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Note F - Accounts and Other Receivables, Net - Changes in Allowance for Doubtful Accounts (Details) (USD $)
 9 Months Ended 12 Months Ended
Dec. 28, 2014
Mar. 30, 2014
Beginning balance $ 433,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 130,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Bad debt expense 7,000us-gaap_ProvisionForDoubtfulAccounts 21,000us-gaap_ProvisionForDoubtfulAccounts
Charges to other accounts 0nath_UncollectibleMarketingFundContributions 320,000nath_UncollectibleMarketingFundContributions
Accounts written off (14,000)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (38,000)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Ending balance $ 426,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 433,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent