Note K - Economic Dependency - Substantial Net Purchase From Certain Suppliers (Details) - Supplier Concentration Risk [Member] - Raw Material Purchases [Member] - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2022	Jun. 30, 2021
Raw Material Purchases by Supplier	$ 14,065	$ 23,033
% of Total Raw Material Purchases	17.00%	24.00%
Supplier 1 [Member]
Raw Material Purchases by Supplier	$ 14,065	$ 23,033
% of Total Raw Material Purchases	17.00%	24.00%

Percentage of raw materials purchased from supplier

No definition available.

Name:	naii_PercentageOfRawMaterialsPurchasedFromSupplier
Namespace Prefix:	naii_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration