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v3.20.2

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