Note J - Treasury Stock (Details Textual) $ in Millions	Dec. 02, 2022 USD ($)
Stock Repurchase Program, Additional Authorized Amount	$ 1
Stock Repurchase Program, Authorized Amount	$ 19

Additional amount of stock repurchase plan authorized.

No definition available.

Name:	naii_StockRepurchaseProgramAdditionalAuthorizedAmount
Namespace Prefix:	naii_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration