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Note G - Economic Dependency (Details) - Substantial Net Purchase from Certain Supplier (Cost of Goods, Total [Member], Supplier Concentration Risk [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Concentration Risk [Line Items] |  |  |
Raw Material Purchases by Supplier | $ 1,952 |  | [1]
% of Total Raw Material Purchases | 21.00% |  | [1]
Supplier 1 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Raw Material Purchases by Supplier | 1,034 |  | [1]
% of Total Raw Material Purchases | 11.00% |  | [1]
Supplier 2 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Raw Material Purchases by Supplier | $ 918 |  | [1]
% of Total Raw Material Purchases | 10.00% |  | [1]
[1] | Purchases were less than 10% of the respective period's total raw material purchases.

X
- Definition Percentage of Raw Materials Purchased From Supplier + References No definition available. + Details
Name: | naii_PercentageOfRawMaterialsPurchasedFromSupplier
Namespace Prefix: | naii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Raw Material Purchases from Major Suppliers + 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_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration