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Note 11 (Details) - Held to Maturity Securities by Contractual Maturity (USD $)
In Thousands, unless otherwise specified
Sep. 27, 2014
Held to Maturity Securities by Contractual Maturity [Abstract]  
Due after five years through ten years $ 2,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount
Due after five years through ten years 1,987us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Total held to maturity securities 2,000us-gaap_HeldToMaturitySecurities
Total held to maturity securities 1,987us-gaap_HeldToMaturitySecuritiesFairValue
Long term held to maturity securities 2,000us-gaap_HeldToMaturitySecuritiesNoncurrent
Long term held to maturity securities $ 1,987jjsf_HeldToMaturitySecuritiesFairValueNonCurrent