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v3.20.1

Note G - Property and Equipment, Net (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 29, 2020 | Mar. 31, 2019
Property Depreciation and Amortization | $ 1,149 | $ 1,212

X
- Definition The amount of depreciation and amortization associated with property. + References No definition available. + Details
Name: | nath_PropertyDepreciationAndAmortization
Namespace Prefix: | nath_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration