And Ms Yilmaz [Member] Related parties. us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Long-term debt us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential Return to provision us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes State income taxes, net of federal benefit Mr. Mason [Member] Represents Mr.Mason, an officer and director and a shareholder of Merhold Property Trust ("MPT"). Concentration Risk, Credit Risk, Policy [Policy Text Block] us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate Provision for income taxes at federal statutory rate Mr. Brian Mason Mr. Garry Bristow And Mr. Adrian Wingfield [Member] Related parties. Common Stock [Member] NDS [Member] Consolidated international subsidiary. Lease Arrangement With MCPT [Member] Represents lease arrangement with Merhold Cape Property Trust. Series A Preferred Stock [Member] Additional Paid-in Capital [Member] Cost Plus Fee [Member] The Cost Plus Fee percentage markup. Schedule Of Tax Reserves [Table Text Block] Schedule of tax reserves table text block. NRS [Member] National Retail Source, LLC. us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_IncomeTaxReconciliationNondeductibleExpense Permanent differences Treasury Stock [Member] Retained Earnings [Member] SBS And SAS [Member] The total of both SPAR Business and SPAR Administrative services. SAS [Member] SPAR Administrative Services, Inc. SBS [Member] SPAR Business Services, Inc. Noncontrolling Interest [Member] Line of Credit Facility, Lender [Domain] Lender Name [Axis]