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Note J - Treasury Stock (Details Textual) - USD ($) $ in Millions | Mar. 12, 2021 | Sep. 19, 2020 | Sep. 18, 2020
--- | --- | --- | ---
Stock Repurchase Program, Authorized Amount | $ 15 | $ 12 | $ 2
Stock Repurchase Program, Additional Authorized Amount | $ 3 |  |

X
- Definition Additional amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | naii_StockRepurchaseProgramAdditionalAuthorizedAmount
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant