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Note A - Basis of Presentation (Details Textual)	Sep. 27, 2020
COVID 19 [Member]
Percentage of Franchises Open	60.00%

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- Definition

The percentage of franchises open.

+ References

No definition available.

+ Details

Name:	nath_PercentageOfFranchisesOpen
Namespace Prefix:	nath_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=nath_Covid19Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: