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Note 15 - Subsequent Event (Details Textual) - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Jul. 25, 2020 | Jun. 27, 2020
Cash, Cash Equivalents, and Marketable Securities |  | $ 270
Subsequent Event [Member] |  |
Decrease in Revenue from Contract with Customer, Percentage | 25.00% |

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

X
- Definition Represents decrease in revenue from contract with customer represented as percentage. + References No definition available. + Details
Name: | jjsf_DecreaseInRevenueFromContractWithCustomerPercentage
Namespace Prefix: | jjsf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |