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Note S - Subsequent Event (Details Textual) $ in Millions	Sep. 26, 2020 USD ($)
Cash, Cash Equivalents, and Marketable Securities	$ 278

X

- Definition

Amount of cash, cash equivalents and marketable securities.

+ References

No definition available.

+ Details

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