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Note 11 - Revolving Credit Facility (Details Textual) (USD $)
12 Months Ended 1 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 29, 2012
Nov. 30, 2014
Dec. 31, 2012
Debt Disclosure [Abstract]          
Long-term Line of Credit $ 0us-gaap_LineOfCredit $ 0us-gaap_LineOfCredit      
Line of Credit Facility, Maximum Borrowing Capacity 10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity        
Line of Credit Facility, Interest Rate at Period End         1.0635%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage        
Line of Credit Facility Unused Borrowing Capacity Threshold 5,000,000span_LineOfCreditFacilityUnusedBorrowingCapacityThreshold        
Line of Credit Facility Dividend and Stock Repurchases Restrictions Percentage 50.00%span_LineOfCreditFacilityDividendAndStockRepurchasesRestrictionsPercentage        
Payments of Dividends 1,683,011us-gaap_PaymentsOfDividends 4,439,382us-gaap_PaymentsOfDividends 1,358,425us-gaap_PaymentsOfDividends    
Dividends Paid, Percentage of Net Income 65.00%span_DividendsPaidPercentageOfNetIncome        
Interest Expense $ 12,639us-gaap_InterestExpense $ 15,196us-gaap_InterestExpense $ 20,861us-gaap_InterestExpense    
Subsequent Event [Member]          
Debt Disclosure [Abstract]          
Common Stock, Dividends, Per Share, Cash Paid       $ 1us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Disclosure [Abstract]          
Debt Instrument, Basis Spread on Variable Rate 165.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Disclosure [Abstract]          
Debt Instrument, Basis Spread on Variable Rate 85.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember