XML 33 R36.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Note G - Economic Dependency - Substantial Net Purchase from Certain Supplier (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014
Raw material purchases by supplier | $ 810 naii_RawMaterialPurchasesBySupplier |  | [1] |  | [1] |  | [1]
% of total raw material purchases | 12.00%naii_PercentageOfRawMaterialsPurchasedFromSupplier |  | [1] |  | [1] |  | [1]
Supplier 1 [Member] | Raw Material Purchases [Member] | Supplier Concentration Risk [Member] |  |  |  |  |  |  |
Raw material purchases by supplier | $ 810 naii_RawMaterialPurchasesBySupplier / us-gaap_ConcentrationRiskByBenchmarkAxis = naii_RawMaterialPurchasesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis = naii_Supplier1Member |  | [1] |  | [1] |  | [1]
% of total raw material purchases | 12.00%naii_PercentageOfRawMaterialsPurchasedFromSupplier / us-gaap_ConcentrationRiskByBenchmarkAxis = naii_RawMaterialPurchasesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis = naii_Supplier1Member |  | [1] |  | [1] |  | [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 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_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis=naii_Supplier1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |