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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

Present value of lessee's discounted obligation for lease payments from both operating and finance lease.

No definition available.

Name:	jjsf_LeaseLiability
Namespace Prefix:	jjsf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of lessee's right to use underlying asset under operating and finance lease.

No definition available.

Name:	jjsf_LeaseRightOfUseAsset
Namespace Prefix:	jjsf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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