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Note 12 - Deferred Compensation (Details Textual) (USD $)
12 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 29, 2012
Deferred Compensation Arrangement with Individual, Compensation Expense $ 37,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense $ 94,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense $ 59,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Fair Value Inputs, Discount Rate 6.00%us-gaap_FairValueInputsDiscountRate 6.00%us-gaap_FairValueInputsDiscountRate 8.00%us-gaap_FairValueInputsDiscountRate
Per Year [Member] | Founder [Member]      
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount 114,000us-gaap_DeferredCompensationArrangementWithIndividualCashAwardGrantedAmount
/ us-gaap_StatementScenarioAxis
= span_PerYearMember
/ us-gaap_TitleOfIndividualAxis
= span_FounderMember
   
One-time Charge From Reduction In Disccount Rate [Member]      
Deferred Compensation Arrangement with Individual, Compensation Expense   $ 40,000us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= span_OneTimeChargeFromReductionInDisccountRateMember