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Note 7 (Details Textual) - Accounting Standards Update 2016-02 [Member] $ in Millions | Sep. 29, 2019 USD ($)
--- | ---
Lease, Right-of-Use Asset | $ 71
Lease, Liability | $ 72

X
- Definition Present value of lessee's discounted obligation for lease payments from both operating and finance lease. + References No definition available. + Details
Name: | jjsf_LeaseLiability
Namespace Prefix: | jjsf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating and finance lease. + References No definition available. + Details
Name: | jjsf_LeaseRightOfUseAsset
Namespace Prefix: | jjsf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |