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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: