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Note 6 - Income per Share (Details) (Employee Stock Option [Member])
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Employee Stock Option [Member]
   
Note 6 - Income per Share (Details) [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 60,825us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
372,584us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember