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Note G - Economic Dependency - Substantial Net Purchase From Certain Suppliers (Details) - Supplier Concentration Risk [Member] - Raw Material Purchases [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Raw Material Purchases by Supplier | $ 2,778 |  |  |
% of Total Raw Material Purchases |  | 3961.00% | 5869.00% | 6793.00%
Supplier 1 [Member] |  |  |  |
Raw Material Purchases by Supplier | $ 2,778 | $ 3,961 | $ 5,869 | $ 6,793

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- Definition Percentage of raw materials purchased from supplier + References No definition available. + Details
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Namespace Prefix: | naii_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Raw material purchases by supplier + References No definition available. + Details
Name: | naii_RawMaterialPurchasesBySupplier
Namespace Prefix: | naii_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_SupplierConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=naii_RawMaterialPurchasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis=naii_Supplier1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |