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Note K - Economic Dependency - Substantial Net Purchase From Certain Suppliers (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Raw Material Purchases by Supplier	$ 12,004	$ 11,624
% of Total Raw Material Purchases	18.00%	23.00%
Supplier Concentration Risk [Member] | Raw Material Purchases [Member] | Supplier 1 [Member]
Raw Material Purchases by Supplier	$ 12,004	$ 11,624
% of Total Raw Material Purchases	18.00%	23.00%

X

- 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

X

- 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

X

- Details

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

X

- 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: